Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761144AbZDAW5t (ORCPT ); Wed, 1 Apr 2009 18:57:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757469AbZDAW5k (ORCPT ); Wed, 1 Apr 2009 18:57:40 -0400 Received: from caffeine.csclub.uwaterloo.ca ([129.97.134.17]:56938 "EHLO caffeine.csclub.uwaterloo.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757304AbZDAW5k (ORCPT ); Wed, 1 Apr 2009 18:57:40 -0400 Date: Wed, 1 Apr 2009 18:57:38 -0400 To: Andrew Morton Cc: torvalds@linux-foundation.org, tytso@mit.edu, drees76@gmail.com, jesper@krogh.cc, linux-kernel@vger.kernel.org Subject: Re: Linux 2.6.29 Message-ID: <20090401225737.GC3797@csclub.uwaterloo.ca> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090401143622.b1885643.akpm@linux-foundation.org> User-Agent: Mutt/1.5.18 (2008-05-17) From: lsorense@csclub.uwaterloo.ca (Lennart Sorensen) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1304 Lines: 30 On Wed, Apr 01, 2009 at 02:36:22PM -0700, Andrew Morton wrote: > Back in 2002ish I did a *lot* of work on IO latency, reads-vs-writes, > etc, etc (but not fsync - for practical purposes it's unfixable on > ext3-ordered) > > Performance was pretty good. From some of the descriptions I'm seeing > get tossed around lately, I suspect that it has regressed. > > It would be useful/interesting if people were to rerun some of these > tests with `echo anticipatory > /sys/block/sda/queue/scheduler'. > > Or with linux-2.5.60 :( Well 2.6.18 seems to keep popping up as the last kernel with "sane" behaviour, at least in terms of not causing huge delays under many workloads. I currently run 2.6.26, although that could be updated as soon as I get around to figuring out why lirc isn't working for me when I move past 2.6.26. I could certainly try changing the scheduler on my mythtv box and seeing if that makes any difference to the behaviour. It is pretty darn obvious whether it is responsive or not when starting to play back a video. -- 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/