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<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I would like to make reply for two short comments made by
Zhang and Lars.</FONT></DIV>
<DIV><FONT size=2></FONT><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Zhang wrote :</FONT></DIV>
<DIV><FONT size=2>> The link bandwidth is growing very
fast, how about the share of bandwidth for<BR> > each
connection? The applications and the users on Internet are
exploding.<BR> > So we must make clear first which factor
contributes more.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I am also curious about whether inter-arrival time of
file transfer request also scales with BDP.</FONT></DIV>
<DIV><FONT size=2>I welcome any comments on this.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>
<DIV><FONT size=2>Lars wrote :</FONT></DIV>
<DIV><FONT size=2>>That same table also shows that HTTP traffic volume is an
order of<BR>> magnitude greater than FTP traffic volume. By looking at FTP
flow lengths<BR>> alone you'll get a very skewed view of the overall traffic
characteristics<BR>> today.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I don't think it affects the observation that file size
increases over time.</FONT></DIV>
<DIV><FONT size=2>The size of file downloaded by HTTP in 1997 seems to have
average of 10.5KB.</FONT></DIV>
<DIV><FONT size=2>This is also higher than file size considered in Tcplib of
1991, which has average of 100B.</FONT></DIV>
<DIV> </DIV></FONT></DIV>
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<DIV style="FONT: 10pt ±¼¸²">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt ±¼¸²; font-color: black"><B>From:</B> <A
title=shlee@mmlab.snu.ac.kr href="mailto:shlee@mmlab.snu.ac.kr">Soo-hyeong
Lee</A> </DIV>
<DIV style="FONT: 10pt ±¼¸²"><B>To:</B> <A title=end2end-interest@postel.org
href="mailto:end2end-interest@postel.org">end2end-interest</A> </DIV>
<DIV style="FONT: 10pt ±¼¸²"><B>Sent:</B> Friday, April 06, 2001 1:35 AM</DIV>
<DIV style="FONT: 10pt ±¼¸²"><B>Subject:</B> [e2e] bandwidth and file size</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Hello,</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>It is well known that link bandwidth of the Internet is
growing very fast.</FONT></DIV>
<DIV><FONT size=2>Does the file size also grow at the same speed? Or is it
much slower?</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I have once read a Kleinrock's paper saying that future
large bandwidth delay network must deal with the case where file size is
relatively smaller than BDP(bandwidth delay product).</FONT></DIV>
<DIV><FONT size=2>However, I have found that file size also
increases.</FONT></DIV>
<DIV><FONT size=2>In near 1991, file size (transferred by FTP) must have been
100B in average and mostly below 100 KB, according to Fig.2 (c) in Tcplib
documentation </FONT><A
href="http://irl.eecs.umich.edu/jamin/papers/tcplib/"><FONT
size=2>http://irl.eecs.umich.edu/jamin/papers/tcplib/</FONT></A><FONT
size=2>.</FONT></DIV>
<DIV><FONT size=2>In near 1997, it increases to 240KB in average, according to
Table 1 of Claffy's paper "the nature of the beast: recent traffic
measurements from an Internet backbone," Inet, '98 at
http://www.caida.org/outreach/papers/Inet98/</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I think this issue is related with the performance of TCP
congestion control in the large BDP environment, because small file size means
that performance impact of initial slow-start gets more stressed and
congestion-avoidance gets less important.</FONT></DIV>
<DIV><FONT size=2>I hope you will make kind comments.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Thanks and regards.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Soo-hyeong</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV>
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