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/F0 10/Courier-Bold@0 SF(Internet Engineering Task Force)72 85 Q
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(ution of per)-.22 E(-pack)-.22 E(et round-trip times can also af)-.11 E
(fect metrics of f)-.275 E(airness, de)-.11 E(gree of)-.165 E
(oscillations, and the lik)100.8 618.6 Q 2.75(e. F)-.11 F(or e)-.165 E
(xample, long-term oscillations of queueing delay are more)-.165 E(lik)
100.8 631.6 Q(ely to occur in scenarios with a narro)-.11 E 2.75(wr)
-.275 G(ange of round-trip times [FK02].)-2.75 E
(Measurements: The distrib)100.8 648.2 Q(ution of per)-.22 E(-pack)-.22
E(et round-trip times for TCP traf)-.11 E(\214c on a link can)-.275 E
(be measured from a pack)100.8 661.2 Q(et trace with the passi)-.11 E
.33 -.165(ve T)-.275 H(CP round-trip time estimator from Jiang).165 E
(and Do)100.8 674.2 Q(vrolis [JD02].)-.165 E
([Add pointers to other estimators, such as ones mentioned in JD02.)5.5
E(Add a pointer to Mark Allman')100.8 687.2 Q 2.75(sl)-.605 G
(oss detection tool.])-2.75 E(Their paper sho)5.5 E(ws the distrib)-.275
E(ution of)-.22 E(per)100.8 700.2 Q(-pack)-.22 E
(et round-trip times for TCP pack)-.11 E(ets for a number of dif)-.11 E
(ferent links.)-.275 E -.165(Fo)5.5 G 2.75(rt).165 G(he links)-2.75 E
(measured, the percent of pack)100.8 713.2 Q
(ets with round-trip times at most 100 ms ranged from 30% to)-.11 E(Flo)
72 769 Q(yd, K)-.11 E 281.729(ohler Section)-.385 F 2.75(4. [P)2.75 F
(age 3])-.165 E 0 Cg EP
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/F0 11/Times-Roman@0 SF(INTERNET)72 49 Q 74.337(-DRAFT Expires:)-1.012 F
(March 2006)2.75 E(September 2005)97.766 E(80%, and the percent of pack)
100.8 85 Q(ets with round-trip times at most 200 ms ranged from 55% to)
-.11 E(90%, depending on the link.)100.8 98 Q(In the NS simulator)100.8
114.6 Q 2.75(,t)-.44 G(he distrib)-2.75 E(ution of per)-.22 E(-pack)-.22
E(et round-trip times for TCP pack)-.11 E(ets on a)-.11 E
(link can be reported by the queue monitor)100.8 127.6 Q 2.75(,u)-.44 G
(sing TCP')-2.75 E 2.75(se)-.605 G(stimated round-trip time added to)
-2.75 E(pack)100.8 140.6 Q(et headers.)-.11 E
(This is illustrated in the v)5.5 E
(alidation test "./test-all-simple stats3" in the)-.275 E
(directory tcl/test.)100.8 153.6 Q(Scenarios: [FK02] sho)100.8 170.2 Q
(ws a relati)-.275 E -.165(ve)-.275 G
(ly simple scenario, with a dumbbell topology with four).165 E
(access links on each end, that gi)100.8 183.2 Q -.165(ve)-.275 G 2.75
(saf).165 G(airly realistic range of round-trip times.)-2.86 E
([Look for)5.5 E(the other citations to add.])100.8 196.2 Q/F1 11
/Times-Bold@0 SF(5.)72 222.2 Q/F2 14/Times-Bold@0 SF(Distrib)5.5 E
(ution of pack)-.28 E(et sequence numbers)-.14 E F0
(De\214nition: The distrib)100.8 238.8 Q(ution of pack)-.22 E
(et sequence numbers on a link is de\214ned by gi)-.11 E(ving each)-.275
E(pack)100.8 251.8 Q(et a sequence number)-.11 E 2.75(,w)-.44 G
(here the \214rst pack)-2.75 E
(et in a connection has sequence number 1,)-.11 E(the second pack)100.8
264.8 Q(et has sequence number 2, and so on.)-.11 E(The distrib)5.5 E
(ution of pack)-.22 E(et sequence)-.11 E(numbers can be deri)100.8 277.8
Q -.165(ve)-.275 G 2.75(di).165 G 2.75(nas)-2.75 G(traightforw)-2.75 E
(ard manner from the distrib)-.11 E(ution of connection)-.22 E
(sizes, and vice v)100.8 290.8 Q 2.75(ersa; ho)-.165 F(we)-.275 E -.165
(ve)-.275 G .88 -.44(r, t).165 H(he distrib).44 E
(ution of connection sizes is more suited for traf)-.22 E<8c63>-.275 E
(generators, and the distrib)100.8 303.8 Q(ution of pack)-.22 E
(et sequence numbers is more suited for measuring)-.11 E
(and illustrating the pack)100.8 316.8 Q(ets actually seen on a link o)
-.11 E -.165(ve)-.165 G 2.75(ra\214).165 G -.165(xe)-2.75 G 2.75(di).165
G(nterv)-2.75 E(al of time.)-.275 E(There has)5.5 E
(been a considerably body of research o)100.8 329.8 Q -.165(ve)-.165 G
2.75(rt).165 G(he last ten years on the hea)-2.75 E(vy-tailed distrib)
-.22 E(ution)-.22 E(of connection sizes for traf)100.8 342.8 Q
(\214c on the Internet.)-.275 E([CBC95] [Add citations.])5.5 E
(Determining f)100.8 359.4 Q(actors: The distrib)-.11 E
(ution of connection sizes is lar)-.22 E(gely determined by the)-.198 E
(traf)100.8 372.4 Q(\214c generators used in a scenario.)-.275 E -.165
(Fo)5.5 G 2.75(re).165 G(xample, is there a single traf)-2.915 E
(\214c generator)-.275 E(characterized by a distrib)100.8 385.4 Q
(ution of connection sizes?)-.22 E 2.75(Am)5.5 G(ix of long-li)-2.75 E
-.165(ve)-.275 G 2.75(da).165 G(nd web traf)-2.75 E(\214c,)-.275 E
(with the web traf)100.8 398.4 Q(\214c characterized by a distrib)-.275
E(ution of connection sizes?)-.22 E(Or something)5.5 E(else?)100.8 411.4
Q(Ef)100.8 428 Q(fect on congestion control metrics: The distrib)-.275 E
(ution of pack)-.22 E(et sequence numbers af)-.11 E(fects)-.275 E(the b)
100.8 441 Q(urstiness of aggre)-.22 E -.055(ga)-.165 G(te traf).055 E
(\214c on a link, thereby af)-.275 E
(fecting all congestion control metrics)-.275 E(for which this is a f)
