Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262062AbVATGed (ORCPT ); Thu, 20 Jan 2005 01:34:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262063AbVATGed (ORCPT ); Thu, 20 Jan 2005 01:34:33 -0500 Received: from mail06.syd.optusnet.com.au ([211.29.132.187]:8629 "EHLO mail06.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S262062AbVATGea (ORCPT ); Thu, 20 Jan 2005 01:34:30 -0500 Message-ID: <41EF5122.2000605@kolivas.org> Date: Thu, 20 Jan 2005 17:35:14 +1100 From: Con Kolivas User-Agent: Mozilla Thunderbird 1.0 (X11/20041206) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Con Kolivas Cc: "Jack O'Quin" , 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> In-Reply-To: <41EF48BA.50709@kolivas.org> 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: 1793 Lines: 51 Con Kolivas wrote: > Jack O'Quin wrote: >> I was misreading the x-axis. They're actually every 20 sec. My >> system isn't doing that. > > > Possibly reiserfs journal related. That has larger non-preemptible code > sections. > >> You're really getting hammered with those periodic 6 msec delays, >> though. The basic audio cycle is only 1.45 msec. > > > 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. Ok to try and answer my own possibility I remounted reiserfs with the nolog option and tested with SCHED_ISO ********************************************* Timeout Count . . . . . . . . :( 0) XRUN Count . . . . . . . . . : 0 Delay Count (>spare time) . . : 1 Delay Count (>1000 usecs) . . : 0 Delay Maximum . . . . . . . . : 6750 usecs Cycle Maximum . . . . . . . . : 717 usecs Average DSP Load. . . . . . . : 30.7 % Average CPU System Load . . . : 5.7 % Average CPU User Load . . . . : 23.2 % Average CPU Nice Load . . . . : 0.0 % Average CPU I/O Wait Load . . : 0.0 % Average CPU IRQ Load . . . . : 0.6 % Average CPU Soft-IRQ Load . . : 0.0 % Average Interrupt Rate . . . : 1683.8 /sec Average Context-Switch Rate . : 20015.8 /sec ********************************************* You'll see on http://ck.kolivas.org/patches/SCHED_ISO/iso2-benchmarks/jack_test3-iso2-40c-nolog.png That the 20s periodic thing delay has all but gone. Just one towards the end (no idea what that was). Cheers, Con - 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/