Overcommit (OOM) problem on embedded device (PPChameleon)

[Eugene Surovegin]

On Tue, Mar 29, 2005 at 09:30:57PM +0200, Martin Egholm Nielsen wrote:

[snip]

> Specs:
> I'm having an embedded Linux system running on a PPC405EP (PPChameleon)
> with 64 megs of RAM, some flash, but (ofcourse) no swap space. It runs a
> 2.4.20 kernel patched with drivers for my device.
> 
> Problem:
> I have an application that is killed by the OOM (I guess) when it tries
> to "use" more memory than present on the system.
> Bolied down, memory is allocated with "sbrk" and then touch'ed (see
> test-application below).

[snip]

> However, both my desktop Linux (RH 7.3)/2.4.18-10/i386 and Linux
> (FC2)/2.6.5/i386 did what I expected:

Well, the only way to get the same results is to use the _same_ linux 
kernel version and have the _same_ hw configuration (e.g. memory 
configuration).

There were quite a few changes to VM during 2.4 lifetime; 2.6 is 
different from 2.4 in the memory management area. RH kernel is 
probably patched as hell, so who knows what VM it has.

--
Eugene