From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@novell.com>
Subject: Re: Xen 4 TSC problems
Date: Thu, 24 Feb 2011 12:37:53 +0000
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To: Olivier Hanesse <olivier.hanesse@gmail.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>, xen-devel@lists.xensource.com, Keir Fraser <keir@xen.org>, Dan Magenheimer <dan.magenheimer@oracle.com>, Xen Users <xen-users@lists.xensource.com>, Mark Adams <mark@campbell-lange.net>
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>>> On 24.02.11 at 12:57, Olivier Hanesse <olivier.hanesse@gmail.com> =
wrote:
> I tried to turn off cstates with max_cstate=3D0 without success (still =
"not
> reliable").
>=20
> With cpuidle=3D0, I also got :
>=20
> (XEN) TSC has constant rate, deep Cstates possible, so not reliable,
> warp=3D3022 (count=3D1)

This message by itself isn't telling much I believe.

> xm info | grep command
> xen_commandline        : dom0_mem=3D512M cpuidle=3D0 loglvl=3Dall =
guest_loglvl=3Dall
> dom0_max_vcpus=3D1 dom0_vcpus_pin console=3Dvga,com1 com1=3D19200,8n1
>=20
> Keir :
>=20
> Using clocksource=3Dpit :
>=20
> (XEN) Platform timer is 1.193MHz PIT
>=20
> I also got :
>=20
> (XEN) TSC has constant rate, deep Cstates possible, so not reliable,
> warp=3D3262 (count=3D2)

The question is whether any of this eliminates the time jumps seen
by your DomU-s (from your past mails I wasn't actually sure whether
Dom0 also experienced this problem, albeit it would be odd if it didn't).

Jan

Jan