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Re: Memory leak in 2.6.11-rc1?

To: Andrew Morton <akpm@xxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxx>, alexn@xxxxxxxxx, kas@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxx
Subject: Re: Memory leak in 2.6.11-rc1?
From: Russell King <rmk+lkml@xxxxxxxxxxxxxxxx>
Date: Thu, 27 Jan 2005 08:28:09 +0000
In-reply-to: <20050125193207.B30094@flint.arm.linux.org.uk>; from rmk+lkml@arm.linux.org.uk on Tue, Jan 25, 2005 at 07:32:07PM +0000
Mail-followup-to: Andrew Morton <akpm@xxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxx>, alexn@xxxxxxxxx, kas@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxx
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On Tue, Jan 25, 2005 at 07:32:07PM +0000, Russell King wrote:
> On Mon, Jan 24, 2005 at 11:48:53AM +0000, Russell King wrote:
> > On Sun, Jan 23, 2005 at 08:03:15PM +0000, Russell King wrote:
> > > I think I may be seeing something odd here, maybe a possible memory leak.
> > > The only problem I have is wondering whether I'm actually comparing like
> > > with like.  Maybe some networking people can provide a hint?
> > > 
> > > Below is gathered from 2.6.11-rc1.
> > > 
> > > bash-2.05a# cat /proc/net/rt_cache | wc -l; grep ip_dst /proc/slabinfo
> > > 24
> > > ip_dst_cache         669    885    256   15    1
> > > 
> > > I'm fairly positive when I rebooted the machine a couple of days ago,
> > > ip_dst_cache was significantly smaller for the same number of lines in
> > > /proc/net/rt_cache.
> > 
> > FYI, today it looks like this:
> > 
> > bash-2.05a# cat /proc/net/rt_cache | wc -l; grep ip_dst /proc/slabinfo
> > 26
> > ip_dst_cache         820   1065    256   15    1 
> > 
> > So the dst cache seems to have grown by 151 in 16 hours...  I'll continue
> > monitoring and providing updates.
> 
> Tonights update:
> 50
> ip_dst_cache        1024   1245    256   15    1
> 
> As you can see, the dst cache is consistently growing by about 200
> entries per day.  Given this, I predict that the box will fall over
> due to "dst cache overflow" in roughly 35 days.

This mornings magic numbers are:

3
ip_dst_cache        1292   1485    256   15    1

Is no one interested in the fact that the DST cache is leaking and
eventually takes out machines?  I've had virtually zero interest in
this problem so far.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core

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