Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752138AbZDCEST (ORCPT ); Fri, 3 Apr 2009 00:18:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751442AbZDCESI (ORCPT ); Fri, 3 Apr 2009 00:18:08 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:59490 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751419AbZDCESF (ORCPT ); Fri, 3 Apr 2009 00:18:05 -0400 Date: Thu, 2 Apr 2009 21:13:19 -0700 (PDT) From: Linus Torvalds X-X-Sender: torvalds@localhost.localdomain To: Lennart Sorensen , Jens Axboe cc: Ingo Molnar , Andrew Morton , tytso@mit.edu, drees76@gmail.com, jesper@krogh.cc, Linux Kernel Mailing List Subject: Re: Linux 2.6.29 In-Reply-To: <20090403040649.GF3795@csclub.uwaterloo.ca> Message-ID: References: <20090325220530.GR32307@mit.edu> <20090326171148.9bf8f1ec.akpm@linux-foundation.org> <20090326174704.cd36bf7b.akpm@linux-foundation.org> <20090326182519.d576d703.akpm@linux-foundation.org> <20090401210337.GB3797@csclub.uwaterloo.ca> <20090401143622.b1885643.akpm@linux-foundation.org> <20090402010044.GA16092@elte.hu> <20090403040649.GF3795@csclub.uwaterloo.ca> User-Agent: Alpine 2.00 (LFD 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1505 Lines: 40 Jens - remind us what the problem with AS was wrt CFQ? There's some write throttling in CFQ, maybe it has some really broken case? Linus On Fri, 3 Apr 2009, Lennart Sorensen wrote: > On Thu, Apr 02, 2009 at 03:00:44AM +0200, Ingo Molnar wrote: > > I'll test this (and the other suggestions) once i'm out of the merge > > window. > > > > I probably wont test that though ;-) > > > > Going back to v2.6.14 to do pre-mutex-merge performance tests was > > already quite a challenge on modern hardware. > > Well after a day of running my mythtv box with anticipatiry rather than > the default cfq scheduler, it certainly looks a lot better. I haven't > seen any slowdowns, the disk activity light isn't on solidly (it just > flashes every couple of seconds instead), and it doesn't even mind > me lanuching bittornado on multiple torrents at the same time as two > recordings are taking place and some commercial flagging is taking place. > With cfq this would usually make the system unusable (and a Q6600 with > 6GB ram should never be unresponsive in my opinion). > > So so far I would rank anticipatory at about 1000x better than cfq for > my work load. It sure acts a lot more like it used to back in 2.6.18 > times. > > -- > Len Sorensen > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/