Re: Small System Paging Problem - OOM-killer goes nuts
- From: Mikael Pettersson <mikpe@xxxxxxxx>
- Date: Sun, 25 Nov 2007 23:55:48 +0100 (MET)
On Sun, 25 Nov 2007 15:02:15 -0700, Josh Goldsmith wrote:
I have a Linksys NSLU2 running 2.6.21 (I can replicate the problem on
2.6.23 but it isn't fully supported on SlugOS). It is a armv5teb device
with 32MB of RAM, 400+ MB swap on its 160GB USB2 root disk. The machine is
used as a fileserver and to build packages for other ARM devices. It may be
underpowered by today's standard but is a whole lot faster than my first
Linux system (386sx20 with 4MB RAM) but the whole system with disk uses <8
watts and is silent.
The problem comes when I try to untar a large file (in this case
linux-2.6.23.tar.bz2). Regardless if I kill off every other process,
eventually the oom-killer will appear and kill either the tar or the shell.
I've tried every tuning option I and my buddy Google could find including
(/proc/sys/vm/overcommit*) with no success. I'm not worried about paging
impacting performance.
I'd appreciate any help, pointers, or gentle taps with the cluebat.
I'm no VM tuning expert, but I have and still do heavy compile
jobs on similarly configured machines, with no OOM problems:
I regularly build 2.6 kernels and occasionally also gcc on a
100MHz 486 with 28MB of RAM and perhaps 500MB of swap. It runs
a standard but stripped down Fedora Core 4 user-space, with ext3
file systems and a kernel that doesn't include anything non-essential.
The machine will swap madly, but the OOM killer never triggers.
(All system settings are FC4 defaults. I haven't touched them.)
In the past I did a fair amount of package rebuilds and test suite
runs on an NSLU2 myself, with a 2.4 Linksys/Openslug kernel, ext3,
and a 1GB or perhaps 2GB swap partition on a disk attached via a
USB2-to-PATA enclosure. Even when swapping heavily the OOM killer
wouldn't trigger.
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