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

[Rohit Seth]

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

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