Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752886AbZGYXBK (ORCPT ); Sat, 25 Jul 2009 19:01:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752617AbZGYXBK (ORCPT ); Sat, 25 Jul 2009 19:01:10 -0400 Received: from mail2.shareable.org ([80.68.89.115]:43731 "EHLO mail2.shareable.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752326AbZGYXBJ (ORCPT ); Sat, 25 Jul 2009 19:01:09 -0400 Date: Sun, 26 Jul 2009 00:01:00 +0100 From: Jamie Lokier To: sen wang Cc: Raistlin , Peter Zijlstra , mingo@elte.hu, akpm@linux-foundation.org, kernel@kolivas.org, npiggin@suse.de, arjan@infradead.org, linux-arm-kernel@lists.arm.linux.org.uk, linux-kernel@vger.kernel.org Subject: Re: report a bug about sched_rt Message-ID: <20090725230100.GC15260@shareable.org> References: <454c71700907240357l61f5c4fajaca73db0fba7db8@mail.gmail.com> <1248437670.6987.26.camel@twins> <454c71700907240604h4673f117j8ed58b9f2ee54798@mail.gmail.com> <1248441290.6987.52.camel@twins> <454c71700907240626w127fd890ufa91ef90cbcaaa@mail.gmail.com> <1248520224.8429.83.camel@Palantir> <454c71700907250429i1c77658bt6d65b02f08a29f4a@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <454c71700907250429i1c77658bt6d65b02f08a29f4a@mail.gmail.com> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 982 Lines: 25 sen wang wrote: > but, to the realtime system like a decoder, I think we should meet the rt > task as we can. If the realtime task is something like a video decoder feeding a display, and it is bandwidth-throttled only to ensure things like SSH and filesystem I/O are still available, then I have to agree with Sen, you would want any "spare" CPU to go the video decoder in that application, not the idle task. > the RT scheduler is mainly used for realtime system which should have the > different policy from fair task. The RT scheduler is used for lots of different systems which you haven't considered. For your application, probably the way RT-bandwidth works is not useful. It's better for some other applications. -- Jamie -- 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/