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Date: Mon, 01 Dec 2008 10:53:28 -0300
From: Paulo Fragoso <paulo@nlink.com.br>
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Subject: FreeBSD 7.1 tcp problem (syncache)?
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Hi,

We was using one machine with FreeBSD 6.4-RELEASE running 
apache-worker-2.2.3 + mysql, this server can answer high request from 
one client using ab:


{client}$ ab -n 2000 -c 1000 http://system_using_6.4-RELEASE
...
Benchmarking ***** (be patient)
Completed 200 requests
Completed 400 requests
Completed 600 requests
Completed 800 requests
Completed 1000 requests
Completed 1200 requests
Completed 1400 requests
Completed 1600 requests
Completed 1800 requests
Finished 2000 requests
...
{client}$


Using other hardware whit FreeBSD 7.1-PRERELEASE running 
apache-worker-2.2.9_5 + mysql, we have a poor result:


{client}$ ab -n 2000 -c 1000 http://system_using_7.1-PRERELEASE
...
Test aborted after 10 failures

apr_connect(): Invalid argument (22)
{client}$


Looking for a problem on new server log we found:

kernel: TCP: [client]:50197 to [server]:80 tcpflags 0x4<RST>; 
syncache_chkrst: Spurious RST without matching syncache entry (possibly 
syncookie only), segment ignored
kernel: TCP: [client]:53845 to [server]:80 tcpflags 0x4<RST>; 
syncache_chkrst: Spurious RST without matching syncache entry (possibly 
syncookie only), segment ignored
kernel: TCP: [client]:53845 to [server]:80 tcpflags 0x4<RST>; 
syncache_chkrst: Spurious RST without matching syncache entry (possibly 
syncookie only), segment ignored

All sysctl and apache conf are same on both server, is there a tcp 
problem with FreeBSD 7.x?

Paulo Fragoso.