Re: [PATCH] Configurable reclaim batch size

Peter Zijlstra
2007-09-17T19:57:31Z

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.