From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266248AbUGJNyx (ORCPT ); Sat, 10 Jul 2004 09:54:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266249AbUGJNyx (ORCPT ); Sat, 10 Jul 2004 09:54:53 -0400 Received: from mx1.elte.hu ([157.181.1.137]:60905 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S266248AbUGJNyv (ORCPT ); Sat, 10 Jul 2004 09:54:51 -0400 Date: Sat, 10 Jul 2004 15:55:55 +0200 From: Ingo Molnar To: ismail =?iso-8859-1?Q?d=F6nmez?= Cc: Redeeman , LKML Mailinglist , Arjan van de Ven Subject: Re: [announce] [patch] Voluntary Kernel Preemption Patch Message-ID: <20040710135555.GA31068@elte.hu> References: <20040709182638.GA11310@elte.hu> <1089407610.10745.5.camel@localhost> <20040710080234.GA25155@elte.hu> <20040710085044.GA14262@elte.hu> <2a4f155d040710035512f21d34@mail.gmail.com> <20040710123520.GA27278@elte.hu> <2a4f155d04071005585b5d8999@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <2a4f155d04071005585b5d8999@mail.gmail.com> User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=0, required 5.9, autolearn=not spam X-ELTE-SpamLevel: X-ELTE-SpamScore: 0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * ismail dönmez wrote: > > what filesystem are you using? > > > > XFS i've fixed latencies in ext3, i'm not sure how bad XFS is. But 2-3 seconds delay is almost impossible to be a true scheduling latency - it's probably IO latency impacting your audio application. (it could also be normal preemption latency, if those tasks are not running as SCHED_FIFO - but 2-3 seconds preemption latency should not be caused by a simple cp -a. This leaves IO latency.). Ingo