From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 25 Sep 2000 16:11:34 +0200 From: Jens Axboe Subject: Re: [patch] vmfixes-2.4.0-test9-B2 Message-ID: <20000925161134.S26339@suse.de> References: <20000925145856.A13011@athlon.random> <20000925154952.O26339@suse.de> <20000925162009.K22882@athlon.random> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20000925162009.K22882@athlon.random>; from andrea@suse.de on Mon, Sep 25, 2000 at 04:20:09PM +0200 Sender: owner-linux-mm@kvack.org Return-Path: To: Andrea Arcangeli Cc: Ingo Molnar , Linus Torvalds , Rik van Riel , Roger Larsson , MM mailing list , linux-kernel@vger.kernel.org List-ID: On Mon, Sep 25 2000, Andrea Arcangeli wrote: > > And a new elevator was introduced some months ago to solve this. > > And now that I done some benchmark it seems the major optimization consists in > the implementation of the new _ordering_ algorithm in test2, not really from > the removal of the more finegrined latency control (said that I'm not going to > reintroduce the previous latency control, the current one doesn't provide > great latency but it's ok). Yes, I found this the greatest improvement too. > As soon I patch my tree with Peter's perfect CSCAN ordering (that only changes > the ordering algorithm), tiotest performance drops significantly in the > 2-thread-reading case. elvtune settings doesn't matter, that's only a matter > of the ordering. Interesting. I haven't done any serious benching with the CSCAN introduction in elevator_linus, I'll try that too. -- * Jens Axboe * SuSE Labs -- 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.eu.org/Linux-MM/