From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265987AbUGMV0c (ORCPT ); Tue, 13 Jul 2004 17:26:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265985AbUGMV0b (ORCPT ); Tue, 13 Jul 2004 17:26:31 -0400 Received: from fw.osdl.org ([65.172.181.6]:33766 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S265946AbUGMV0X (ORCPT ); Tue, 13 Jul 2004 17:26:23 -0400 Date: Tue, 13 Jul 2004 14:29:23 -0700 From: Andrew Morton To: Lee Revell Cc: andrea@suse.de, linux-audio-dev@music.columbia.edu, linux-kernel@vger.kernel.org, Takashi Iwai Subject: Re: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch Message-Id: <20040713142923.568fa35e.akpm@osdl.org> In-Reply-To: <1089744137.20381.49.camel@mindpipe> References: <20040712163141.31ef1ad6.akpm@osdl.org> <200407130001.i6D01pkJ003489@localhost.localdomain> <20040712170844.6bd01712.akpm@osdl.org> <20040713162539.GD974@dualathlon.random> <1089744137.20381.49.camel@mindpipe> X-Mailer: Sylpheed version 0.9.7 (GTK+ 1.2.10; i586-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Lee Revell wrote: > > Would this explain these? When running JACK with settings that need > sub-millisecond latencies, I get them when I generate any load at all on > the system (typing, switching windows, etc). I also get lots of these > if I run JACK from an X terminal, but very few if I run it from a text > console, even if X is running in the background. > > Jul 13 14:36:16 mindpipe kernel: ALSA /usr/src/alsa-cvs-1.0.5/alsa-driver/alsa-kernel/core/pcm_lib.c:199: Unexpected hw_pointer value [1] (stream = 0, delta: -25, max jitter = 32): wrong interrupt acknowledge? I'm wondering what this message actually means. "Unexpected hw_pointer value"? Does this actually indicate an underrun, or is the debug code screwy?