100.8 454 Q(actor)-.11 E 5.5(.A)-.605 G 2.75(sa)-5.5 G 2.75(ne)-2.75 G
(xample, [FK02] illustrates that the traf)-2.915 E(\214c mix can af)
-.275 E(fect)-.275 E(the queue dynamics on a congested link.)100.8 467 Q
([Find more to cite, about the ef)5.5 E(fect of the)-.275 E(distrib)
100.8 480 Q(ution of pack)-.22 E
(et sequence numbers on congestion control metrics.])-.11 E
([Add a paragraph about the impact of medium-size \215o)100.8 496.6 Q
(ws.])-.275 E([Add a paragraph about the impact of \215o)100.8 513.2 Q
(ws starting and stopping.])-.275 E([Add a w)100.8 529.8 Q
(arning about scenarios that use only long-li)-.11 E -.165(ve)-.275 G
2.75<648d>.165 G -.275(ow)-2.75 G(s, or a mix of long-li).275 E -.165
(ve)-.275 G 2.75(da).165 G(nd)-2.75 E -.165(ve)100.8 542.8 S
(ry short \215o).165 E(ws.])-.275 E
(Measurements: [Cite some of the literature.])100.8 559.4 Q -.385(Tr)
100.8 576 S(af).385 E(\214c generators: Some of the a)-.275 E -.275(va)
-.22 G(ilable traf).275 E
(\214c generators are listed on the web site for)-.275 E("T)100.8 589 Q
(raf)-.385 E(\214c Generators for Internet T)-.275 E(raf)-.385 E
(\214c" [TG].)-.275 E(This includes pointers to traf)5.5 E
(\214c generators)-.275 E(for peer)100.8 602 Q(-to-peer traf)-.22 E
(\214c, traf)-.275 E(\214c from online g)-.275 E(ames, and traf)-.055 E
(\214c from Distrib)-.275 E(uted Denial of)-.22 E
(Service \(DDoS\) attacks.)100.8 615 Q(In the NS simulator)100.8 631.6 Q
2.75(,t)-.44 G(he distrib)-2.75 E(ution of pack)-.22 E
(et sequence numbers for TCP pack)-.11 E(ets on a link)-.11 E
(can be reported by the queue monitor at a router)100.8 644.6 Q 5.5(.T)
-.605 G(his is illustrated in the v)-5.5 E(alidation test)-.275 E
("./test-all-simple stats3" in the directory tcl/test.)100.8 657.6 Q F1
(6.)72 683.6 Q F2(The Distrib)5.5 E(ution of P)-.28 E(ack)-.14 E
(et Sizes)-.14 E F0(De\214nition: The distrib)100.8 700.2 Q
(ution of pack)-.22 E(et sizes is de\214ned in a straightforw)-.11 E
(ard w)-.11 E(ay)-.11 E 2.75(,u)-.715 G(sing)-2.75 E(pack)100.8 713.2 Q
(et sizes in bytes.)-.11 E(Flo)72 769 Q(yd, K)-.11 E 281.729
(ohler Section)-.385 F 2.75(6. [P)2.75 F(age 4])-.165 E 0 Cg EP
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/F0 11/Times-Roman@0 SF(INTERNET)72 49 Q 74.337(-DRAFT Expires:)-1.012 F
(March 2006)2.75 E(September 2005)97.766 E(Determining f)100.8 85 Q
(actors: The distrib)-.11 E(ution of pack)-.22 E
(et sizes is determined by the traf)-.11 E(\214c mix, the)-.275 E
(path MTUs, and by the pack)100.8 98 Q
(et sizes used by the transport-le)-.11 E -.165(ve)-.275 G 2.75(ls).165
G(enders.)-2.75 E(The distrib)100.8 114.6 Q(ution of pack)-.22 E
(et sizes on a link is also determined by the mix of forw)-.11 E
(ard-path)-.11 E(TCP traf)100.8 127.6 Q(\214c and re)-.275 E -.165(ve)
-.275 G(rse-path TCP traf).165 E
(\214c in that scenario, for a scenario characterized by a)-.275 E
(`forw)100.8 140.6 Q
(ard path' \(e.g., left to right on a particular link\) and a `re)-.11 E
-.165(ve)-.275 G(rse path' \(e.g., right to left).165 E
(on the same link\).)100.8 153.6 Q -.165(Fo)5.5 G 2.75(rs).165 G
(uch a scenario, the forw)-2.75 E(ard-path TCP traf)-.11 E
(\214c contrib)-.275 E(utes data)-.22 E(pack)100.8 166.6 Q
(ets to the forw)-.11 E(ard link and ackno)-.11 E(wledgment pack)-.275 E
(ets to the re)-.11 E -.165(ve)-.275 G(rse link, while the).165 E(re)
100.8 179.6 Q -.165(ve)-.275 G(rse-path TCP traf).165 E(\214c contrib)
-.275 E(utes small ackno)-.22 E(wledgment pack)-.275 E(ets to the forw)
-.11 E(ard link.)-.11 E(The ratio between TCP data and TCP A)100.8 192.6
Q(CK pack)-.44 E(ets on a link can be used as some)-.11 E
(indication of the ratio between forw)100.8 205.6 Q(ard-path and re)-.11
E -.165(ve)-.275 G(rse-path TCP traf).165 E(\214c.)-.275 E(Ef)100.8
222.2 Q(fect on congestion control metrics: The distrib)-.275 E
(ution of pack)-.22 E(et sizes on a link is an)-.11 E
(indicator of the ratio of forw)100.8 235.2 Q(ard-path and re)-.11 E
-.165(ve)-.275 G(rse-path TCP traf).165 E(\214c in that netw)-.275 E
2.75(ork. The)-.11 F(amount of re)100.8 248.2 Q -.165(ve)-.275 G
(rse-path traf).165 E(\214c determines the loss and queueing delay e)
-.275 E(xperienced by)-.165 E(ackno)100.8 261.2 Q(wledgement pack)-.275
E(ets on the re)-.11 E -.165(ve)-.275 G(rse path, signi\214cantly af)
.165 E(fecting the b)-.275 E(urstiness of the)-.22 E(aggre)100.8 274.2 Q
-.055(ga)-.165 G(te traf).055 E(\214c on the forw)-.275 E(ard path.)-.11
E([Add citations.])5.5 E([In what other w)5.5 E(ays does the)-.11 E
(distrib)100.8 287.2 Q(ution of pack)-.22 E(et sizes af)-.11 E
(fect congestion control metrics?])-.275 E
(Measurements: There has been a wealth of measurements o)100.8 303.8 Q
-.165(ve)-.165 G 2.75(rt).165 G(ime on the pack)-2.75 E(et size)-.11 E
(distrib)100.8 316.8 Q(ution of traf)-.22 E(\214c [A00], [HMTG01].)-.275
E(These measurements are generally consistent)5.5 E(with a model of rou\
ghly 10% of the TCP connections using an MSS of roughly 500 bytes,)100.8
329.8 Q
(and with the other 90% of TCP connections using an MSS of 1460 bytes.)
