Re: [PATCH] Configurable reclaim batch size

Balbir Singh
2007-09-17T20:48:28Z

Peter Zijlstra wrote:
> On Mon, 17 Sep 2007 10:54:59 -0700 (PDT) Christoph Lameter
> <clameter@sgi.com> wrote:
>
>> On Sat, 15 Sep 2007, Peter Zijlstra wrote:
>>
>>> It increases the lock hold times though. Otoh it might work out with the
>>> lock placement.
>> Yeah may be good for NUMA.
>
> Might, I'd just like a _little_ justification for an extra tunable.
>
>>> Do you have any numbers that show this is worthwhile?
>> Tried to run AIM7 but the improvements are in the noise. I need a tests
>> that really does large memory allocation and stresses the LRU. I could
>> code something up but then Lee's patch addresses some of the same issues.
>> Is there any standard test that shows LRU handling regressions?
>
> hehe, I wish. I was just hoping you'd done this patch as a result of an
> actual problem and not a hunch.

Please do let me know if someone finds a good standard test for it or a
way to stress reclaim. I've heard AIM7 come up often, but never been
able to push it much. I should retry.

--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL