Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756113AbXLKUag (ORCPT ); Tue, 11 Dec 2007 15:30:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751983AbXLKUa2 (ORCPT ); Tue, 11 Dec 2007 15:30:28 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:37211 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751410AbXLKUa1 (ORCPT ); Tue, 11 Dec 2007 15:30:27 -0500 Date: Tue, 11 Dec 2007 21:29:54 +0100 From: Ingo Molnar To: Andi Kleen Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , Arjan van de Ven , dor.laor@qumranet.com, kvm-devel Subject: Re: Performance overhead of get_cycles_sync Message-ID: <20071211202954.GA27929@elte.hu> References: <475E8C8B.7070308@qumranet.com> <20071211133738.GA8150@elte.hu> <475E9A92.4030001@qumranet.com> <20071211142717.GA15903@elte.hu> <20071211083513.56c2a385@laptopd505.fenrus.org> <20071211170334.GA30144@elte.hu> <20071211201930.GB22397@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071211201930.GB22397@elte.hu> User-Agent: Mutt/1.5.17 (2007-11-01) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 635 Lines: 20 * Ingo Molnar wrote: > > Which is not on core2 which was the question about. And if it was > > turned off it wouldn't use get_cycles_sync() at all. > > it is turned off on core2 too: > > # cat /sys/devices/system/clocksource/clocksource0/current_clocksource > acpi_pm but you are right that it's not turned off on all core2's, so my patch is wrong for them. 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/