linux-kernel - Re: 2.6.32 swapper allocation failure with plenty of memory available

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Message-ID: <1281433022.28245.201.camel@pasglop>
Date:	Tue, 10 Aug 2010 19:37:02 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Mikael Abrahamsson <swmike@....pp.se>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.32 swapper allocation failure with plenty of memory
 available

On Tue, 2010-08-10 at 08:05 +0200, Mikael Abrahamsson wrote:
> Hi.
> 
> Yesterday my Ubuntu 10.04 machine with their 2.6.32 (amd64) kernel, under 
> a lot of disk IO and network stress stopped responding. I thought it had 
> frozen completely, but ~2 hours later it came back to life.
> 
> When I logged in I saw a lot of "swapper allocation failure" and r8169 
> timeouts in dmesg (first time I've seen this cause network instability 
> like this, but it's also the first motherboard I've tested with that has a 
> r8169 NIC).
 .../...

I noticed that on a completely different setup as well... 2.6.32 tend to
have a hard time servicing the skb allocations for demanding network
drivers.

Probably some threshold in the VM that might want tuning...

Cheers,
Ben.


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