From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755342Ab1LMO6t (ORCPT ); Tue, 13 Dec 2011 09:58:49 -0500 Received: from mx1.redhat.com ([209.132.183.28]:14868 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752491Ab1LMO6s (ORCPT ); Tue, 13 Dec 2011 09:58:48 -0500 Message-ID: <4EE76810.7000802@redhat.com> Date: Tue, 13 Dec 2011 16:58:24 +0200 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111115 Thunderbird/8.0 MIME-Version: 1.0 To: Thomas Gleixner CC: Ingo Molnar , Pekka Enberg , LKML , Sasha Levin Subject: Re: [patch 0/3] kvm tool: Serial emulation overhaul References: <20111210132220.083204833@linutronix.de> <20111211103047.GA19299@elte.hu> <20111211155347.GA1297@elte.hu> <20111212172059.GC23870@elte.hu> <20111212192135.GA18876@elte.hu> <4EE72FCB.3070109@redhat.com> <4EE75FF8.5060208@redhat.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/13/2011 04:51 PM, Thomas Gleixner wrote: > > > The whole APIC timer calibration and the back and forth > > > conversion is definitely nothing which falls into the category of > > > smart. > > > > APIC timer calibration is silly but it hasn't proven to be a real-world > > problem. > > Well, that depends on the world. What I mean by that, is that I haven't seen any bug reports in this area apart from some issue with wiring the PIT/PIC/APIC correctly which were resolved long ago. > The issue with that calibration is > that it can be off and for a certain category of application it > matters. Definitely not for the usual virt workload stuff. But saving > cycles for highres/nohz enabled guests would be nice. Maybe I have a > go when I find a some time. Just dropping the calibration an replacing it with a pre-calibrated value should be simple, if there is a workload that could benefit. -- error compiling committee.c: too many arguments to function