From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755068AbYIQVeo (ORCPT ); Wed, 17 Sep 2008 17:34:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753340AbYIQVeg (ORCPT ); Wed, 17 Sep 2008 17:34:36 -0400 Received: from casper.infradead.org ([85.118.1.10]:32809 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753193AbYIQVef (ORCPT ); Wed, 17 Sep 2008 17:34:35 -0400 Date: Wed, 17 Sep 2008 14:34:39 -0700 From: Arjan van de Ven To: Sitsofe Wheeler Cc: linux-kernel@vger.kernel.org, Ingo Molnar Subject: Re: How how latent should non-preemptive scheduling be? Message-ID: <20080917143439.5ce79534@infradead.org> In-Reply-To: <48D1741A.7010508@yahoo.com> References: <48D1741A.7010508@yahoo.com> Organization: Intel X-Mailer: Claws Mail 3.5.0 (GTK+ 2.12.11; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 17 Sep 2008 22:18:18 +0100 Sitsofe Wheeler wrote: > Hi, > > I have an EeePC 900 (Intel Celeron 900Mhz) and it seems to be > skipping while playing sound through various desktop apps with a > 2.6.27rc6 kernel. It is running off an SD card which really shows up > slow writes but the sound is seemingly skipping even when ext3 is not > being used. When look at latencytop I often see results similar to > this: > > > Cause Maximum > > Percentage Scheduler: waiting for cpu 247.2 > > msec 64.6 % futex_wait do_futex sys_futex > > sysenter_do_call 5.0 msec 24.8 % do_select > > core_sys_select sys_select sysenter_do_c 4.7 msec 0.7 % > > do_sys_poll sys_poll sysenter_do_call 4.5 this says you haven't done "make install" on the latencytop directory so it's not translating things for you.. can you do that please?