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RE: [Xen-users] cpu frequency scaling in domUs
- To: "Vahid Kazempour" <kazempour@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
- From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
- Date: Fri, 25 Jul 2008 13:06:14 +0800
- Cc:
- Delivery-date: Thu, 24 Jul 2008 22:06:57 -0700
- List-id: Xen user discussion <xen-users.lists.xensource.com>
- Thread-index: Acjt73lFz8rQZfXOQteM/A8ixzoGFgAJAK7g
- 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
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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