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SubjectRe: TCP kernel tables overflowing after sustained 1000 new connections per second
>> The third problem seems to be connected to /proc/net/tcp6
>>
>> look at the output of the script
>>
>> while true ; do echo "`date`: `cat /proc/net/tcp6 | wc -l` vs `cat
>> /proc/net/tcp | wc -l`" ; sleep 1 ; done
>>
>> while I run my load test:
>>
>>
>> Wed Sep 9 20:39:26 SAST 2009: 5 vs 20
>> Wed Sep 9 20:39:27 SAST 2009: 5 vs 20
>> Wed Sep 9 20:39:28 SAST 2009: 5 vs 20
>> Wed Sep 9 20:39:29 SAST 2009: 5 vs 20
>> Wed Sep 9 20:39:31 SAST 2009: 1233 vs 20
>> Wed Sep 9 20:39:32 SAST 2009: 2640 vs 21
>> Wed Sep 9 20:39:33 SAST 2009: 4190 vs 20
>> Wed Sep 9 20:39:34 SAST 2009: 5813 vs 20
>> Wed Sep 9 20:39:35 SAST 2009: 7527 vs 20
>> Wed Sep 9 20:39:37 SAST 2009: 9568 vs 44
>> Wed Sep 9 20:39:38 SAST 2009: 11819 vs 21
>> Wed Sep 9 20:39:40 SAST 2009: 14510 vs 21
>> Wed Sep 9 20:39:42 SAST 2009: 16971 vs 20
>> Wed Sep 9 20:39:44 SAST 2009: 16971 vs 20
>> Wed Sep 9 20:39:46 SAST 2009: 17013 vs 20
>> Wed Sep 9 20:39:48 SAST 2009: 17013 vs 20
>> Wed Sep 9 20:39:50 SAST 2009: 17013 vs 20
>>
>> So it is clear "something" is filling up in tcp_ipv6.c

By default, apache is going to open an IPv6 socket, so every connection,
even IPv4, will use an IPv6 socket with a mapped address:

# netstat -anp | grep apache
tcp6 0 0 :::80 :::* LISTEN 27795/apache2
tcp6 0 0 ::ffff:10.0.0.1:80 ::ffff:10.0.0.2:35271 ESTABLISHED27813/apache2

I'm guessing that 17013 is your 16384 plus a few in time-wait, right?

There's a way to change it to be IPv4-only in the conf file from what I remember.

-Brian



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