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RE: [Xen-devel] A clocksource question

To: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Joanna Rutkowska <joanna@xxxxxxxxxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>
From: Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>
Date: Thu, 11 Mar 2010 00:21:43 +0000
Accept-language: en-US
Acceptlanguage: en-US
Cc: Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Wed, 10 Mar 2010 16:23:08 -0800
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
Thread-index: AcrAr1/PtyJDZnWPSQqz+S9VdVwEJwAATlqA
Thread-topic: [Xen-devel] A clocksource question

> The TSC delta is troubling... if you hadn't said you had turned
> off all power management, I would have guessed a problem with
> C-state management.  Maybe Xen is discovering some power management
> capability not visible in BIOS settings?

Xen uses the architectural C state mechanism, bypassing ACPI.
Use "max_cstate=0"

Ian

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