linux-kernel - Re: Small System Paging Problem

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Date:	Mon, 26 Nov 2007 16:55:38 +0000
From:	Pavel Machek <pavel@....cz>
To:	Josh Goldsmith <joshin@...mail.com>
Cc:	Mikael Pettersson <mikpe@...uu.se>, linux-kernel@...r.kernel.org
Subject: Re: Small System Paging Problem - OOM-killer goes nuts

On Sun 2007-11-25 22:28:03, Josh Goldsmith wrote:
> Thanks for the response Mikael.
> 
> Is your 486 running a IDE disk on a normal interface or 
> via USB?  I wonder if the NSLU2 only having I/O via USB 
> might be significant.  Also, this is a 2.6 kernel and 

I'd suspect USB is significant here. Talk to Olivier Neukum (sp?),iirc
he was trying to fix swapping over usb.

							Pavel

> >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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