100.8 342.8 Q/F1 11/Times-Bold@0 SF(7.)72 368.8 Q/F2 14/Times-Bold@0 SF
(The Distrib)5.5 E(ution of P)-.28 E(er)-.28 E(-P)-.518 E(ack)-.14 E
(et P)-.14 E(eak Flo)-.28 E 3.5(wR)-.14 G(ates)-3.5 E F0
(De\214nition: The distrib)100.8 385.4 Q(ution of peak \215o)-.22 E 2.75
(wr)-.275 G(ates is de\214ned by assigning to each pack)-2.75 E(et the)
-.11 E(peak sending rate in bytes per second of that connection, where \
the peak sending rate is)100.8 398.4 Q(de\214ned o)100.8 411.4 Q -.165
(ve)-.165 G 2.75(r0).165 G(.1-second interv)-2.75 E 2.75(als. The)-.275
F(distrib)2.75 E(ution of peak \215o)-.22 E 2.75(wr)-.275 G(ates gi)
-2.75 E -.165(ve)-.275 G 2.75(ss).165 G(ome)-2.75 E
(indication of the ratio of "alpha" and "beta" traf)100.8 424.4 Q
(\214c on a link, where alpha traf)-.275 E(\214c on a)-.275 E
(congested link is de\214ned as traf)100.8 437.4 Q
(\214c with that link at the main bottleneck, while the beta)-.275 E
(traf)100.8 450.4 Q(\214c on the link has a primary bottleneck else)
-.275 E(where along its path [RSB01].)-.275 E(Determining f)100.8 467 Q
(actors: The distrib)-.11 E(ution of peak \215o)-.22 E 2.75(wr)-.275 G
(ates is determined by \215o)-2.75 E(ws with)-.275 E(bottlenecks else)
100.8 480 Q(where along their end-to-end path, e.g., \215o)-.275 E
(ws with lo)-.275 E(w-bandwidth access)-.275 E 2.75(links. The)100.8 493
R(distrib)2.75 E(ution of peak \215o)-.22 E 2.75(wr)-.275 G
(ates is also af)-2.75 E(fected by applications with limited)-.275 E
(sending rates.)100.8 506 Q(Ef)100.8 522.6 Q
(fect on congestion control metrics: The distrib)-.275 E
(ution of peak \215o)-.22 E 2.75(wr)-.275 G(ates af)-2.75 E(fects the)
-.275 E -.22(bu)100.8 535.6 S(rstiness of aggre).22 E -.055(ga)-.165 G
(te traf).055 E(\214c, with lo)-.275 E(w-peak-rate traf)-.275 E
(\214c decreasing the aggre)-.275 E -.055(ga)-.165 G(te).055 E -.22(bu)
100.8 548.6 S(rstiness, and adding to the traf).22 E(\214c')-.275 E 2.75
(st)-.605 G(ractability)-2.75 E(.)-.715 E(Measurements: [RSB01].)100.8
565.2 Q(The distrib)5.5 E(ution of peak rates can be e)-.22 E
(xpected to change o)-.165 E -.165(ve)-.165 G(r).165 E(time, as there i\
s an increasing number of high-bandwidth access links to the home, and \
of)100.8 578.2 Q(high-bandwidth Ethernet links at w)100.8 591.2 Q
(ork and at other institutions.)-.11 E(Simulators: [F)100.8 607.8 Q(or \
NS, add a pointer to the DelayBox, "http://dirt.cs.unc.edu/delaybox/", \
for)-.165 E(more easily simulating lo)100.8 620.8 Q
(w-bandwidth access links for \215o)-.275 E(ws.])-.275 E F1(8.)72 646.8
Q F2(The Distrib)5.5 E(ution of T)-.28 E(ransport Pr)-1.036 E(otocols.)
-.252 E F0(De\214nition: The distrib)100.8 663.4 Q
(ution of transport protocols on a congested link is straightforw)-.22 E
(ard,)-.11 E(with each pack)100.8 676.4 Q(et gi)-.11 E -.165(ve)-.275 G
2.75(ni).165 G(ts associated transport protocol \(e.g., TCP)-2.75 E 2.75
(,U)-1.221 G 2.75(DP\). The)-2.75 F(distrib)2.75 E(ution)-.22 E
(is often gi)100.8 689.4 Q -.165(ve)-.275 G 2.75(nb).165 G
(oth in terms of pack)-2.75 E(ets and in terms of bytes.)-.11 E -.165
(Fo)100.8 706 S 2.75(rU).165 G(DP pack)-2.75 E(ets, it might be more he\
lpful to classify them in terms of the port number)-.11 E 2.75(,o)-.44 G
(r)-2.75 E(the assumed application \(e.g., DNS, RIP)100.8 719 Q 2.75(,g)
-1.221 G(ames, W)-2.805 E(indo)-.44 E(ws Media, RealAudio, RealV)-.275 E
(ideo,)-.66 E(Flo)72 769 Q(yd, K)-.11 E 281.729(ohler Section)-.385 F
2.75(8. [P)2.75 F(age 5])-.165 E 0 Cg EP
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/F0 11/Times-Roman@0 SF(INTERNET)72 49 Q 74.337(-DRAFT Expires:)-1.012 F
(March 2006)2.75 E(September 2005)97.766 E 2.75(etc.\) [MA)100.8 85 R
2.75(WI]\). Other)-.99 F(traf)2.75 E(\214c includes ICMP)-.275 E 2.75
(,I)-1.221 G(PSEC, and the lik)-2.75 E 2.75(e. In)-.11 F
(the future there could)2.75 E(be traf)100.8 98 Q(\214c from SCTP)-.275
E 2.75(,D)-1.221 G(CCP)-2.75 E 2.75(,o)-1.221 G 2.75(rf)-2.75 G
(rom other transport protocols.)-2.75 E(Ef)100.8 114.6 Q
(fect on congestion control metrics: The distrib)-.275 E
(ution of transport protocols af)-.22 E(fects metrics)-.275 E
(relating to the ef)100.8 127.6 Q(fecti)-.275 E -.165(ve)-.275 G
(ness of A).165 E(QM mechanisms on a link.)-.605 E
(Measurements: In the past, TCP traf)100.8 144.2 Q
(\214c has typically consisted of 90% to 95% of the bytes)-.275 E
(on a link [UW02], [U)100.8 157.2 Q 2.75(A01]. [Get)-.44 F
(updated citations for this.])2.75 E(Measurement studies sho)5.5 E(w)
-.275 E(that TCP traf)100.8 170.2 Q(\214c from web serv)-.275 E
(ers almost al)-.165 E -.11(wa)-.11 G
(ys uses conformant TCP congestion control).11 E(procedures [MAF05].)
