Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760012AbXFJObU (ORCPT ); Sun, 10 Jun 2007 10:31:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754612AbXFJObI (ORCPT ); Sun, 10 Jun 2007 10:31:08 -0400 Received: from www.osadl.org ([213.239.205.134]:60096 "EHLO mail.tglx.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752293AbXFJObH (ORCPT ); Sun, 10 Jun 2007 10:31:07 -0400 Subject: Re: [patch-mm 07/23] Tick management: spread timer interrupt From: Thomas Gleixner To: Andreas Mohr Cc: LKML , Andrew Morton , Ingo Molnar , Andi Kleen , Arjan van de Ven , Venkatesh Pallipadi , Chris Wright , john stultz In-Reply-To: <20070610141617.GA15173@rhlx01.hs-esslingen.de> References: <20070610092437.118387863@inhelltoy.tec.linutronix.de> <20070610092446.625214085@inhelltoy.tec.linutronix.de> <20070610141617.GA15173@rhlx01.hs-esslingen.de> Content-Type: text/plain Date: Sun, 10 Jun 2007 16:31:03 +0200 Message-Id: <1181485863.384.15.camel@chaos> Mime-Version: 1.0 X-Mailer: Evolution 2.10.1 (2.10.1-4.fc7) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 764 Lines: 22 On Sun, 2007-06-10 at 16:16 +0200, Andreas Mohr wrote: > Hi, > > On Sun, Jun 10, 2007 at 09:44:05AM -0000, Thomas Gleixner wrote: > > From: john stultz > > > > After discussing w/ Thomas over IRC, it seems the issue is the sched > > tick fires on every cpu at the same time, causing extra lock contention. > > Hmm, the cpu-specific offset calculation isn't too expensive, hopefully? > (div/mul in patch, maybe this could be done differently) That's one time during setup, no hot path. tglx - 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/