linux-kernel - Re: 2.6.20-rc5: cp 18gb 18gb.2 = OOM killer, reproducible just like 2.16.19.2

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Message-ID: <Pine.LNX.4.64.0701251921430.30148@p34.internal.lan>
Date:	Thu, 25 Jan 2007 19:22:04 -0500 (EST)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Mark Hahn <hahn@...aster.ca>
cc:	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org, xfs@....sgi.com
Subject: Re: 2.6.20-rc5: cp 18gb 18gb.2 = OOM killer, reproducible just like
 2.16.19.2



On Thu, 25 Jan 2007, Mark Hahn wrote:

> > Something is seriously wrong with that OOM killer.
> 
> do you know you don't have to operate in OOM-slaughter mode?
> 
> "vm.overcommit_memory = 2" in your /etc/sysctl.conf puts you into a mode where
> the kernel tracks your "committed" memory needs, and will eventually cause
> some allocations to fail.
> this is often much nicer than the default random OOM slaughter.
> (you probably also need to adjust vm.overcommit_ratio with some knowlege of
> your MemTotal and SwapTotal.)
> 
> regards, mark hahn.
> -
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> 
> 

# sysctl -a | grep vm.over
vm.overcommit_ratio = 50
vm.overcommit_memory = 0

I'll have to experiment with these options, thanks for the info!

Justin.
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