[dpdk-dev] [PATCH v4 00/10] VM Power Management

Thomas Monjalon thomas.monjalon at 6wind.com
Mon Oct 13 22:26:23 CEST 2014


Hi Alan,

2014-10-12 20:36, Alan Carew:
> The following patches add two DPDK sample applications and an alternate
> implementation of librte_power for use in virtualized environments.
> The idea is to provide librte_power functionality from within a VM to address
> the lack of MSRs to facilitate frequency changes from within a VM.
> It is ideally suited for Haswell which provides per core frequency scaling.
> 
> The current librte_power affects frequency changes via the acpi-cpufreq
> 'userspace' power governor, accessed via sysfs.

Something was preventing me from looking deeper in this big codebase,
but I didn't know what sounds weird.
Now I realize: the real problem is that virtualization transparency is
broken for power management. So the right thing to do is to fix it in
KVM. I think all this patchset is a huge workaround.

Did you try to fix it with Qemu/KVM?

-- 
Thomas


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