Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758901AbZGCUDf (ORCPT ); Fri, 3 Jul 2009 16:03:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757267AbZGCUDM (ORCPT ); Fri, 3 Jul 2009 16:03:12 -0400 Received: from casper.infradead.org ([85.118.1.10]:39150 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755878AbZGCUDK (ORCPT ); Fri, 3 Jul 2009 16:03:10 -0400 Date: Fri, 3 Jul 2009 13:04:21 -0700 From: Arjan van de Ven To: Andi Kleen Cc: Matthew Wilcox , Jens Axboe , Andi Kleen , linux-kernel@vger.kernel.org, "Styner, Douglas W" , Chinang Ma , "Prickett, Terry O" , Matthew Wilcox , Eric.Moore@lsi.com, DL-MPTFusionLinux@lsi.com Subject: Re: >10% performance degradation since 2.6.18 Message-ID: <20090703130421.646fe5cb@infradead.org> In-Reply-To: <20090703195458.GK2041@one.firstfloor.org> References: <20090703025607.GK5480@parisc-linux.org> <87skhdaaub.fsf@basil.nowhere.org> <20090703185414.GP23611@kernel.dk> <20090703191321.GO5480@parisc-linux.org> <20090703192235.GV23611@kernel.dk> <20090703194557.GQ5480@parisc-linux.org> <20090703195458.GK2041@one.firstfloor.org> Organization: Intel X-Mailer: Claws Mail 3.7.1 (GTK+ 2.14.7; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1003 Lines: 27 On Fri, 3 Jul 2009 21:54:58 +0200 Andi Kleen wrote: > > That would seem to be a fruitful avenue of > > investigation -- whether limiting the cards to a single RX/TX > > interrupt would be advantageous, or whether spreading the eight > > interrupts out over the CPUs would be advantageous. > > The kernel should really do the per cpu binding of MSIs by default. ... so that you can't do power management on a per socket basis? hardly a good idea. just need to use a new enough irqbalance and it will spread out the interrupts unless your load is low enough to go into low power mode. -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org -- 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/