Re: port-xen/36530: High CPU temperature with XEN3_DOM0

[Christoph Egger <Christoph_Egger%gmx.de@localhost>]

The following reply was made to PR port-xen/36530; it has been noted by GNATS.

From: Christoph Egger <Christoph_Egger%gmx.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: port-xen/36530: High CPU temperature with XEN3_DOM0
Date: Tue, 03 Jun 2008 22:48:32 +0200

 Xen3 disables C1E resulting in more power consumption than in C1.
 This leads to the higher cpu temperature even when idling.
 
 In C1E state, the LAPIC is off and causes timer problems which in
 turn impact scheduling and the guest clock.
 That's why C1E is disabled.
 
 The "fix" would be to implement PowerNow support in NetBSD/Xen
 (Dom0 only feature). PowerNow support in Xen is partially
 available in Xen 3.2, better support will be in the coming Xen 3.3.
 
 Christoph