Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261647AbVAXVD1 (ORCPT ); Mon, 24 Jan 2005 16:03:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261595AbVAXVCD (ORCPT ); Mon, 24 Jan 2005 16:02:03 -0500 Received: from mx1.elte.hu ([157.181.1.137]:40911 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S261651AbVAXUzv (ORCPT ); Mon, 24 Jan 2005 15:55:51 -0500 Date: Mon, 24 Jan 2005 21:55:09 +0100 From: Ingo Molnar To: "Jack O'Quin" Cc: Con Kolivas , Paul Davis , linux , rlrevell@joe-job.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 Message-ID: <20050124205509.GB20485@elte.hu> References: <200501201542.j0KFgOwo019109@localhost.localdomain> <87y8eo9hed.fsf@sulphur.joq.us> <20050120172506.GA20295@elte.hu> <877jm3qqxz.fsf@sulphur.joq.us> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <877jm3qqxz.fsf@sulphur.joq.us> User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1040 Lines: 24 * Jack O'Quin wrote: > Has anyone done this kind of realtime testing on an SMP system? I'd > love to know how they compare. Unfortunately, I don't have access to > one at the moment. Are they generally better or worse for this kind > of work? I'm not asking about partitioning or processor affinity, but > actually using the entire SMP complex as a realtime machine. this particular test was done with an UP kernel. (although the testsystem indeed is an SMP box.) Generally i mention SMP explicitly. There are a couple of patches in the -RT tree to make RT scheduling better on SMP systems. with those fixes applied (i.e. under the -RT kernel), jackd/jack_test behaves better than on a single CPU. I didnt find any scheduling anomaly that wasnt caused by the kernel. Ingo - 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/