Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030263AbWJCI4K (ORCPT ); Tue, 3 Oct 2006 04:56:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932551AbWJCI4K (ORCPT ); Tue, 3 Oct 2006 04:56:10 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:32164 "EHLO mx2.mail.elte.hu") by vger.kernel.org with ESMTP id S932549AbWJCI4I (ORCPT ); Tue, 3 Oct 2006 04:56:08 -0400 Date: Tue, 3 Oct 2006 10:47:29 +0200 From: Ingo Molnar To: Andrew Morton Cc: Thomas Gleixner , LKML , Jim Gettys , John Stultz , David Woodhouse , Arjan van de Ven , Dave Jones Subject: Re: [patch 00/21] high resolution timers / dynamic ticks - V2 Message-ID: <20061003084729.GA24961@elte.hu> References: <20061001225720.115967000@cruncher.tec.linutronix.de> <20061002210053.16e5d23c.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20061002210053.16e5d23c.akpm@osdl.org> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamScore: -2.8 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.8 required=5.9 tests=ALL_TRUSTED,AWL,BAYES_50 autolearn=no SpamAssassin version=3.0.3 -3.3 ALL_TRUSTED Did not pass through any untrusted hosts 0.5 BAYES_50 BODY: Bayesian spam probability is 40 to 60% [score: 0.5000] -0.0 AWL AWL: From: address is in the auto white-list X-ELTE-VirusStatus: clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1118 Lines: 33 * Andrew Morton wrote: > These patches make my Vaio run really really slowly. Maybe a quarter > of the normal speed or lower. Bisection shows that the bug is > introduced by > clockevents-drivers-for-i386.patch+clockevents-drivers-for-i386-fix.patch > > With all patches applied, the slowdown happens with > CONFIG_HIGH_RES_TIMERS=n and also with CONFIG_HIGH_RES_TIMERS=y && > CONFIG_NO_HZ=y. So something got collaterally damaged. yeah, i suspect it works again if you disable: CONFIG_X86_UP_APIC=y CONFIG_X86_UP_IOAPIC=y CONFIG_X86_LOCAL_APIC=y CONFIG_X86_IO_APIC=y as the slowdown has the feeling of a runaway lapic timer irq. from code review so far we can only see an udelay(10) difference in the initialization sequence of the PIT - we'll send a fix for that but i dont think that's the cause of the bug. investigating it. Ingo - 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/