Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161204AbWAHWLs (ORCPT ); Sun, 8 Jan 2006 17:11:48 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161221AbWAHWLs (ORCPT ); Sun, 8 Jan 2006 17:11:48 -0500 Received: from mx02.stofanet.dk ([212.10.10.12]:4225 "EHLO mx02.stofanet.dk") by vger.kernel.org with ESMTP id S1161204AbWAHWLr (ORCPT ); Sun, 8 Jan 2006 17:11:47 -0500 Message-ID: <43C18E09.9060600@stud.feec.vutbr.cz> Date: Sun, 08 Jan 2006 23:11:21 +0100 From: Michal Schmidt User-Agent: Mozilla Thunderbird 1.0 (X11/20041207) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Mark Knecht CC: Jan Engelhardt , Linux Kernel Mailing List , Ingo Molnar , Lee Revell Subject: Re: 2.6.15-rt2 - repeatable xrun - no good data in trace References: <5bdc1c8b0601081252x59190f1ajcb5514364d78a4e@mail.gmail.com> <43C17E50.4060404@stud.feec.vutbr.cz> <5bdc1c8b0601081404n2a163ce1ya21919800546dfc8@mail.gmail.com> In-Reply-To: <5bdc1c8b0601081404n2a163ce1ya21919800546dfc8@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1345 Lines: 32 Mark Knecht wrote: > On 1/8/06, Jan Engelhardt wrote: >>>> I did run across a way that I can create a repeatable xrun on my >>>>AMD64 machine by burning a CD in k3b while Jack is running. >>>>Unfortunately I do not see any good trace data in dmesg when I do it. >>>Maybe your cdrecord is running with realtime priority higher than Jack? >>>Michal >>cdrecord does run with SCHED_RR/99 when started with proper privileges. >> > Ah, then it's likely that this isn't a real problem and it would be > expected to cause an xrun? By running cdrecord with a higher priority than Jack, you're telling the system that burning the CD is more important than not getting xruns in Jack. > Anyway, it seems strange that the trace doesn't show anything. I > suppose that's because cdrecord just grabs a lot of time at a higher > priority than Jack and Jack ends up not getting serivces at all for > 5-10mS? I guess that's exactly what's happening. > OK, back to the drawing board about debugging my problems! Try running cdrecord as a normal user and don't give it SUID root. Michal - 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/