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Re: About NetBSD and Xen (Was: Stability of -current for a Xen Dom0 machine)
> Power management under Xen requires ACPI support, as the hypervisor does not
> implement extensive power management routines. Today's machines requires ACPI
> parsing to query/obtain information regarding almost everything, including
> PM, and this task is devoted to dom0. The support is missing for NetBSD.
Yes, that's why I was looking with interest at acpicpu(4) and was hoping it
could be working on a XEN3_DOM0 kernel. AFAICT it seemed to do a very good job
on non-XEN kernels.
> There are some quirks for playing with CPUs , but IMHO, it does not
> qualify as power "management" :o
>  http://mail-index.netbsd.org/port-xen/2010/05/22/msg006014.html
Thank you for the link. It was one of the first results that came up on google
while searching for information about this thing. cpufreq=dom0-kernel gives the
cpufreq control to Dom0. But my dom0 doesn't see any way of throttling the
cpu/states, so nothing changes. My cpu is not recognised by the "powernow-k8",
and the only way to have some power reduction is acpicpu.
Reading about your (committed) patch , I hoped I could be able to launch a
Dom0 kernel with acpicpu support and Xen with cpufreq=dom0-kernel but it seems
the acpicpu support is not still available on dom0 kernel. So it seems it's a
no-go, for now.
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