From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="iso-8859-1" From: Daniel Phillips Subject: Re: [PATCH] (2/2) reverse mappings for current 2.5.23 VM Date: Wed, 19 Jun 2002 19:01:23 +0200 References: In-Reply-To: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Message-Id: Sender: owner-linux-mm@kvack.org Return-Path: To: Rik van Riel , Craig Kulesa Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Wednesday 19 June 2002 13:58, Rik van Riel wrote: > > 2.5.22 vanilla: > > Total kernel swapouts during test = 29068 kB > > Total kernel swapins during test = 16480 kB > > Elapsed time for test: 141 seconds > > > > 2.5.23-rmap (this patch -- "rmap-minimal"): > > Total kernel swapouts during test = 24068 kB > > Total kernel swapins during test = 6480 kB > > Elapsed time for test: 133 seconds > > > > 2.5.23-rmap13b (Rik's "rmap-13b complete") : > > Total kernel swapouts during test = 40696 kB > > Total kernel swapins during test = 380 kB > > Elapsed time for test: 133 seconds > > Interesting to see that both rmap versions have the same > performance, it would seem that swapouts are much cheaper > than waiting for a pagefault to swap something in ... You might conclude from the above that the lru+rmap is superior to aging+rmap: while they show the same wall-clock time, lru+rmap consumes considerably less disk bandwidth. Naturally, it would be premature to conclude this from one trial on one load. These patches need benchmarking - lots of it, and preferrably in the next few days. We need to see cpu stats as well. -- Daniel -- 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/