Re: [Ext2-devel] Re: OOM problems on 2.6.12-rc1 with many fsx tests

[Badari Pulavarty <pbadari@us.ibm.com>]

Mingming Cao wrote:

> On Sat, 2005-03-26 at 16:23 -0800, Mingming Cao wrote:
> 
>>On Fri, 2005-03-25 at 14:11 -0800, Badari Pulavarty wrote:
>>
>>>On Fri, 2005-03-25 at 13:56, Andrew Morton wrote:
>>>
>>>>Mingming Cao <cmm@us.ibm.com> wrote:
>>>>
>>>>>I run into OOM problem again on 2.6.12-rc1. I run some(20) fsx tests on
>>>>>2.6.12-rc1 kernel(and 2.6.11-mm4) on ext3 filesystem, after about 10
>>>>>hours the system hit OOM, and OOM keep killing processes one by one. I
>>>>>could reproduce this problem very constantly on a 2 way PIII 700MHZ with
>>>>>512MB RAM. Also the problem could be reproduced on running the same test
>>>>>on reiser fs.
>>>>>
>>>>>The fsx command is:
>>>>>
>>>>>./fsx -c 10 -n -r 4096 -w 4096 /mnt/test/foo1 &
>>>>
>>>>I was able to reproduce this on ext3.  Seven instances of the above leaked
>>>>10-15MB over 10 hours.  All of it permanently stuck on the LRU.
>>>>
>>>>I'll continue to poke at it - see what kernel it started with, which
>>>>filesystems it affects, whether it happens on UP&&!PREEMPT, etc.  Not a
>>>>quick process.
>>>
>>>I reproduced *similar* issue with 2.6.11. The reason I say similar, is
>>>there is no OOM kill, but very low free memory and machine doesn't
>>>respond at all. (I booted my machine with 256M memory and ran 20 copies
>>>of fsx on ext3).
>>>
>>>
>>
>>Yes, I re-run the same test on 2.6.11 for 24 hours, like Badari see on
>>his machine, my machine did not go to OOM on 2.6.11,still alive, but
>>memory is very low(only 5M free). Killed all fsx and umount the ext3
>>filesystem did not bring back much memory. I will going to rerun the
>>tests without the mapped read/write to see what happen.
>>
>>
> 
> 
> Run fsx tests without mapped IO on 2.6.11 seems fine.  Here is
> the /proc/meminfo after 18 hours run:

Mingming, Reproduce it on 2.6.11 with mapped IO tests. That will tell
us when the regression started.

Thanks,
Badari