Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754680AbXFWWWH (ORCPT ); Sat, 23 Jun 2007 18:22:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752492AbXFWWV4 (ORCPT ); Sat, 23 Jun 2007 18:21:56 -0400 Received: from srv5.dvmed.net ([207.36.208.214]:40796 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752640AbXFWWVz (ORCPT ); Sat, 23 Jun 2007 18:21:55 -0400 Message-ID: <467D9CFD.7020603@garzik.org> Date: Sat, 23 Jun 2007 18:21:49 -0400 From: Jeff Garzik User-Agent: Thunderbird 1.5.0.12 (X11/20070530) MIME-Version: 1.0 To: Andrew Morton CC: Carlo Wood , Henrique de Moraes Holschuh , Arjan van de Ven , linux-kernel@vger.kernel.org Subject: Re: SATA Harddisk speed drop of 100 MB/s References: <20070620224847.GA5488@alinoe.com> <4679B2DE.9090903@garzik.org> <1182397012.2863.0.camel@laptopd505.fenrus.org> <20070622162142.GA603@alinoe.com> <20070622211746.GB21769@khazad-dum.debian.net> <20070622212758.GA6970@alinoe.com> <20070623013132.GA1702@khazad-dum.debian.net> <20070623025906.GA24336@alinoe.com> <20070623102949.09e36fb9.akpm@linux-foundation.org> In-Reply-To: <20070623102949.09e36fb9.akpm@linux-foundation.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -4.3 (----) X-Spam-Report: SpamAssassin version 3.1.9 on srv5.dvmed.net summary: Content analysis details: (-4.3 points, 5.0 required) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 754 Lines: 22 Andrew Morton wrote: > Please see http://bugzilla.kernel.org/show_bug.cgi?id=8636 > > In that report a pretty large slowdown with CFQ has been identified. > Jens has plunked a patch in there (Comment #50) and then ran away on > vacation. > > If someone can test that patch and demonstrate its goodness, I'll > queue it up, thanks. This has unfortunately split up into two threads. I identified the root cause of the slowdown as NCQ in the thread "Re: SATA RAID5 speed drop of 100 MB/s" on LKML. Jeff - 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/