netdev - RE: kernel ipsec error

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Date:	Tue, 12 Jun 2012 08:31:18 +0200
From:	Marco Berizzi <pupilla@...mail.com>
To:	<bhutchings@...arflare.com>
CC:	<netdev@...r.kernel.org>
Subject: RE: kernel ipsec error


bhutchings@...arflare.com wrote:
> On Mon, 2012-06-11 at 14:45 +0200, Marco Berizzi wrote:
> > Hello everybody.
> >
> > After 12 days uptime I got this message.
> > Linux is 3.3.5 32bit, running openswan
> > (this is an ipsec gateway/netfilter
> > firewall) and squid.
> >
> > Jun 11 12:53:02 Pleiadi kernel: SLUB: Unable to allocate memory on node -1 (gfp=0x20)
> > Jun 11 12:53:02 Pleiadi kernel: cache: kmalloc-2048, object size: 2048, buffer size: 2048, default order: 2, min order: 0
> > Jun 11 12:53:02 Pleiadi kernel: node 0: slabs: 61, objs: 476, free: 0
> > Jun 11 12:53:02 Pleiadi kernel: kworker/0:2: page allocation failure: order:0, mode:0x4020
>
> So a single page allocation in atomic (non-sleeping) context failed.
>
> [...]
> > Jun 11 12:53:02 Pleiadi kernel: Free swap = 130908kB
> > Jun 11 12:53:02 Pleiadi kernel: Total swap = 151164kB
> > Jun 11 12:53:02 Pleiadi kernel: 40944 pages RAM
> [...]
>
> Not too surprising with this little RAM available (swap didn't help
> since we couldn't wait for swap-out).

yes, this is really a very old hardware.

> There could be a memory leak, but you would need to read /proc/meminfo
> and /proc/slabinfo at intervals to work out whether that was the case.

Kindly, may you tell me which should be the intervals? One second? one minute?
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