Re: [PATCH] page coloring for 2.4.17 kernel

["Stephen C. Tweedie" <sct@redhat.com>]

Hi,

On Mon, Jan 14, 2002 at 11:55:55PM -0500, Jason Papadopoulos wrote:
> At 10:46 PM 1/14/02 +0000, you wrote:
> 
> >> Hello. Please be patient with this, my first post to linux-mm.
> >> The included patch modifies the free list in the 2.4.17 kernel
> >> to support round-robin page coloring. It seems to work okay
> >> on an Alpha and speeds up a lot of number-crunching code I
> >> have lying around (lmbench reports some higher bandwidths too).
> >> The patch is a port of the 2.2.20 version that I recently posted
> >> to the linux kernelmailing list.
> >
> >Do you have numbers to show the sort of performance difference it
> >makes?
> 
> It's a little difficult to tell with lmbench, since results can vary 
> slightly from run to run.

That's an important aspect.  Page colouring can often drastically
reduce the variance in run times for cache-intensive tasks.  Average
and variance are both very much worth reporting.

Cheers,
 Stephen
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/