Re: [Xen-devel] [PATCH v1 1/4] xen: add real time scheduler rt

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Wed, Sep 3, 2014 at 4:46 PM, Dario Faggioli
<dario.faggioli@xxxxxxxxxx> wrote:
>> 3) We only create arrays that have the vcpus to be modified. After we
>> bound the array to hypervisor, hypervisor can use the vcpu's index to
>> decide which vcpu's parameters should be modified.
>>
> This is an option. I like it less than 1), but I can see that, with 1),
> changing the parameters of 1 vcpu of a 32 vcpus domain means pushing
> down to Xen quite a bit of 0-s,. :-O

I guess the real question is how often we expect to be updating the
parameters of a single vcpu, vs just setting all of the parameters
(e.g., during domain creation).

If we expect a lot of tweaking from user-space tools, then we should
go with 3.  If we expect people to set parameters and then leave them
alone, we should go with 1.

 -George

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