From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 15 Jan 2002 11:22:44 +0000 From: "Stephen C. Tweedie" Subject: Re: [PATCH] page coloring for 2.4.17 kernel Message-ID: <20020115112244.C2595@redhat.com> References: <3.0.6.32.20020113204610.007c7a60@boo.net> <3.0.6.32.20020113204610.007c7a60@boo.net> <20020114224603.N5057@redhat.com> <3.0.6.32.20020114235555.007bfac0@boo.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3.0.6.32.20020114235555.007bfac0@boo.net>; from jasonp@boo.net on Mon, Jan 14, 2002 at 11:55:55PM -0500 Sender: owner-linux-mm@kvack.org Return-Path: To: Jason Papadopoulos Cc: "Stephen C. Tweedie" , linux-mm@kvack.org List-ID: 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/