Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263459AbUJ3DXE (ORCPT ); Fri, 29 Oct 2004 23:23:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263460AbUJ3DXE (ORCPT ); Fri, 29 Oct 2004 23:23:04 -0400 Received: from rproxy.gmail.com ([64.233.170.205]:53493 "EHLO rproxy.gmail.com") by vger.kernel.org with ESMTP id S263459AbUJ3DW7 (ORCPT ); Fri, 29 Oct 2004 23:22:59 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:references; b=TtXDoTUl6i8Sx7YamXiMmq2akkCZ/ixWRvoheAYmPTRJze419Ip9F902/e18z1+cZAkVZxUGpMrP+Polsn+B9+Yq0H/KZpkMUSJ9aGWdQYzIjlyBJ46NwpZXmb3RrZOO4BWwXjo0FTavzR9Rqxn6ILBIxU1aqU85zqakn/gPpPw= Message-ID: Date: Fri, 29 Oct 2004 23:22:56 -0400 From: Joe Reply-To: Joe To: Lee Revell Subject: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4 Cc: Florian Schmidt , Rui Nuno Capela , Ingo Molnar , linux-kernel@vger.kernel.org, mark_h_johnson@raytheon.com, "K.R. Foley" , Bill Huey , Adam Heath , Thomas Gleixner , Michal Schmidt , Fernando Pablo Lopez-Lezcano , Karsten Wiese In-Reply-To: <1099105764.1504.4.camel@krustophenia.net> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit References: <5225.195.245.190.94.1098880980.squirrel@195.245.190.94> <33083.192.168.1.5.1098919913.squirrel@192.168.1.5> <20041028063630.GD9781@elte.hu> <20668.195.245.190.93.1098952275.squirrel@195.245.190.93> <20041028085656.GA21535@elte.hu> <26253.195.245.190.93.1098955051.squirrel@195.245.190.93> <20041028093215.GA27694@elte.hu> <43163.195.245.190.94.1098981230.squirrel@195.245.190.94> <20041029163135.1886d67f@mango.fruits.de> <1099105764.1504.4.camel@krustophenia.net> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1343 Lines: 27 On Fri, 29 Oct 2004 23:09:24 -0400, Lee Revell wrote: > On Fri, 2004-10-29 at 16:31 +0200, Florian Schmidt wrote: > > i tried a V0.5.2 with PREEMPT_REALTIME and all debugging off (config > > attached). I cannot reproduce your results. I have experienced around 30 > > xruns in 10 minutes. And big ones, too (> 5ms). I don't know exactly what > > kind of load triggers them. Here's a bit of qjackctl message window (btw: > > jackd was idle, no clients connected, except for qjackctl): > > > > I am seeing the same behavior, about 30 xruns in 10 minutes. It seems > to be triggered by display activity, among other things. This cannot be > a jackd issue, because with an earlier version (T3) I can run for 24 > hours without a single xrun. > > There has to be a bug somewhere in the RT preempt patch. > > Lee There is, this has been a well-known issue with many versions of real-time voluntary preemption, which is also a main reason as to why I avoid it, voluntary preemption performs flawlessly however RT has been horrendous. Hopefully the bugs will get smoothed out. - 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/