Re: [patch] Reset the high water marks in CPUs pcp list

Rohit Seth
2005-09-29T01:12:56Z

On Wed, 2005-09-28 at 14:56 -0700, Christoph Lameter wrote:
> On Wed, 28 Sep 2005, Rohit Seth wrote:
>
> > On Wed, 2005-09-28 at 14:09 -0700, Christoph Lameter wrote:
> > > On Wed, 28 Sep 2005, Rohit Seth wrote:
> > >
> > > > CONFIG_NUMA needs to be defined for that. And then too for flushing the
> > > > remote pages. Also, when are you flushing the local pcps. Also note
> > > > that this patch is just bringing the free pages on the pcp list closer
> > > > to what used to be the number earlier.
> > >
> > > What was the reason for the increase of those numbers?
> > Bugger batch size to possibly get more physical contiguous pages. That
> > indirectly increased the high water marks for the pcps.
>
> I know that Jack and Nick did something with those counts to insure that
> page coloring effects are avoided. Would you comment?
>

About 10% performance variation was seen from run to run with original
setting with certain workloads on x86 and IA-64 platforms. And this
variation came down to about 2% with new settings.

-rohit