From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marcelo Tosatti <mtosatti@redhat.com>
Subject: Re: Soft lockups and cpu frequency scaling
Date: Wed, 6 Jan 2010 07:33:08 -0200
Message-ID: <20100106093308.GA5363@amt.cnet>
References: <4B30C6C1.9080508@scsy.de> <20091224155210.GB13003@amt.cnet> <4B41F4B9.4090005@scsy.de> <20100106083529.GA3680@amt.cnet> <4B444686.1060309@scsy.de>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: kvm@vger.kernel.org
To: Martin Schmitt <mas@scsy.de>
Return-path: <kvm-owner@vger.kernel.org>
Received: from mx1.redhat.com ([209.132.183.28]:28418 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1755530Ab0AFJe2 (ORCPT <rfc822;kvm@vger.kernel.org>);
	Wed, 6 Jan 2010 04:34:28 -0500
Content-Disposition: inline
In-Reply-To: <4B444686.1060309@scsy.de>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

On Wed, Jan 06, 2010 at 09:15:02AM +0100, Martin Schmitt wrote:
> Marcelo Tosatti schrieb:
> 
> > Can you please share a few more "soft lockup" messages? (with
> > backtrace included).
> 
> Full dmesg from guest: http://pastebin.com/f51a966df
> 
> > Also qemu command line.
> 
> >From ps:
> 
> /usr/local/kvm/bin/qemu-system-x86_64 -hda /drbd/vweb/vweb.vmdk -vnc
> 127.0.0.1:4 -m 512 -net nic,macaddr=00:16:3e:6a:a5:10 -net tap
> -enable-kvm -k de -pidfile /drbd/vweb/pidfile.pid -monitor
> tcp:127.0.0.1:1004,server,nowait -name /drbd/vweb/vweb.vmdk -cpu host
> -daemonize

Hum, can you try converting that vmdk image to qcow2 or raw? (with
qemu-img convert).

AFAICS the QEMU vmdk implementation is synchronous, so the guest 
waits on IO operations to complete on the host side.

> > And boot-up messages of host and guest.
> 
> Does the dmesg above cover that for the guest or are you asking for
> anything further than that?
> 
> Host side dmesg: http://pastebin.com/f47a30d22
> 
> Thanks for your time,
> 
> -martin