Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758503AbXLSPVW (ORCPT ); Wed, 19 Dec 2007 10:21:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755813AbXLSPVJ (ORCPT ); Wed, 19 Dec 2007 10:21:09 -0500 Received: from il.qumranet.com ([82.166.9.18]:42728 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754374AbXLSPVI (ORCPT ); Wed, 19 Dec 2007 10:21:08 -0500 Message-ID: <476936E2.9010902@qumranet.com> Date: Wed, 19 Dec 2007 17:21:06 +0200 From: Avi Kivity User-Agent: Thunderbird 2.0.0.9 (X11/20071115) MIME-Version: 1.0 To: Ingo Molnar CC: kvm-devel , linux-kernel Subject: Re: [kvm-devel] Guest kernel hangs in smp kvm for older kernels prior to tsc sync cleanup References: <47680173.6060606@qumranet.com> <20071218221930.GA26109@elte.hu> <4768BB43.1000609@qumranet.com> <4768FE27.7020305@qumranet.com> <47690304.1090903@qumranet.com> <20071219140624.GF21282@elte.hu> <47693054.20501@qumranet.com> <20071219150938.GA15267@elte.hu> In-Reply-To: <20071219150938.GA15267@elte.hu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 720 Lines: 23 Ingo Molnar wrote: > try this test perhaps in an SMP guest: > > http://people.redhat.com/mingo/time-warp-test/time-warp-test.c > > you can ignore TSC warps - but no GTOD or CLOCK warps should occur. > > On a broken guest kernel, I see gtod and clock warps. On a good guest kernel, I do not, presumably because the tsc clocksource is marked as unstable. I see tsc warps on both. 8 threads on 4 cpus. -- error compiling committee.c: too many arguments to function -- 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/