Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756740AbYJIHP0 (ORCPT ); Thu, 9 Oct 2008 03:15:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755487AbYJIHPO (ORCPT ); Thu, 9 Oct 2008 03:15:14 -0400 Received: from www.tglx.de ([62.245.132.106]:54297 "EHLO www.tglx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751272AbYJIHPN (ORCPT ); Thu, 9 Oct 2008 03:15:13 -0400 Date: Thu, 9 Oct 2008 09:14:34 +0200 (CEST) From: Thomas Gleixner To: Jeff Hansen cc: Chris Snook , torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, mingo@elte.hu Subject: Re: [PATCH] Re: x86_32 tsc/pit and hrtimers In-Reply-To: Message-ID: References: <48ECFEDC.90305@redhat.com> <48ED1728.5060708@redhat.com> <48ED2A89.3000902@redhat.com> User-Agent: Alpine 2.00 (LFD 1167 2008-08-23) 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: 924 Lines: 26 On Wed, 8 Oct 2008, Jeff Hansen wrote: > [HRTIMER]: Add highres=noverify option to bypass clocksource verification > > This disregards the CLOCK_SOURCE_MUST_VERIFY flag on all clocksources. > This is particularly useful on legacy x86_32 systems that have no ACPI, > LAPIC, or HPET timers, where only TSC and PIT are available. While I agree in principle, adding this to highres is the wrong thing to do. This is a property of clocksources and not of high resolution timer support. The affected clocksource is TSC and it should go there as a command line option e.g. tsc=stable, which in turn clears the CLOCK_SOURCE_MUST_VERIFY flag in the tsc clocksource. Thanks, 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/