linux-kernel - Re: 2.6.27.8: OOM killer: [swapper: page allocation failure]

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Date:	Tue, 16 Dec 2008 04:20:50 -0500 (EST)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Dan Williams <dan.j.williams@...il.com>
cc:	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	Alan Piszcz <ap@...arrain.com>
Subject: Re: 2.6.27.8: OOM killer: [swapper: page allocation failure]



On Mon, 15 Dec 2008, Dan Williams wrote:

> On Fri, Dec 12, 2008 at 5:14 AM, Justin Piszcz <jpiszcz@...idpixels.com> wrote:
>> [44893.846532] swapper: page allocation failure. order:0, mode:0x20
> [..]
>>
>> Raid optimizations used:
>>
>> # cat oraid.sh |grep -v ^#|grep .
>> . /etc/profile
>> echo "Optimizing RAID Arrays..."
>> cd /sys/block
>> DISKS=$(/bin/ls -1d sd[e-j])
>> echo "Setting read-ahead to 32 MiB for /dev/md0"
>> blockdev --setra 65536 /dev/md0
>> echo "Setting stripe_cache_size to 16 MiB for /dev/md0"
>> echo 16384 > /sys/block/md0/md/stripe_cache_size
>>
>
> If you set the stripe_cache_size high enough you can strangle the
> system.  Do you really need 384MiB of raid cache?

The weird thing is, with md/RAID-5, I never had a problem.

Justin.

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