linux-kernel - Re: Order 0 page allocation failure under heavy I/O load

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Message-Id: <200810270547.31123.ctpm@ist.utl.pt>
Date:	Mon, 27 Oct 2008 06:47:31 +0100
From:	Claudio Martins <ctpm@....utl.pt>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Order 0 page allocation failure under heavy I/O load

On Sunday 26 October 2008, Dave Chinner wrote:

> The host will hang for tens of seconds at a time with both CPU cores
> pegged at 100%, and eventually I get this in dmesg:
>
> [1304740.261506] linux: page allocation failure. order:0, mode:0x10000
> [1304740.261516] Pid: 10705, comm: linux Tainted: P          2.6.26-1-amd64

 Hello,

 Have you tried to increase vm.min_free_kbytes to something higher, that is 
>=30000?

 I think I have hit something similar on a box running nbd-server to export a 
3 SATA disk raid0 block device over Gigabit Ethernet.
 Increasing min_free_kbytes got rid of the messages for me... Though the load 
on your system is much higher than on mine.

 Regards

Cláudio

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