>Number:         36530
>Category:       port-xen
>Synopsis:       High CPU temperature with XEN3_DOM0
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    port-xen-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jun 23 17:50:00 +0000 2007
>Originator:     fukumoto@imasy.or.jp
>Release:        NetBSD 4.0_BETA2
>Organization:
>Environment:
System: NetBSD kestrel 4.0_BETA2 NetBSD 4.0_BETA2 (GENERIC.MP) #4: Sat Mar 31 04:34:08 JST 2007 fukumoto@kestrel:/usr/src.netbsd4/sys/arch/i386/compile/GENERIC.MP i386
Architecture: i386
Machine: i386
>Description:

CPU temperature is high with XEN3_DOM0 kernel even when 100% idle state.
No DOMU is running.
This has been same for xen 3.0.3, 3.0.4, 3.1.0 with netbsd-4 XEN3_DOM0.
Xen 2 + XEN2_DOM0 does not have this symptom.
Hardware is AMD Athlon 64 X2 on ASUS M2NPV-VM motherboard.
Temperature is measured using a modified it(4) (see pr/35796 for the detail of modification).

On Xen 3.1 + XEN3_DOM0, idle state:
   CPU Temp:     46.000 degC

For comparison, idle GENERIC.MP kernel:
   CPU Temp:     34.000 degC

GENERIC.MP kernel with 100% load (md5 /dev/zero)
   CPU Temp:     39.000 degC

GENERIC.MP kernel with 200% load (md5 /dev/zero & md5 /dev/zero &)
   CPU Temp:     53.000 degC
>How-To-Repeat:
set up xen3 and XEN3_DOM0, boot and measure CPU temperature
>Fix:

>Unformatted: