linux-kernel - Re: dst cache overflow

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Message-Id: <20070814192453.5a873723.dada1@cosmosbay.com>
Date:	Tue, 14 Aug 2007 19:24:53 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Tobias Diedrich <ranma+kernel@...edrich.de>
Cc:	linux-netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: dst cache overflow

On Tue, 14 Aug 2007 18:06:46 +0200
Tobias Diedrich <ranma+kernel@...edrich.de> wrote:

> Hello,
> 
> I suspect I'm seeing a slow dst cache leakage on one of my servers.
> The server in question (oni) regularly needs to be rebooted, because
> it loses network connectivity. However, netconsole and syslog shows that the
> machine is still running and the kernel complains about "dst cache
> overflow".
> 
> I have since installed a monitoring script, which stores the output of
> both "ip route ls cache | fgrep cache | wc -l" and the 'entries' value
> of /proc/net/stat/rt_cache (as suggested in 
> http://www.mail-archive.com/netdev@vger.kernel.org/msg02107.html)
> and produces a nice rrd graph:
> 
> http://uguu.de/~ranma/route-month-oni.png
> So entries is growing more or less constantly, while the number of
> active routes (not visible on the graph due to being too small) is
> relatively constant.
> 
> Comparing this to another host running the exact same kernel:
> http://uguu.de/~ranma/route-month-ari.png
> Here cached_routes and entries barely differ at all.
> 
> The funny thing is, both hosts are running the exact same kernel
> and use more or less the same iptables rules.
> 
> So I'm not sure what would cause the dst cache to leak only on host
> oni?
> 

Could you send the result of these commands on oni and ari ?

ip route ls
grep . /proc/sys/net/ipv4/route/*

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