From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752048AbYIUM1S (ORCPT ); Sun, 21 Sep 2008 08:27:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751406AbYIUM1G (ORCPT ); Sun, 21 Sep 2008 08:27:06 -0400 Received: from tac.ki.iif.hu ([193.6.222.43]:58395 "EHLO tac.ki.iif.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751385AbYIUM1F (ORCPT ); Sun, 21 Sep 2008 08:27:05 -0400 From: Ferenc Wagner To: Jeremy Fitzhardinge Cc: linux-kernel@vger.kernel.org, Xen-devel Subject: Re: doubled idle count References: <87vdwtfxng.fsf@tac.ki.iif.hu> <48D2AD5E.7040602@goop.org> Date: Sun, 21 Sep 2008 14:27:00 +0200 In-Reply-To: Ferenc Wagner's message of "Fri, 19 Sep 2008 18:53:35 +0200" Message-ID: <871vzdfzvv.fsf@tac.ki.iif.hu> User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (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 Ferenc Wagner writes: > Jeremy Fitzhardinge writes: > --text follows this line-- >> Ferenc Wagner wrote: >> >>> After upgrading a Xen virtual machine to Debian's 2.6.26-4 kernel, I >>> noticed that the idle counter doubled its pace on one of the machines: >>> [...] >>> One out of three machines show this effect, with the exact same kernel >>> and Xen versions (3.2.0, dom0 is Debian's stock Etch 2.6.18 kernel). >>> They aren't hosted by the same machine, though: the misbehaving one is >>> on a different installation with very similar hardware (3 vs 2 GHz). >>> All the guest are paravirtual. >> >> So you're saying that they are identical Xen and guest kernel binaries, >> but one of three is showing doubled idle time? > > Now I upgraded another domU, and that also shows this doubling effect, > so I've got two domUs (running on xen2-ha) misbehaving, and other two > (running on xen2) behaving correctly. Also, top is not confused, it shows <100% idle times. Maybe it's allright, or maybe top simply subtracts all the rest from 100... -- Feri.