From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759252AbZGCXfS (ORCPT ); Fri, 3 Jul 2009 19:35:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754794AbZGCXfG (ORCPT ); Fri, 3 Jul 2009 19:35:06 -0400 Received: from one.firstfloor.org ([213.235.205.2]:59894 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752794AbZGCXfF (ORCPT ); Fri, 3 Jul 2009 19:35:05 -0400 Date: Sat, 4 Jul 2009 01:35:05 +0200 From: Andi Kleen To: Arjan van de Ven Cc: Andi Kleen , Matthew Wilcox , Jens Axboe , 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: <20090703233505.GL2041@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> <20090703130421.646fe5cb@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090703130421.646fe5cb@infradead.org> User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > ... so that you can't do power management on a per socket basis? > hardly a good idea. Interrupts should only happen when the socket did spent time submitting the work for them. Typically on drivers I'm familiar with the return MSI is tied to the CPU that did submit the work item > 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. When that load is low then likely you won't get many interrupts anyways. -Andi -- ak@linux.intel.com -- Speaking for myself only.