[libvirt] [PATCH 0/3] qemu: support -overcommit cpu-pm=on|off

[Menno Lageman]

On 26-03-2020 17:04, Daniel P. Berrangé wrote:
> On Mon, Aug 19, 2019 at 10:32:23AM +0200, Menno Lageman wrote:
>> QEMU introduced a CPU power management feature with commit 6f131f13e68d
>> ("kvm: support -overcommit cpu-pm=on|off").
>>
>> With this flag, kvm allows guest to control host CPU power state.  This
>> increases latency for other processes using same host CPU in an
>> unpredictable way, but if decreases idle entry/exit times for the
>> running VCPU, so to use it QEMU needs a hint about whether host CPU is
>> overcommitted, hence the flag name.
>>
>> This patch series adds a new kvm feature 'cpu-pm' for controlling
>> "-overcommit cpu-pm=[on|off]"
>>
>>      <features>
>>        <kvm>
>>          <cpu-pm state='on'/>
>>        </kvm>
>>      </features>
> 
> Unless I'm missing it, there was never a followup v2 for this
> series ?  Did you ever do more work on this, as this is still
> a useful feature to support for KVM to maximize performance
> AFAIK.
> 

It's on my TODO list but other things got ahead in the queue.

Menno