Re: [RFC PATCH 0/4]: affinity-on-next-touch

[Stefan Lankes]

Brice Goglin wrote:
> Lee Schermerhorn wrote:
> > On Wed, 2009-06-17 at 09:45 +0200, Stefan Lankes wrote:
> >   
> >
> > Today I rebased the migrate on fault patches to 2.6.30-mmotm-090612...
> > [along with my shared policy series atop which they sit in my tree].
> > Patches reside in:
> >
> > http://free.linux.hp.com/~lts/Patches/PageMigration/2.6.30-mmotm-090612-1220/
> >
> >   
>
> I gave this patchset a try and indeed it seems to work fine, thanks a
> lot. But the migration performance isn't very good. I am seeing about
> 540MB/s when doing mbind+touch_all_pages on large buffers on a
> quad-barcelona machines. move_pages gets 640MB/s there. And my own
> next-touch implementation were near 800MB/s in the past.

I used a modified stream benchmark to evaluate the performance of Lee's 
and my version of the next-touch implementation. In this low-level 
benchmark is Lee's patch better than my patch. I think that Brice and I 
use the same technique to realize affinity-on-next-touch. Do you use 
another kernel version to evaluate the performance?

Stefan

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