Re: [Bug 3268] New: Lowmemory exhaustion problem with v2.6.8.1-mm4 16gb

[Andrew Morton <akpm@osdl.org>]

bugme-daemon@osdl.org wrote:
>
> http://bugme.osdl.org/show_bug.cgi?id=3268
> 
>            Summary: Lowmemory exhaustion problem with v2.6.8.1-mm4 16gb
>     Kernel Version:  2.6.8.1-mm4
>             Status: NEW
>           Severity: high
>              Owner: akpm@digeo.com
>          Submitter: kmannth@us.ibm.com
>                 CC: mbligh@aracnet.com
> 
> 
> Distribution:  SuSE SLES9 base
> Hardware Environment:  IBM x445 8-way  32gb and 16 gb 
> Software Environment:   2.6.8.1-mm4
> Problem Description:  I run out of lowmemory very easily using /dev/shm/
> I have 64g and Numa/Discontig enabled in my kernel.  
> 
> Steps to reproduce:  Fill up 1/2 or more of /dev/shm (on my system it is about
> 1/3-1/2 of my total system memory) with lots of kernel builds.  Observe system
> breakdown.  (If you want the script I will email it to you).  I have seen this
> with both 32 gigs and 16 gigs...
> 
> For example if I boot with 16gb and I start 45 kernel builds in /dev/shm they
> system take about 30-60 seconds to run out of lowmemory.  
> The oom killer comes in and starts shutting down processes.  The system is unsuable.
>   There is tons of highmem left but no lowmem.  Is there something about
> /dev/shm that might cause this? 
> 
> I turned some various vm debug optoins that printed out some info that I will
> attach.  I will attach the config file and as much of the kernel messages as I
> can.

I assume this is because we're using up all of lowmem with filesystem metadata.

Hugh?
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