From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter P Waskiewicz Jr Subject: Re: [PATCH] irq: Add node_affinity CPU masks for smarter irqbalance hints Date: Tue, 24 Nov 2009 01:15:22 -0800 Message-ID: <1259054122.2631.31.camel@ppwaskie-mobl2> References: <20091123064630.7385.30498.stgit@ppwaskie-hc2.jf.intel.com> <2674af740911222332i65c0d066h79bf2c1ca1d5e4f0@mail.gmail.com> <1258968980.2697.9.camel@ppwaskie-mobl2> <1258995923.4531.715.camel@laptop> <1259051902.4531.1053.camel@laptop> <1259053156.2631.21.camel@ppwaskie-mobl2> <1259053736.4531.1097.camel@laptop> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: Yong Zhang , "linux-kernel@vger.kernel.org" , "arjan@linux.jf.intel.com" , "davem@davemloft.net" , "netdev@vger.kernel.org" , Thomas Gleixner To: Peter Zijlstra Return-path: Received: from mga09.intel.com ([134.134.136.24]:1044 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932388AbZKXJPN (ORCPT ); Tue, 24 Nov 2009 04:15:13 -0500 In-Reply-To: <1259053736.4531.1097.camel@laptop> Sender: netdev-owner@vger.kernel.org List-ID: On Tue, 2009-11-24 at 02:08 -0700, Peter Zijlstra wrote: > On Tue, 2009-11-24 at 00:59 -0800, Peter P Waskiewicz Jr wrote: > > > This all sounds backwards.. we've got a perfectly functional interface > > > for affinity -- which people object to being used for some reason. So > > > you add another interface on top, and that is ok? > > > > > > > But it's not functional. If I set the affinity in smp_affinity, then > > irqbalance will override it 10 seconds later. > > And here I was thinking the kernel round-robins IRQ delivery on the mask > specified there. Are you talking about some daft userspace thing that > writes into the irq smp_affinity to effect irq balancing? > Yep. That's exactly what irqbalance does. Cheers, -PJ