100.8 183.2 Q/F1 11/Times-Bold@0 SF(9.)72 209.2 Q/F2 14/Times-Bold@0 SF
(The Synchr)5.5 E(onization Ratio)-.252 E F0
(De\214nition: The synchronization ratio is de\214ned as the de)100.8
225.8 Q(gree of synchronization of loss)-.165 E -2.365 -.275(ev e)100.8
238.8 T(nts between tw).275 E 2.75(oT)-.11 G(CP \215o)-2.75 E
(ws on the same path.)-.275 E
(Thus, the synchronization ratio is de\214ned)5.5 E
(as a characteristic of an end-to-end path.)100.8 251.8 Q
(When one TCP \215o)5.5 E 2.75(wo)-.275 G 2.75(fap)-2.75 G
(air has a loss e)-2.75 E -.165(ve)-.275 G(nt, the).165 E
(synchronization ratio is gi)100.8 264.8 Q -.165(ve)-.275 G 2.75(nb).165
G 2.75(yt)-2.75 G(he fraction of those loss e)-2.75 E -.165(ve)-.275 G
(nts for which the second \215o).165 E(w)-.275 E(has a loss e)100.8
277.8 Q -.165(ve)-.275 G(nt within one round-trip time.).165 E
(Each connection in a \215o)5.5 E 2.75(wp)-.275 G(air has a separate)
-2.75 E(synchronization ratio, and the o)100.8 290.8 Q -.165(ve)-.165 G
(rall synchronization ratio of the pair of \215o).165 E
(ws is the higher)-.275 E(of the tw)100.8 303.8 Q 2.75(or)-.11 G 2.75
(atios. When)-2.75 F
(measuring the synchronization ratio, it is preferable to start the)2.75
E(tw)100.8 316.8 Q 2.75(oT)-.11 G(CP \215o)-2.75 E(ws at slightly dif)
-.275 E(ferent times, with lar)-.275 E(ge recei)-.198 E .33 -.165(ve w)
-.275 H(indo).165 E(ws.)-.275 E(Determining f)100.8 333.4 Q
(actors: The synchronization ratio is determined lar)-.11 E
(gely by the traf)-.198 E(\214c mix on)-.275 E
(the congested link, and by the A)100.8 346.4 Q
(QM mechanism \(or lack of A)-.605 E(QM mechanism\).)-.605 E(Dif)100.8
363 Q(ferent types of TCP \215o)-.275 E(ws are also lik)-.275 E
(ely to ha)-.11 E .33 -.165(ve d)-.22 H(if).165 E
(ferent synchronization measures.)-.275 E(E.g., T)100.8 376 Q .22 -.11
(wo H)-.88 H(ighSpeed TCP \215o).11 E(ws might ha)-.275 E .33 -.165
(ve h)-.22 H(igher synchronization measures that tw).165 E(o)-.11 E
(Standard TCP \215o)100.8 389 Q
(ws on the same path, because of their more aggressi)-.275 E .33 -.165
(ve w)-.275 H(indo).165 E 2.75(wi)-.275 G(ncrease)-2.75 E(rates.)100.8
402 Q(Ef)100.8 418.6 Q
(fect on congestion control metrics: The synchronization ratio af)-.275
E(fects con)-.275 E -.165(ve)-.44 G -.198(rg).165 G(ence times).198 E
(for high-bandwidth TCPs.)100.8 431.6 Q(Con)5.5 E -.165(ve)-.44 G -.198
(rg).165 G(ence times are kno).198 E(wn to be poor for some high-)-.275
E(bandwidth protocols in en)100.8 444.6 Q(vironments with high le)-.44 E
-.165(ve)-.275 G(ls of synchronization.).165 E([Cite the papers)5.5 E
(by Leith and Shorten.])100.8 457.6 Q(Ho)5.5 E(we)-.275 E -.165(ve)-.275
G .88 -.44(r, i).165 H 2.75(ti).44 G 2.75(sn)-2.75 G
(ot clear if these en)-2.75 E(vironments with high le)-.44 E -.165(ve)
-.275 G(ls of).165 E(synchronization are realistic.)100.8 470.6 Q
(Measurements: Gren)100.8 487.2 Q(ville Armitage and Qiang Fu ha)-.44 E
.33 -.165(ve p)-.22 H(erformed initial e).165 E(xperiments of)-.165 E
(synchronization in the Internet, using Standard TCP \215o)100.8 500.2 Q
(ws, and ha)-.275 E .33 -.165(ve f)-.22 H(ound v).165 E(ery lo)-.165 E
2.75(wl)-.275 G -2.365 -.275(ev e)-2.75 H(ls).275 E(of synchronization.)
