Date: Mon, 01 Dec 2008 12:24:29 -0300 From: Paulo Fragoso <paulo@nlink.com.br> To: Petri Helenius <petri@helenius.fi> Cc: freebsd-net@freebsd.org, Andre Oppermann <andre@freebsd.org> Subject: Re: FreeBSD 7.1 tcp problem (syncache)? Message-ID: <493401AD.90801@nlink.com.br> In-Reply-To: <49340061.1060100@helenius.fi> References: <4933EC58.5030204@nlink.com.br> <4933F7D6.50805@freebsd.org> <49340061.1060100@helenius.fi>
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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.
>>
>
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