Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754492Ab2EUPeg (ORCPT ); Mon, 21 May 2012 11:34:36 -0400 Received: from mail-bk0-f46.google.com ([209.85.214.46]:48068 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753525Ab2EUPed (ORCPT ); Mon, 21 May 2012 11:34:33 -0400 Date: Mon, 21 May 2012 19:34:28 +0400 From: Cyrill Gorcunov To: Ingo Molnar Cc: Alexander Gordeev , Arjan van de Ven , linux-kernel@vger.kernel.org, x86@kernel.org, Suresh Siddha , Yinghai Lu , Linus Torvalds Subject: Re: [PATCH 2/3] x86: x2apic/cluster: Make use of lowest priority delivery mode Message-ID: <20120521153428.GG7767@moon> References: <20120518102640.GB31517@dhcp-26-207.brq.redhat.com> <20120521082240.GA31407@gmail.com> <20120521093648.GC28930@dhcp-26-207.brq.redhat.com> <20120521124025.GC17065@gmail.com> <20120521144812.GD28930@dhcp-26-207.brq.redhat.com> <20120521145904.GA7068@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120521145904.GA7068@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 651 Lines: 18 On Mon, May 21, 2012 at 04:59:04PM +0200, Ingo Molnar wrote: > > When a device is generating ten thousand irqs a second then > round-robining the IRQs is equivalent to switching a CPU every > 100 usecs. > As far as I remember it's even more complex, with lowprio it might be not complete fair round-robin, since if focused processor found then it'll be assigned to handle incoming irq again. Cyrill -- 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/