On Sun, 5 Dec 2004 18:31:47 -0600, Dan Foreman [EMAIL PROTECTED] wrote:
Hi,
I've learned more since my last questions about tomcat 5 vs 4 performance.
The reason that it seems so much slower is that there
are more than twice as many packets being returned from the application
server...most of which are SYN/SYN-ACK packets (no
exaggeration, from 300 packets in tomcat 4 to 800 in tomcat 5). Initially
the SYN requests come from the browser (true for IE and
FireFox). Theorizing that the problem could be solved changing the
connectionLinger setting from the default of 0 to 2000 ms we
tried, but had no consistent change in the amount of SYN/SYN-ACK packets
being exchanged between the browser and tomcat. The
inconsistency in behavior leads me to believe that the problem is somehow
related to load (network/cpu/etc), on occasion tomcat 5
will respond as tomcat 4 does (no extra chatter). Tomcat 4 running across
the same exact network, through the same context switch
does not exhibit this everthere is a single SYN/SYN-ACK initially and
then just typical request/responses.
Anybody else seen this?
No. You'll need to look at this in detail, and I recommend doing some
of the testing with really simple stuff (such as static files).
--
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Rémy Maucherat
Developer Consultant
JBoss Group (Europe) SàRL
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