netdev - Re: Memory leak in ip_dst

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Date:	Fri, 9 Sep 2011 15:53:45 -0700 (PDT)
From:	Kumar S <ps2kumar@...oo.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: Memory leak in ip_dst_cache

Yes Eric, this command doesn't work on 2.6.24. Which timer are you suspecting?


----- Original Message -----
From: Eric Dumazet <eric.dumazet@...il.com>
To: Kumar S <ps2kumar@...oo.com>
Cc: netdev <netdev@...r.kernel.org>
Sent: Friday, September 9, 2011 3:08 PM
Subject: Re: Memory leak in ip_dst_cache

Le vendredi 09 septembre 2011 à 14:58 -0700, Kumar S a écrit :
> I agree, 3 MB is not a concern. But actually this is exceeding, we are
> seeing more than 1200000 objects in a span of 24 hours, which is close
> to 300 MB.

Hmm, please include netdev in your mails.

Then there is something else.

Maybe a timer bug preventing dst_gc_task() to make its duty.

>  Other tasks require somewhere around 200 MB+. When it reaches this
> number, the board reboots. In lab we could simulate this. That is how
> I'm trying to understand the problem. I'm injecting around 10k routes,
> and waiting for them to ageout.
>  

I dont know, you could try disable IP route cache.

On recent (2.6.29+) kernels, thats very easy

# Disable Ip route cache (negative value in rebuild_count)
echo 3000000000 >/proc/sys/net/ipv4/rt_cache_rebuild_count

On an old kernel, you probably need to patch your kernel, or backport
commit 1080d709fb9d8cd43 (net: implement emergency route cache rebulds
when gc_elasticity is exceeded)
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