Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753906AbXLKRXz (ORCPT ); Tue, 11 Dec 2007 12:23:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752474AbXLKRXr (ORCPT ); Tue, 11 Dec 2007 12:23:47 -0500 Received: from ns.suse.de ([195.135.220.2]:36496 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752402AbXLKRXq (ORCPT ); Tue, 11 Dec 2007 12:23:46 -0500 To: mingo@elte.hu Cc: linux-kernel@vger.kernel.org Subject: Re: Performance overhead of get_cycles_sync 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> From: Andi Kleen Date: Tue, 11 Dec 2007 18:23:45 +0100 In-Reply-To: <20071211170334.GA30144@elte.hu> (Ingo Molnar's message of "Tue\, 11 Dec 2007 18\:03\:34 +0100") Message-ID: User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 556 Lines: 14 Ingo Molnar writes: > the TSC clocksource (and hence the vsyscall code) is turned off on > systems that fail the TOD/CLOCK portion of this test: 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. -Andi -- 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/