Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262124AbVATPSt (ORCPT ); Thu, 20 Jan 2005 10:18:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262085AbVATPSt (ORCPT ); Thu, 20 Jan 2005 10:18:49 -0500 Received: from mail.joq.us ([67.65.12.105]:5560 "EHLO sulphur.joq.us") by vger.kernel.org with ESMTP id S262124AbVATPSq (ORCPT ); Thu, 20 Jan 2005 10:18:46 -0500 To: Con Kolivas Cc: linux , Ingo Molnar , rlrevell@joe-job.com, paul@linuxaudiosystems.com, CK Kernel , utz , Andrew Morton , alexn@dsv.su.se, Rui Nuno Capela Subject: Re: [PATCH]sched: Isochronous class v2 for unprivileged soft rt scheduling References: <41EEE1B1.9080909@kolivas.org> <41EF00ED.4070908@kolivas.org> <873bwwga0w.fsf@sulphur.joq.us> <41EF123D.703@kolivas.org> <87ekgges2o.fsf@sulphur.joq.us> <41EF2E7E.8070604@kolivas.org> <87oefkd7ew.fsf@sulphur.joq.us> <41EF48BA.50709@kolivas.org> <41EF5122.2000605@kolivas.org> From: "Jack O'Quin" Date: Thu, 20 Jan 2005 09:19:37 -0600 In-Reply-To: <41EF5122.2000605@kolivas.org> (Con Kolivas's message of "Thu, 20 Jan 2005 17:35:14 +1100") Message-ID: <87pt00b01i.fsf@sulphur.joq.us> User-Agent: Gnus/5.1006 (Gnus v5.10.6) XEmacs/21.4 (Corporate Culture, linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1230 Lines: 35 Con Kolivas writes: >> Jack O'Quin wrote: >>> You're really getting hammered with those periodic 6 msec delays, >>> though. The basic audio cycle is only 1.45 msec. > Con Kolivas wrote: >> As you've already pointed out, though, they occur even with >> SCHED_FIFO so I'm certain it's an artefact unrelated to cpu >> scheduling. Yes. Your scheduler works well. > Ok to try and answer my own possibility I) remounted reiserfs with the > nolog option and tested with SCHED_ISO That's discouraging about reiserfs. Is it version 3 or 4? Earlier versions showed good realtime responsiveness for audio testers. It had a reputation for working much better at lower latency than ext3. How do we report this problem to the developers? > That the 20s periodic thing delay has all but gone. Just one towards > the end (no idea what that was). I need to figure out how to use Takashi's ALSA xrun debugger. It prints the kernel stack when an xrun occurs. -- joq - 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/