Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757273AbYBOQuw (ORCPT ); Fri, 15 Feb 2008 11:50:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754634AbYBOQuq (ORCPT ); Fri, 15 Feb 2008 11:50:46 -0500 Received: from Mail.MNSU.EDU ([134.29.1.12]:57250 "EHLO mail.mnsu.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754432AbYBOQup (ORCPT ); Fri, 15 Feb 2008 11:50:45 -0500 X-Greylist: delayed 1661 seconds by postgrey-1.27 at vger.kernel.org; Fri, 15 Feb 2008 11:50:45 EST Message-ID: <47B5BC35.1000700@mnsu.edu> Date: Fri, 15 Feb 2008 10:22:13 -0600 From: "Jeffrey E. Hundstad" User-Agent: Mozilla-Thunderbird 2.0.0.9 (X11/20080110) MIME-Version: 1.0 To: Lukas Hejtmanek CC: Jan Engelhardt , "linux-kernel@vger.kernel.org" Subject: Re: Disk schedulers References: <20080214162104.GA5347@ics.muni.cz> <20080215155922.GD4269@ics.muni.cz> In-Reply-To: <20080215155922.GD4269@ics.muni.cz> Content-Type: text/plain; charset=ISO-8859-2; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1329 Lines: 41 Lukas Hejtmanek, I have to say, that I've heard this subject before, the summary answer seems to be, that the kernel can not guess the wishes of the user 100% of the time. If you have a low priority I/O task use ionice(1) to set the priority of that task so it doesn't nuke your high priority task. I have to personal stake in this answer but I can report that for my high I/O tasks it does work like a charm. -- Jeffrey Hundstad Lukas Hejtmanek wrote: > On Fri, Feb 15, 2008 at 03:42:58PM +0100, Jan Engelhardt wrote: > >> Also consider >> - DMA (e.g. only UDMA2 selected) >> - aging disk >> > > it's not the case. > > hdparm reports udma5 is used, if it is reliable with libata. > > The disk is 3 months old, kernel does not report any errors. And it has never > been different. > > -- > Luk?? Hejtm?nek > -- > 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/ > -- 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/