Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754065AbYH2H5J (ORCPT ); Fri, 29 Aug 2008 03:57:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752140AbYH2H4z (ORCPT ); Fri, 29 Aug 2008 03:56:55 -0400 Received: from mail.gmx.net ([213.165.64.20]:39334 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752116AbYH2H4z (ORCPT ); Fri, 29 Aug 2008 03:56:55 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1+4NSoic4m40S+ztKwfZVtGu6XmqdiysftAWjaqv9 cxTzzMKQhiJnI5 Subject: Re: [PATCH 6/6] sched: disabled rt-bandwidth by default From: Mike Galbraith To: Steven Rostedt Cc: Linus Torvalds , Mark Hounschell , Nick Piggin , Ingo Molnar , Peter Zijlstra , LKML , Stefani Seibold , Dario Faggioli , Max Krasnyansky , Thomas Gleixner , Andrew Morton In-Reply-To: References: <20080819103301.787700742@chello.nl> <200808290036.35817.nickpiggin@yahoo.com.au> <200808290134.35093.nickpiggin@yahoo.com.au> <48B6EB6F.2050802@compro.net> Content-Type: text/plain Date: Fri, 29 Aug 2008 09:56:47 +0200 Message-Id: <1219996607.5079.142.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.22.1.1 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-FuHaFi: 0.6 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1107 Lines: 26 On Thu, 2008-08-28 at 14:53 -0400, Steven Rostedt wrote: > On Thu, 28 Aug 2008, Linus Torvalds wrote: > > > > And I'm not really interested. Quite frankly, I suspect the "we want to > > run something like pulseaudio with RT priorities" camp is the more common > > one, and in that context I understand limiting SCHED_FIFO sounds perfectly > > understandable. > > The fact that it actually limits a SCHED_FIFO task group, over a single > task thread does bother me a little. It bothers me some too. You have to patch/re-compile the kernel if you need to turn it off and don't have SCHED_DEBUG enabled (not free). I tripped over this recently while regression testing. I didn't expect a gaggle of SCHED_RR tasks to be throttled on an otherwise idle box. Hitting that perturbed test results in an unexpected manner, and sent me off on a tangent. -Mike -- 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/