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

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

Badari Pulavarty wrote:

> 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.

Sorry - Ignore my request, Mingming already did this work and posted
the result.

Thanks,
Badari