Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261649AbVEJNkX (ORCPT ); Tue, 10 May 2005 09:40:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261642AbVEJNkW (ORCPT ); Tue, 10 May 2005 09:40:22 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:27029 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S261650AbVEJNkG (ORCPT ); Tue, 10 May 2005 09:40:06 -0400 Subject: Re: [suse-amd64] False "lost ticks" on dual-Opteron system (=> timer twice as fast) From: Arjan van de Ven To: Andi Kleen Cc: Bernd Paysan , suse-amd64@suse.com, linux-kernel@vger.kernel.org In-Reply-To: <20050510132153.GJ25612@wotan.suse.de> References: <200505081445.26663.bernd.paysan@gmx.de> <200505101355.00341.bernd.paysan@gmx.de> <20050510130709.GI25612@wotan.suse.de> <200505101515.56177.bernd.paysan@gmx.de> <20050510132153.GJ25612@wotan.suse.de> Content-Type: text/plain Date: Tue, 10 May 2005 15:39:49 +0200 Message-Id: <1115732389.6008.28.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 (2.0.4-4) Content-Transfer-Encoding: 7bit X-Spam-Score: 3.7 (+++) X-Spam-Report: SpamAssassin version 2.63 on pentafluge.infradead.org summary: Content analysis details: (3.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 1.1 RCVD_IN_DSBL RBL: Received via a relay in list.dsbl.org [] 2.5 RCVD_IN_DYNABLOCK RBL: Sent directly from dynamic IP address [80.57.133.107 listed in dnsbl.sorbs.net] 0.1 RCVD_IN_SORBS RBL: SORBS: sender is listed in SORBS [80.57.133.107 listed in dnsbl.sorbs.net] 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: 911 Lines: 22 On Tue, 2005-05-10 at 15:21 +0200, Andi Kleen wrote: > On Tue, May 10, 2005 at 03:15:44PM +0200, Bernd Paysan wrote: > > On Tuesday 10 May 2005 15:07, Andi Kleen wrote: > > > That could be irqbalance doing its thing. Does it go away when > > > you stop it? > > > > Yes, it seems to go away. > > Ok, it is fine then. A bit unexpected, but fine. irqbalance nowadays rotates the timer interrupt every 10 seconds after some people complained that having it always on the same cpu penalized their HPC apps unbalanced. (they glued those tasks to each cpu). It's not a big deal (the irq rate isn't that high) and it does make things slightly more fair in the HPC case. - 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/