Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262465AbUJ0P3E (ORCPT ); Wed, 27 Oct 2004 11:29:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262458AbUJ0P3E (ORCPT ); Wed, 27 Oct 2004 11:29:04 -0400 Received: from smtp4.netcabo.pt ([212.113.174.31]:52650 "EHLO exch01smtp12.hdi.tvcabo") by vger.kernel.org with ESMTP id S262465AbUJ0P2o (ORCPT ); Wed, 27 Oct 2004 11:28:44 -0400 Message-ID: <12917.195.245.190.94.1098890763.squirrel@195.245.190.94> In-Reply-To: <20041027135309.GA8090@elte.hu> References: <20041019124605.GA28896@elte.hu> <20041019180059.GA23113@elte.hu> <20041020094508.GA29080@elte.hu> <20041021132717.GA29153@elte.hu> <20041022133551.GA6954@elte.hu> <20041022155048.GA16240@elte.hu> <20041022175633.GA1864@elte.hu> <20041025104023.GA1960@elte.hu> <20041027001542.GA29295@elte.hu> <5225.195.245.190.94.1098880980.squirrel@195.245.190.94> <20041027135309.GA8090@elte.hu> Date: Wed, 27 Oct 2004 16:26:03 +0100 (WEST) Subject: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4 From: "Rui Nuno Capela" To: "Ingo Molnar" Cc: linux-kernel@vger.kernel.org, "Lee Revell" , mark_h_johnson@raytheon.com, "K.R. Foley" , "Bill Huey" , "Adam Heath" , "Florian Schmidt" , "Thomas Gleixner" , "Michal Schmidt" , "Fernando Pablo Lopez-Lezcano" , "Karsten Wiese" User-Agent: SquirrelMail/1.4.3a X-Mailer: SquirrelMail/1.4.3a MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT X-Priority: 3 (Normal) Importance: Normal X-OriginalArrivalTime: 27 Oct 2004 15:28:38.0463 (UTC) FILETIME=[A1A9BCF0:01C4BC39] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1226 Lines: 38 Ingo Molnar wrote: > > Rui Nuno Capela wrote: > >> OK. Currently with RT-V0.3.2. >> >> So it seems that the jackd -R is no more an issue here. > > great. > >> However (oh no!:) those jackd -R xruns are still frequent, much >> frequent than RT-U3, which is my stable RT kernel atm. > > -V0.4.1 could help with this problem. There were a number of places > where the PREEMPT_REALTIME kernel missed reschedules so it could easily > happen that jackd would sit in the runqueue waiting to be executed and > the kernel got quickly out of a critical section but then the kernel > 'forgot' to reschedule for many milliseconds! > On RT-V0.4.1, xruns seems slighly reduced, but plenty enough for my taste. Running jackd -R with 6 fluidsynth instances gives me 0 (zero) xruns on RT-U3, but more than 20 (twenty) on RT-V0.4.1, under a 5 minute time frame. It was 30 (thirty something) on RT-V0.4, but overall "feel" is about the same. Cheers. -- rncbc aka Rui Nuno Capela rncbc@rncbc.org - 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/