Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S968645AbWLETTL (ORCPT ); Tue, 5 Dec 2006 14:19:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S968648AbWLETTL (ORCPT ); Tue, 5 Dec 2006 14:19:11 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:49209 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S968645AbWLETTJ (ORCPT ); Tue, 5 Dec 2006 14:19:09 -0500 Subject: Re: irq/0/smp_affinity =3 doesn't seem to work From: Arjan van de Ven Reply-To: arjan@infradead.org To: "Raz Ben-Jehuda(caro)" Cc: Linux Kernel In-Reply-To: <5d96567b0612051114m21266529v779e34ffc492fc5e@mail.gmail.com> References: <5d96567b0612050830s1b0c0708s3f796d85227f1285@mail.gmail.com> <1165336346.3233.382.camel@laptopd505.fenrus.org> <5d96567b0612051114m21266529v779e34ffc492fc5e@mail.gmail.com> Content-Type: text/plain Organization: Intel International BV Date: Tue, 05 Dec 2006 20:19:07 +0100 Message-Id: <1165346347.3233.396.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.8.1.1 (2.8.1.1-3.fc6) Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1356 Lines: 37 On Tue, 2006-12-05 at 21:14 +0200, Raz Ben-Jehuda(caro) wrote: > On 12/5/06, Arjan van de Ven wrote: > > On Tue, 2006-12-05 at 18:30 +0200, Raz Ben-Jehuda(caro) wrote: > > > hello. > > > > > > I have a dual cpu AMD machine, I noticed that > > > only one timer0 is working in /proc/interrutps. > > > setting proc/irq/0/smp_affinity to 3 does make > > > any difference. > > > > if you set it to 3 then the chipset gets to decide where the irq goes. > > Many decide to send it to the first cpu. > > > > (not that it matters, the timer is so low frequency that it can go > > anywhere without problems) > > > > -- > > if you want to mail me at work (you don't), use arjan (at) linux.intel.com > > Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org > > > > > thanks Arjan. > > Yet something is not clear to me. > To the best of my knowledge , each cpu run its own schedule routine. > So, if only cpu0 gets timer0 interrupts, how does cpu1 > gets to run the schedule function > what interrupts cpu1' current task ? the scheduler code uses IPI's for that... - 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/