100.8 513.2 Q([Appenzeller et al, Sizing Router Buf)100.8 529.8 Q
(fers, reports that synchronization is rare as the)-.275 E
(number of competing \215o)100.8 542.8 Q(ws increases.)-.275 E -.275
(Kev)5.5 G(in Jef).275 E -.11(fa)-.275 G 2.75(yh).11 G
(as some results on synchronization)-2.75 E(also.])100.8 555.8 Q
(Needed: W)100.8 572.4 Q 2.75(en)-.88 G
(eed measurements of the synchronization ratio for \215o)-2.75 E
(ws that use high-)-.275 E(bandwidth protocols o)100.8 585.4 Q -.165(ve)
-.165 G 2.75(rh).165 G(igh-bandwidth paths, gi)-2.75 E -.165(ve)-.275 G
2.75(nt).165 G(ypical le)-2.75 E -.165(ve)-.275 G(ls of competing traf)
.165 E<8c63>-.275 E
(and with typical queuing mechanisms at routers \(whate)100.8 598.4 Q
-.165(ve)-.275 G 2.75(rt).165 G(hese are\), to see if there are)-2.75 E
(higher le)100.8 611.4 Q -.165(ve)-.275 G(ls of synchronization with hi\
gh-bandwidth protocols such as HighSpeed TCP).165 E(,)-1.221 E -.165(Fa)
100.8 624.4 S(st TCP).165 E 2.75(,a)-1.221 G(nd the lik)-2.75 E
(e, which are more aggressi)-.11 E .33 -.165(ve t)-.275 H
(han Standard TCP).165 E 5.5(.T)-1.221 G(he assumption)-5.5 E -.11(wo)
100.8 637.4 S(uld be that in man).11 E 2.75(ye)-.165 G -.44(nv)-2.75 G
(ironments, high-bandwidth protocols ha).44 E .33 -.165(ve h)-.22 H
(igher le).165 E -.165(ve)-.275 G(ls of).165 E
(synchronization than \215o)100.8 650.4 Q(ws using Standard TCP)-.275 E
(.)-1.221 E F1(10.)72 676.4 Q F2(Dr)5.5 E
(op or Mark Rates as a Function of P)-.252 E(ack)-.14 E(et Size)-.14 E
F0(De\214nition: Drop rates as a function of pack)100.8 693 Q
(et size are de\214ned by the actual drop rates for)-.11 E(dif)100.8 706
Q(ferent pack)-.275 E
(ets on an end-to-end path or on a congested link o)-.11 E -.165(ve)
-.165 G 2.75(rap).165 G(articular time)-2.75 E(interv)100.8 719 Q 2.75
(al. In)-.275 F(some cases, e.g., Drop-T)2.75 E
(ail queues in units of pack)-.88 E(ets, general statements can)-.11 E
(Flo)72 769 Q(yd, K)-.11 E 276.229(ohler Section)-.385 F 2.75(10. [P)
2.75 F(age 6])-.165 E 0 Cg EP
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85 Q(ge and small pack)-.198 E(ets will e)-.11 E
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(ther cases, e.g., Drop-T)-2.75 E
(ail queues in units of bytes, no such general statement)-.88 E
(can be made, and the drop rate as a function of pack)100.8 111 Q
(et size will be determined in part by the)-.11 E(traf)100.8 124 Q
(\214c mix at the congested link at that point of time.)-.275 E
(Determining f)100.8 140.6 Q
(actors: The drop rate as a function of pack)-.11 E
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153.6 Q(E.g., is the Drop-T)5.5 E(ail queue in units of pack)-.88 E
(ets, of bytes, of 60-byte)-.11 E -.22(bu)100.8 166.6 S -.275(ff).22 G
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E(QM mechanism in pack)-.605 E(et mode, dropping each)-.11 E(pack)100.8
179.6 Q(et with the same probability)-.11 E 2.75(,o)-.715 G 2.75(ri)
-2.75 G 2.75(nb)-2.75 G(yte mode, with the probability of dropping or)
-2.75 E(marking a pack)100.8 192.6 Q(et being proportional to the pack)
-.11 E(et size in bytes.)-.11 E(The ef)100.8 209.2 Q(fect of pack)-.275
E(et size on drop rate w)-.11 E(ould also be af)-.11 E
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(scheduling for small pack)100.8 222.2 Q(ets, or by dif)-.11 E
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-.275 E(ws)-.275 E(\(e.g., per)100.8 235.2 Q(-\215o)-.22 E 2.75(ws)-.275
G(cheduling, or dif)-2.75 E(ferential scheduling for UDP and TCP traf)
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-2.75 G(ironments, the drop rate as a function of pack).44 E
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100.8 264.8 Q(\214c mix at a particular time.)-.275 E -.165(Fo)5.5 G
2.75(re).165 G(xample, is the traf)-2.915 E(\214c mix dominated by lar)
-.275 E(ge)-.198 E(pack)100.8 277.8 Q(ets, or by smaller ones?)-.11 E
(In some cases, the o)5.5 E -.165(ve)-.165 G(rall pack).165 E
(et drop rate could also af)-.11 E(fect)-.275 E(the relati)100.8 290.8 Q
.33 -.165(ve d)-.275 H(rop rates for dif).165 E(ferent pack)-.275 E
(et sizes.)-.11 E(Ef)100.8 307.4 Q(fect on congestion control metrics: \
The drop rate as a function of pack)-.275 E(et size has a)-.11 E
(signi\214cant ef)100.8 320.4 Q
(fect on the performance of congestion control for V)-.275 E
(oIP and other small-pack)-1.419 E(et)-.11 E<8d6f>100.8 333.4 Q 2.75
(ws. [Citation:)-.275 F("TFRC for V)2.75 E(oice: the V)-1.419 E(oIP V)
-1.419 E(ariant", draft-ietf-dccp-tfrc-v)-1.221 E(oip-02.txt, and)-.22 E
(earlier papers.])100.8 346.4 Q(The drop rate as a function of pack)5.5
E(et size also has an ef)-.11 E(fect on TCP)-.275 E
(performance, as it af)100.8 359.4 Q(fects the drop rates for TCP')-.275
E 2.75(sS)-.605 G(YN and A)-2.75 E(CK pack)-.44 E 2.75(ets. [Citation:)
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E(Measurements: W)100.8 389 Q 2.75(en)-.88 G
(eed measurements of the drop rate as a function of pack)-2.75 E
(et size o)-.11 E -.165(ve)-.165 G 2.75(ra).165 G
(wide range of paths, or for a wide range of congested links.)100.8 402
Q -.165(Fo)5.5 G 2.75(rt).165 G(ests of relati)-2.75 E .33 -.165(ve d)
-.275 H(rop rates).165 E(on end-to-end pack)100.8 415 Q
(ets, one possibility w)-.11 E(ould be to run successi)-.11 E .33 -.165
(ve T)-.275 H(CP connections with).165 E
(200-byte, 512-byte, and 1460-byte pack)100.8 428 Q
(ets, and to compare the pack)-.11 E(et drop rates.)-.11 E(The)5.5 E
(ideal test w)100.8 441 Q
(ould include running TCP connections on the re)-.11 E -.165(ve)-.275 G
(rse path, to measure the drop).165 E(rates for the small A)100.8 454 Q
(CK pack)-.44 E(ets on the forw)-.11 E(ard path.)-.11 E(It w)5.5 E
(ould also be useful to)-.11 E(characterize the dif)100.8 467 Q
(ference in drop rates for 200-byte TCP pack)-.275 E
(ets and 200-byte UDP)-.11 E(pack)100.8 480 Q(ets, e)-.11 E -.165(ve)
-.275 G 2.75(nt).165 G(hough some of this dif)-2.75 E
(ference could be due to the relati)-.275 E .33 -.165(ve b)-.275 H
(urstiness of the)-.055 E(dif)100.8 493 Q(ferent connections.)-.275 E
(Ping e)100.8 509.6 Q(xperiments could also be used to get measurements\
 of drop rates as a function size,)-.165 E -.22(bu)100.8 522.6 S 2.75
(ti).22 G 2.75(tw)-2.75 G(ould be necessary to mak)-2.86 E 2.75(es)-.11
G(ure that the ping sending rates were adjusted to be TCP-)-2.75 E
(friendly)100.8 535.6 Q(.)-.715 E([Cite the kno)100.8 552.2 Q
(wn literature on drop rates as a function of pack)-.275 E(et size.])
