WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

RE: [Xen-devel] A clocksource question

To: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Joanna Rutkowska <joanna@xxxxxxxxxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: RE: [Xen-devel] A clocksource question
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
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <56cc3abf-21f6-4178-b00e-0331538080d9@default>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <4B962748.90609@xxxxxxxxxxxxxxxxxxxxxx> <4B96DB69.10101@xxxxxxxx 4B981997.4030605@xxxxxxxxxxxxxxxxxxxxxx> <56cc3abf-21f6-4178-b00e-0331538080d9@default>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
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

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel