Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756204AbZDFRB2 (ORCPT ); Mon, 6 Apr 2009 13:01:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751452AbZDFRBT (ORCPT ); Mon, 6 Apr 2009 13:01:19 -0400 Received: from brick.kernel.dk ([93.163.65.50]:45388 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750869AbZDFRBT (ORCPT ); Mon, 6 Apr 2009 13:01:19 -0400 Date: Mon, 6 Apr 2009 19:01:16 +0200 From: Jens Axboe To: Linus Torvalds Cc: Linux Kernel Mailing List , tytso@mit.edu Subject: Re: [PATCH 0/8][RFC] IO latency/throughput fixes Message-ID: <20090406170116.GH5178@kernel.dk> References: <1239022088-29002-1-git-send-email-jens.axboe@oracle.com> <20090406151054.GD5178@kernel.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1547 Lines: 40 On Mon, Apr 06 2009, Linus Torvalds wrote: > > > On Mon, 6 Apr 2009, Jens Axboe wrote: > > > > > Jens - I can just apply this queue (I want to test it out anyway), or if > > > you prefer I can pull from you. Just tell me. > > > > Whatever you want, if you want to pull instead of manually applying, > > it's: > > > > git://git.kernel.dk/linux-2.6-block.git blk-latency > > Ok, I applied them for testing anyway, so I think I'll just keep the > series I have in my tree. I'm keeping my nasty "dd+sync" going in the No problem, the end result should be identical :-) > background, just to verify that things really feel better, but I'm already > convinced this is a winner. Especially with the request size limiter, I > can really read email _almost_ as if nothing else was going on on the > machine. > > With that request size limiting, my fsync pauses tend to be in the 250ms > range, with a one 0.75s outlier in the last few minutes. I can definitely > feel that quarter-second thing, and the .75s pause was a real stutter, but > boy what a difference. I don't get the uncontrollable urge to kill that > nasty background writer any more. If we can make the dd writer almost unnoticable, then I think we've come a long way already. That really is a nasty workload. -- Jens Axboe -- 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/