-.11 E(Our conjecture is that there is a wide range of beha)100.8 568.8
Q(viors for this characteristic in the real)-.22 E -.11(wo)100.8 581.8 S
2.75(rld. Routers).11 F(include Drop-T)2.75 E(ail queues in pack)-.88 E
(ets, bytes, and b)-.11 E(uf)-.22 E(fer sizes in between;)-.275 E
(these will ha)100.8 594.8 Q .33 -.165(ve q)-.22 H(uite dif).165 E
(ferent drop rates as a function of pack)-.275 E(et size.)-.11 E
(Some routers include)5.5 E(RED in byte mode \(the def)100.8 607.8 Q
(ault for RED in Linux\) and some ha)-.11 E .33 -.165(ve R)-.22 H
(ED in pack).165 E(et mode)-.11 E(\(Cisco, I belie)100.8 620.8 Q -.165
(ve)-.275 G 2.75(\). This).165 F(also af)2.75 E
(fects drop rates as a function of pack)-.275 E(et size.)-.11 E
(Some routers on congested access links use per)100.8 637.4 Q(-\215o)
-.22 E 2.75(ws)-.275 G 2.75(cheduling. In)-2.75 F
(this case, does the per)2.75 E(-)-.22 E<8d6f>100.8 650.4 Q 2.75(ws)
-.275 G(cheduling ha)-2.75 E .33 -.165(ve t)-.22 H(he goal of f).165 E
(airness in *bytes* per second or in *pack)-.11 E(ets* per second?)-.11
E(What ef)100.8 663.4 Q(fect does the per)-.275 E(-\215o)-.22 E 2.75(ws)
-.275 G(cheduling ha)-2.75 E .33 -.165(ve o)-.22 H 2.75(nt).165 G
(he drop rate as a function of pack)-2.75 E(et size,)-.11 E(for pack)
100.8 676.4 Q(ets in dif)-.11 E(ferent \215o)-.275 E
(ws \(e.g., a small-pack)-.275 E(et V)-.11 E(oIP \215o)-1.419 E 2.75(wc)
-.275 G(ompeting ag)-2.75 E(ainst a lar)-.055 E(ge-)-.198 E(pack)100.8
689.4 Q(et TCP \215o)-.11 E(w\) or for pack)-.275 E
(ets within the same \215o)-.11 E 2.75(w\()-.275 G(small A)-2.75 E
(CK pack)-.44 E(ets and lar)-.11 E(ge data)-.198 E(pack)100.8 702.4 Q
(ets on a tw)-.11 E(o-w)-.11 E(ay TCP connection\).)-.11 E(Flo)72 769 Q
(yd, K)-.11 E 276.229(ohler Section)-.385 F 2.75(10. [P)2.75 F(age 7])
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(op Rates as a Function of Burst Size.)-.252 E F0
(De\214nition: Burst-tolerance, or drop rates as a function of b)100.8
101.6 Q(urst size, can be de\214ned in terms)-.22 E
(of an end-to-end path, or in terms of aggre)100.8 114.6 Q -.055(ga)
-.165 G(te traf).055 E(\214c on a congested link.)-.275 E(The b)100.8
131.2 Q(urst-tolerance of an end-to-end path is de\214ned in terms of c\
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-.165 E(urstiness within a round-trip time.)-.22 E(When pack)5.5 E
(ets are sent in b)-.11 E(ursts of N)-.22 E(pack)100.8 157.2 Q
(ets, does the drop rate v)-.11 E(ary as a function of N?)-.275 E -.165
(Fo)5.5 G 2.75(re).165 G(xample, if the TCP sender sends)-2.915 E
(small b)100.8 170.2 Q(ursts of K pack)-.22 E
(ets, for K less than the congestion windo)-.11 E 1.43 -.715(w, h)-.275
H .55 -.275(ow d).715 H(oes the size of K).275 E(af)100.8 183.2 Q
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(or a ping tool sending pings at a certain rate in pack)-2.75 E(ets per)
-.11 E(second, one could see ho)100.8 196.2 Q 2.75(wt)-.275 G
(he clustering of the ping pack)-2.75 E(ets in clusters of size K af)
-.11 E(fects)-.275 E(the pack)100.8 209.2 Q(et drop rate.)-.11 E(As al)
5.5 E -.11(wa)-.11 G(ys with such ping e).11 E(xperiments, it w)-.165 E
(ould be important to)-.11 E
(adjust the sending rate to maintain a longer)100.8 222.2 Q
(-term sending rate that w)-.22 E(as TCP-friendly)-.11 E(.)-.715 E
(Determining f)100.8 238.8 Q(actors: The b)-.11 E
(urst-tolerance is determined lar)-.22 E(gely by the A)-.198 E
(QM mechanisms)-.605 E
(for the congested routers on a path, and by the traf)100.8 251.8 Q
(\214c mix.)-.275 E -.165(Fo)5.5 G 2.75(raD).165 G(rop-T)-2.75 E
(ail queue with only)-.88 E 2.75(as)100.8 264.8 S
(mall number of competing \215o)-2.75 E(ws, the b)-.275 E
(urst-tolerance is lik)-.22 E(ely to be lo)-.11 E 1.43 -.715(w, a)-.275
H(nd for A).715 E(QM)-.605 E(mechanisms where the pack)100.8 277.8 Q
(et drop rate is a function of the a)-.11 E -.165(ve)-.22 G
(rage queue size rather than).165 E(the instantaneous queue size, the b)
100.8 290.8 Q(urst tolerance should be quite high.)-.22 E(Ef)100.8 307.4
Q(fect on conjestion control metrics: The b)-.275 E
