Re: [PATCH] qemu-kvm: response to SIGUSR1 to start/stop a VCPU (v2)

Rik van Riel
2010-12-01T18:44:28Z

On 12/01/2010 12:22 PM, Peter Zijlstra wrote:
> On Wed, 2010-12-01 at 09:17 -0800, Chris Wright wrote:
>> Directed yield and fairness don't mix well either. You can end up
>> feeding the other tasks more time than you'll ever get back.
>
> If the directed yield is always to another task in your cgroup then
> inter-guest scheduling fairness should be maintained.
>
> Yes, but not the inter-vcpu fairness.

The pause loop exiting & directed yield patches I am working on
preserve inter-vcpu fairness by round robining among the vcpus
inside one KVM guest.

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