Re: [Xen-devel] Design and Question: Eliminate Xen (RTDS) scheduler overhead on dedicated CPU

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 03/25/2015 01:50 PM, Meng Xu wrote:
> 2015-03-25 7:58 GMT-04:00 George Dunlap <george.dunlap@xxxxxxxxxxxxx>:
> 
>> On 03/25/2015 01:48 AM, Meng Xu wrote:
>>> âExactly! I will do some measurement on the overhead in #2 before I
>> really
>>> try to do it. Since #1 is fairly easy, I will first implement #1 and see
>>> how much gap it remains to achieve the bare-metal performance.
>>
>> Interface-wise: I'm wondering if at the Xen or libxl level we really
>> need to have a whole new set of hypercalls, at least to implement #1.
>> Would it make sense for certain schedulers to automatically switch to
>> "no accounting" mode when the hard_affinity of a vcpu is limited to one
>> vcpu, and no other vcpus are also limited to that one vcpu?
>>
> 
> âI guess you mean:â
> certain schedulers to automatically switch to
> "no accounting" mode when the hard_affinity of a vcpu is limited to one
> â"â
> cpu
> â" (not vcpu)â
> , and
> ââ
> no other vcpus are also limited to that one
> â"â
> cpu
> â"â
> ?
> 
> âAm I correct? :-)â

Ah, yes, thanks. :-)

 -George


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