(urst-tolerance of the path or congested link can)-.22 E(af)100.8 320.4
Q(fect f)-.275 E(airness between competing \215o)-.11 E(ws with dif)
-.275 E(ferent round-trip times; for e)-.275 E(xample,)-.165 E
(Standard TCP \215o)100.8 333.4 Q
(ws with longer round-trip times are lik)-.275 E(ely to ha)-.11 E .33
-.165(ve a m)-.22 H(ore b).165 E(ursty arri)-.22 E -.275(va)-.275 G(l)
.275 E(pattern at the congested link that that of Standard TCP \215o)
100.8 346.4 Q(ws with shorter round-trip times.)-.275 E
(As a result, in en)100.8 359.4 Q(vironment with lo)-.44 E 2.75(wb)-.275
G(urst tolerance \(e.g., scenarios with Drop-T)-2.97 E(ail)-.88 E
(queues\), longer)100.8 372.4 Q
(-round-trip-time TCP connections can see higher pack)-.22 E
(et drop rates than)-.11 E(other TCP connections, and recei)100.8 385.4
Q .33 -.165(ve a)-.275 H 2.75(ne).165 G -.165(ve)-3.025 G 2.75(ns).165 G
(maller fraction of the link bandwidth than)-2.75 E(the)100.8 398.4 Q
2.75(yw)-.165 G(ould otherwise.)-2.86 E([FJ92]\(Section 3.2\).)5.5 E
1.76 -.88(We n)5.5 H(ote that some TCP traf).88 E(\214c is inherently)
-.275 E -.22(bu)100.8 411.4 S(rsty).22 E 2.75(,e)-.715 G(.g., Standard \
TCP without rate-based pacing, particularly in the presence of)-2.75 E
(dropped A)100.8 424.4 Q(CK pack)-.44 E(ets or of A)-.11 E
(CK compression.)-.44 E(The b)5.5 E(urst-tolerance of a router can also)
-.22 E(af)100.8 437.4 Q(fect the delay-throughput tradeof)-.275 E
(fs and pack)-.275 E(et drop rates of the path or of the congested)-.11
E(link.)100.8 450.4 Q(Measurements: One could measure the b)100.8 467 Q
(urst-tolerance of an end-to-end path by running)-.22 E(successi)100.8
480 Q .33 -.165(ve T)-.275 H(CP connections, forcing b).165 E
(ursts of size at least K by dropping an appropriate)-.22 E
(fraction of the A)100.8 493 Q(CK pack)-.44 E(ets to the TCP recei)-.11
E -.165(ve)-.275 G 3.96 -.605(r. A).165 H(lternately).605 E 2.75(,i)
-.715 G 2.75(fo)-2.75 G(ne had control of the TCP)-2.75 E(sender)100.8
506 Q 2.75(,o)-.44 G(ne could modify the TCP sender to send b)-2.75 E
(ursts of K pack)-.22 E(ets when the congestion)-.11 E(windo)100.8 519 Q
2.75(ww)-.275 G(as K or more se)-2.86 E(gments.)-.165 E([Look at Cro)
100.8 535.6 Q -.165(ve)-.165 G(lla').165 E 2.75(sp)-.605 G
(aper on loss pairs.])-2.75 E
([Look at: M. Allman and E. Blanton, "Notes on Burst Mitig)100.8 552.2 Q
(ation for T)-.055 E(ransport Protocols",)-.385 E -.44(AC)100.8 565.2 S
2.75(MC).44 G(omputer Communication Re)-2.75 E(vie)-.275 E 1.43 -.715
(w, v)-.275 H(ol. 35\(2\), \(2005\).]).495 E
(Making inferences about the A)100.8 581.8 Q
(QM mechanism for the congested router on an end-to-end)-.605 E
(path: One potential use of measurement tools for determining the b)
100.8 594.8 Q(urst-tolerance of an end-)-.22 E(to-end path w)100.8 607.8
Q(ould be to mak)-.11 E 2.75(ei)-.11 G
(nferences about the presence or absence of an A)-2.75 E(QM)-.605 E
(mechanism at the congested link or links.)100.8 620.8 Q
(As a simple test, one could run a TCP)5.5 E
(connection until the connection comes out of slo)100.8 633.8 Q 2.75
(w-start. If)-.275 F(the recei)2.75 E .33 -.165(ve w)-.275 H(indo).165 E
2.75(wo)-.275 G 2.75(ft)-2.75 G(he TCP)-2.75 E(connection w)100.8 646.8
Q(as suf)-.11 E(\214ciently high that the connection e)-.275 E
(xited slo)-.165 E(w-start with pack)-.275 E(et drops or)-.11 E
(marks instead of because of the limitation of the recei)100.8 659.8 Q
.33 -.165(ve w)-.275 H(indo).165 E 1.43 -.715(w, o)-.275 H
(ne could record the).715 E(congestion windo)100.8 672.8 Q 2.75(wa)-.275
G 2.75(tt)-2.75 G(he end of slo)-2.75 E(w-start, and the number of pack)
-.275 E(ets dropped from this)-.11 E(windo)100.8 685.8 Q 4.18 -.715
(w. A)-.275 H(high pack)3.465 E
(et drop rate might be more typical of a Drop-T)-.11 E
(ail queue with small-)-.88 E(scale statistical multiple)100.8 698.8 Q
(xing on the congested link, and a single pack)-.165 E
(et drop coming out of)-.11 E(slo)100.8 711.8 Q(w-start w)-.275 E
(ould suggest an A)-.11 E(QM mechanism at the congested link.)-.605 E
(Flo)72 769 Q(yd, K)-.11 E 276.229(ohler Section)-.385 F 2.75(11. [P)
