linux-kernel - Re: dst cache overflow

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Date:	Sat, 15 Dec 2007 11:08:58 +0100
From:	Tobias Diedrich <ranma+kernel@...edrich.de>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	linux-net@...r.kernel.org, linux-kernel@...r.kernel.org,
	dada1@...mosbay.com
Subject: Re: dst cache overflow

Herbert Xu wrote:
> Tobias Diedrich <ranma+kernel@...edrich.de> wrote:
> >
> > Meanwhile I added a slab statistic rrd script. Nothing obvious to
> > see on ari or yumi yet, but on oni (which after all is the most
> > affected by this) I can see 'size_2048' and 'TCPv6' growing
> > steadily along with the route cache size (Presumably 'ip_dst_cache',
> > which is also growing larger at a more or less constant rate).
> 
> OK that almost certainly means that we have a leak of TCPv6
> objects which would then cause a leak of dst objects.
> 
> So you need to track down why TCPv6 isn't getting cleaned up.
> First check the obvious, do you have any process(es) that are
> hoarding TCPv6 sockets?

Hmm, how do I look for that, if netstat doesn't look suspicous?

> If not do you see a growing list of dead sockets in netstat?

No, I don't think so.

oni:~# netstat -an | wc -l
139
oni:~# netstat -tun
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 217.172.187.75:53668    xx.xxx.xx.x:6543        ESTABLISHED
tcp        0      0 217.172.187.75:40180    yyy.yyy.yyy.yy:6871     TIME_WAIT  
tcp        0      0 217.172.187.75:58480    xx.xxx.xx.x:6543        ESTABLISHED
tcp        0      0 217.172.187.75:49213    xx.xxx.xx.x:6543        ESTABLISHED
tcp        0      0 217.172.187.75:34828    xx.xxx.xx.x:6543        ESTABLISHED
tcp        0      0 217.172.187.75:44859    xx.xxx.xx.x:6543        ESTABLISHED
tcp        0      0 217.172.187.75:41863    xx.xxx.xx.x:6543        ESTABLISHED
tcp        0      0 217.172.187.75:38063    xx.xxx.xx.x:6543        ESTABLISHED
tcp6       0      0 ::ffff:217.172.187.7:80 ::ffff:zz.zzz.zz.z:3729 TIME_WAIT  
tcp6       0      0 ::ffff:217.172.187.7:80 ::ffff:zz.zzz.zz.z:3726 TIME_WAIT  
tcp6       0      0 ::ffff:217.172.187.7:80 ::ffff:aa.aa.aaa.:59396 ESTABLISHED
tcp6       0    992 ::ffff:217.172.187.7:22 ::ffff:bb.bbb.bb.:57870 ESTABLISHED

HTH,

-- 
Tobias						PGP: http://9ac7e0bc.uguu.de
このメールは十割再利用されたビットで作られています。
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