FreeBSD 7.1 tcp problem (syncache)?

[Paulo Fragoso]

Our machine test have apache-2.0.61_2 running FreeBSD-6.3-RELEASE-p3, 
its ab program is used on all tests.

Paulo.

On 01/12/2008 12:18, Petri Helenius wrote:
>
> I couldn't get Apache 2.2 ab to work on 7.0 at all. The ab from 2.0 
> worked fine...
>
> Pete
>
>
> Andre Oppermann wrote:
>> Paulo Fragoso wrote:
>>> 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
>>
>> This error is harmless and occurs when the client closes the socket
>> before the TCP session has terminated.  The RST have crossed and hit
>> the syncache.  The same happens on 6.4 but it never told you about it.
>>
>>> All sysctl and apache conf are same on both server, is there a tcp 
>>> problem with FreeBSD 7.x?
>>
>> Are you using the HTTP accept filter on the server?  This may cause
>> the listen accept queue to overflow.
>>
>> Please post the output of "netstat -n -s -p tcp" to further diagnose
>> the problem.
>>
>