From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965268AbXCHV5b (ORCPT ); Thu, 8 Mar 2007 16:57:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965259AbXCHV5b (ORCPT ); Thu, 8 Mar 2007 16:57:31 -0500 Received: from sj-iport-5.cisco.com ([171.68.10.87]:31822 "EHLO sj-iport-5.cisco.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965136AbXCHV52 (ORCPT ); Thu, 8 Mar 2007 16:57:28 -0500 X-IronPort-AV: i="4.14,264,1170662400"; d="scan'208"; a="398915208:sNHT339420444" To: "David Brown" Cc: "Linux Kernel Mailing List" Subject: Re: KVM and rtc missing interupts 2.6.21-rc3 X-Message-Flag: Warning: May contain useful information References: <9c21eeae0703081348i713c996bked9ebe2af76bc2db@mail.gmail.com> From: Roland Dreier Date: Thu, 08 Mar 2007 13:57:21 -0800 In-Reply-To: <9c21eeae0703081348i713c996bked9ebe2af76bc2db@mail.gmail.com> (David Brown's message of "Thu, 8 Mar 2007 13:48:43 -0800") Message-ID: User-Agent: Gnus/5.1007 (Gnus v5.10.7) XEmacs/21.4.19 (linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 08 Mar 2007 21:57:21.0439 (UTC) FILETIME=[BF51F2F0:01C761CC] Authentication-Results: sj-dkim-7; header.From=rdreier@cisco.com; dkim=pass ( sig from cisco.com/sjdkim7002 verified; ); Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > When ever I try and start a guest OS with kvm I get a lot of these rtc > missing interupt messages from the kernel > > [ 468.510878] rtc: lost some interrupts at 1024Hz. I started to debug this a little while ago but I never got too far. However it doesn't seem connected with kvm -- it is something to do with tun/tap or bridging holding a lock too long I think. Try running your guest with -no-kvm (and even with the kvm module not loaded, just to be sure). In my case I still saw the messages. However, removing the "-net tap" line from my command line did get rid of the messages. - R.