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RE: [Xen-users] cpu frequency scaling in domUs

from [Tian, Kevin]

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To:	"Vahid Kazempour" <kazempour@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-users] cpu frequency scaling in domUs
From:	"Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date:	Fri, 25 Jul 2008 13:06:14 +0800
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Thread-topic:	[Xen-users] cpu frequency scaling in domUs

If domU means PV domain in your mail, there's even no ACPI table exposed

to PV domain. HVM domain has one faked by Qemu. Also the value to expose

a virtual cpufreq feature is still unclear. Some papers discuss usage as

scheduler hint or help real power, but none gets into real product yet.

Thanks

Kevin

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Vahid Kazempour
Sent: 2008年7月25日 8:42
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] cpu frequency scaling in domUs

Hi,

I've recently installed xen-3.2.1 on my AMD Sempron(tm) machine.
It runs gentoo 2.6.21 as dom0 and cpu frequency scaling works in dom0.
But inside a domU, cpu frequency scaling is not working.
By checking the boot log in domU I found that domU is unable to load the powernow driver:
"powernow-k8: BIOS error - no PSB or ACPI _PSS objects"
I wonder if it is possible to have cpu frequency scaling support inside domUs?

--
Vahid

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