2.75 F(age 8])-.165 E 0 Cg EP
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(March 2006)2.75 E(September 2005)97.766 E
(The synchronization measure could also add information about the lik)
100.8 85 Q(ely presence or)-.11 E(absence of A)100.8 98 Q(QM on the con\
gested link\(s\) of an end-to-end path, with paths with higher)-.605 E
(le)100.8 111 Q -.165(ve)-.275 G(ls of synchronization being more lik)
.165 E(ely to ha)-.11 E .33 -.165(ve D)-.22 H(rop-T).165 E
(ail queues with small-scale)-.88 E(statistical multiple)100.8 124 Q
(xing on the congested link\(s\).)-.165 E([Cite the rele)100.8 140.6 Q
-.275(va)-.275 G(nt literature about tools for determining the A).275 E
(QM mechanism on an end-to-)-.605 E(end path.])100.8 153.6 Q/F1 11
/Times-Bold@0 SF(12.)72 179.6 Q/F2 14/Times-Bold@0 SF(Congestion Contr)
5.5 E(ol Mechanisms f)-.252 E(or Backgr)-.35 E(ound or Competing)-.252 E
-1.036(Tr)72 192.6 S(af\214c)1.036 E F0(Ef)100.8 209.2 Q
(fect on congestion control metrics: Please don')-.275 E 2.75(te)-.198 G
-.275(va)-3.025 G(luate A).275 E(QM mechanisms by using)-.605 E
(Reno TCP)100.8 222.2 Q 2.75(,o)-1.221 G 2.75(re)-2.75 G -.275(va)-3.025
G(luate ne).275 E 2.75(wt)-.275 G
(ransport protocols by comparing them with the performance of)-2.75 E
(Reno TCP!)100.8 235.2 Q -.165(Fo)5.5 G 2.75(ra).165 G 2.75(ne)-2.75 G
(xplanation, see [FK02]\(Section 3.4\).)-2.915 E 2.75(Measurements: See)
100.8 251.8 R([MAF05].)2.75 E F1(13.)72 277.8 Q F2
(Characterization of Congested Links in T)5.5 E(erms of Band)-1.288 E
(width and)-.21 E -1.036(Ty)72 290.8 S(pical Le)1.036 E -.14(ve)-.21 G
(ls of Congestion).14 E F0([Pointers to the current state of our kno)
100.8 307.4 Q(wledge.])-.275 E F1(14.)72 333.4 Q F2
(Characterization of Challenging Lo)5.5 E(wer Lay)-.14 E(ers.)-.14 E F0
([This will just be a short set of pointers to the rele)100.8 350 Q
-.275(va)-.275 G(nt literature, which is quite e).275 E(xtensi)-.165 E
-.165(ve)-.275 G(.]).165 E F1(15.)72 376 Q F2(Characterization of Netw)
5.5 E(ork Changes Affecting Congestion)-.14 E F0
([Pointers to the current state of our kno)100.8 392.6 Q(wledge.])-.275
E F1(16.)72 418.6 Q F2(Using the T)5.5 E(ools Pr)-1.288 E
(esented in this Document)-.252 E F0([T)100.8 435.2 Q 2.75(ob)-.88 G
2.75(ed)-2.75 G(one.])-2.75 E F1(17.)72 461.2 Q F2(Related W)5.5 E(ork)
-1.05 E F0([Cite "On the Ef)100.8 477.8 Q(fecti)-.275 E .33 -.165(ve E)
-.275 H -.275(va).165 G(luation of TCP" by Allman and F).275 E(alk.])
-.165 E F1(18.)72 503.8 Q F2(Conclusions)5.5 E F0([T)100.8 520.4 Q 2.75
(ob)-.88 G 2.75(ed)-2.75 G(one.])-2.75 E F1(19.)72 546.4 Q F2
(Security Considerations)5.5 E F0
(There are no security considerations in this document.)100.8 563 Q F1
(20.)72 589 Q F2(IAN)5.5 E 3.5(AC)-.28 G(onsiderations)-3.5 E F0
(There are no IAN)100.8 605.6 Q 2.75(Ac)-.385 G
(onsiderations in this document.)-2.75 E F1(21.)72 631.6 Q F2(Ackno)5.5
E(wledgements)-.14 E(Inf)72 661.2 Q(ormati)-.35 E .28 -.14(ve R)-.14 H
(efer).14 E(ences)-.252 E F0([RFC 2119] S. Bradner)100.8 677.8 Q 2.75
(.K)-.605 G .33 -.165(ey W)-3.025 H(ords F)-.715 E
(or Use in RFCs to Indicate Requirement Le)-.165 E -.165(ve)-.275 G(ls.)
.165 E(RFC 2119.)129.6 690.8 Q([MA)100.8 707.4 Q(WI] M.W)-.99 E 2.75(.G)
-1.012 G(roup, Ma)-2.75 E(wi w)-.165 E(orking group traf)-.11 E
(\214c archi)-.275 E -.165(ve)-.275 G 2.75(,U).165 G(RL)-2.75 E
("http://tracer)129.6 720.4 Q(.csl.son)-.605 E -.715(y.)-.165 G(jp/ma)
.715 E(wi/".)-.165 E(Flo)72 769 Q(yd, K)-.11 E 331.229(ohler [P)-.385 F
(age 9])-.165 E 0 Cg EP
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(March 2006)2.75 E(September 2005)97.766 E([AKSJ03] J. Aikat, J. Kaur)
100.8 85 Q 2.75(,F)-.44 G(.D. Smith, and K. Jef)-3.63 E -.11(fa)-.275 G
1.43 -.715(y, V).11 H(ariability in TCP Roundtrip T)-.506 E(imes,)-.385
E -.44(AC)129.6 98 S 2.75(MS).44 G
(IGCOMM Internet Measurement Conference, Maimi, FL, October 2003, pp.)
-2.75 E(279-284.)129.6 111 Q([A00] M. Allman, A W)100.8 127.6 Q(eb Serv)
-.88 E(er')-.165 E 2.75(sV)-.605 G(ie)-3.41 E 2.75(wo)-.275 G 2.75(ft)
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