From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750788AbWGKNws (ORCPT ); Tue, 11 Jul 2006 09:52:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750794AbWGKNws (ORCPT ); Tue, 11 Jul 2006 09:52:48 -0400 Received: from ns.suse.de ([195.135.220.2]:23017 "EHLO mx1.suse.de") by vger.kernel.org with ESMTP id S1750788AbWGKNwr (ORCPT ); Tue, 11 Jul 2006 09:52:47 -0400 From: Andi Kleen To: Arjan van de Ven Subject: Re: [discuss] Re: [PATCH] Allow all Opteron processors to change pstate at same time Date: Tue, 11 Jul 2006 15:51:01 +0200 User-Agent: KMail/1.9.3 Cc: "Langsdorf, Mark" , "Deguara, Joachim" , discuss@x86-64.org, linux-kernel@vger.kernel.org, cpufreq@lists.linux.org.uk References: <84EA05E2CA77634C82730353CBE3A84303218EA4@SAUSEXMB1.amd.com> <1152624850.3128.45.camel@laptopd505.fenrus.org> In-Reply-To: <1152624850.3128.45.camel@laptopd505.fenrus.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200607111551.01444.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday 11 July 2006 15:34, Arjan van de Ven wrote: > > > Customers in the field seem to want to use TSC for gtod, > > so I want to know how awful an idea that is. > > in userspace or in the kernel? It has to be in kernel. User space is hopeless. > And do you happen to know why they don't want to use hpet? HPET is slow (although not as bad as PM) too and most BIOS don't enable it. -Andi