From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@novell.com>
Subject: Re: Runaway real/sys time in newer paravirt domUs?
Date: Fri, 09 Jul 2010 17:00:13 +0100
Message-ID: <4C3763AD020000780000A8B1@vpn.id2.novell.com>
References: <B64CF51D-D1D4-494C-BEA8-F5C6F0A926B6@linode.com>
	<4C337E5D.7040407@goop.org>
	<053B0147-FC71-4440-896E-1A37E6A4CEEA@linode.com>
	<4C36FDED020000780000A6AA@vpn.id2.novell.com>
	<E2930D8D-5FD1-4C1C-AFEA-C9EB9192AD2C@linode.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <E2930D8D-5FD1-4C1C-AFEA-C9EB9192AD2C@linode.com>
Content-Disposition: inline
List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Jed Smith <jed@linode.com>
Cc: xen-devel@lists.xensource.com
List-Id: xen-devel@lists.xenproject.org

>>> On 09.07.10 at 16:57, Jed Smith <jed@linode.com> wrote:
> On Jul 9, 2010, at 4:46 AM, Jan Beulich wrote:
>> Is this perhaps also dependent on the CPU make/model?
>  - Between 2.6.29 and 2.6.30, /proc/uptime behaves much differently, and =
the=20
> bug
>    then exposes itself.  Something changed there.

Others as well as me had seen similar misbehavior (outside of pv-ops),
but only on reasonably new Intel systems. sched_clock_stable getting
set to one in arch/x86/kernel/cpu/intel.c turned out to be the problem.

Jan