Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758807AbYLLOWf (ORCPT ); Fri, 12 Dec 2008 09:22:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758170AbYLLOW0 (ORCPT ); Fri, 12 Dec 2008 09:22:26 -0500 Received: from bombadil.infradead.org ([18.85.46.34]:39809 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758201AbYLLOWZ (ORCPT ); Fri, 12 Dec 2008 09:22:25 -0500 Subject: Re: CFS scheduler OLTP perforamnce From: Peter Zijlstra To: Andi Kleen Cc: "Ma, Chinang" , Ingo Molnar , "linux-kernel@vger.kernel.org" , "Wilcox, Matthew R" , "Van De Ven, Arjan" , "Styner, Douglas W" , "Chilukuri, Harita" , "Wang, Peter Xihong" , "Nueckel, Hubert" In-Reply-To: <87wse5bhu4.fsf@basil.nowhere.org> References: <1229083933.12883.179.camel@twins> <87wse5bhu4.fsf@basil.nowhere.org> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Fri, 12 Dec 2008 15:22:15 +0100 Message-Id: <1229091735.25485.8.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.24.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 767 Lines: 20 On Fri, 2008-12-12 at 15:15 +0100, Andi Kleen wrote: > Peter Zijlstra writes: > >> > >> It seems that in this case renice to higher priority with CFS did not > >> reduce scheduling latency as well as SCHED_RR. > > > > Is there a question in this email? > > The question is how to make nice perform as well as SCHED_RR. Depending on the circumstances, you can't - SCHED_RR doesn't bother with fairness. That is not to say there is no room for improvement, but that really needs more information. -- 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/