<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<TITLE>Bericht</TITLE>
<META content="MSHTML 6.00.2900.3020" name=GENERATOR></HEAD>
<BODY>
<DIV><SPAN class=564463010-05012007><FONT face=Arial size=2>Hello
everyone,</FONT></SPAN></DIV>
<DIV><SPAN class=564463010-05012007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=564463010-05012007><FONT face=Arial size=2>For a research
project I'm comparing the performance of Spread and other related systems.
</FONT></SPAN><SPAN class=564463010-05012007><FONT face=Arial size=2>In this
test I measure the delay between sending a request to a host and getting a
response back from this host.</FONT></SPAN></DIV>
<DIV><SPAN class=564463010-05012007><FONT face=Arial size=2>The request is sent
with multicast, the response gets back unicast. I'm using the Java API under
Windows XP and use 2 hosts for this test.</FONT></SPAN></DIV>
<DIV><SPAN class=564463010-05012007><FONT face=Arial size=2>When using Spread in
this test I get a very strange result, small packets of 512 and 1024
bytes get a much higher delay then larger ones.</FONT></SPAN></DIV>
<DIV><SPAN class=564463010-05012007><FONT face=Arial size=2>The packets of
512 and 1024 bytes have a (standard) total delay of about 195 ms,
larger ones have only a delay between 8 and 19 ms.</FONT></SPAN></DIV>
<DIV><SPAN class=564463010-05012007><FONT face=Arial size=2>This very large
difference cannot be caused by my own implementation, with other multicast
systems this problem doesn't occur and I use the standard Spread
operations.</FONT></SPAN></DIV>
<DIV><SPAN class=564463010-05012007><FONT face=Arial size=2>It seems that it is
caused by the way Spread handles small packets. </FONT></SPAN><SPAN
class=564463010-05012007><FONT face=Arial size=2>Is this standard behaviour
of Spread or is it perhaps caused by a bug?</FONT></SPAN></DIV>
<DIV><SPAN class=564463010-05012007></SPAN><SPAN class=564463010-05012007><FONT
face=Arial size=2>I hope some of you can give an answer on this
question.</FONT></SPAN></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV align=left><FONT face=Arial><FONT size=2><SPAN
class=564463010-05012007>Best regards</SPAN>,</FONT></FONT></DIV>
<DIV align=left><FONT face=Arial><FONT size=2>Marco<SPAN
class=564463010-05012007> Leoné</SPAN></FONT></FONT></DIV>
<DIV> </DIV></BODY></HTML>