2015-03-25 7:58 GMT-04:00 George Dunlap <[email protected]>:
> On 03/25/2015 01:48 AM, Meng Xu wrote: > > Exactly! 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? > I guess you mean: certain schedulers to automatically switch to "no accounting" mode when the hard_affinity of a vcpu is limited to one " cpu " (not vcpu) , and no other vcpus are also limited to that one " cpu " ? Am I correct? :-) If so, I think yes, it should be better than having a new hypercall because in this case, user does want to isolate a dedicated cpu to a dedicated vcpu. Best regards, Meng ----------- Meng Xu PhD Student in Computer and Information Science University of Pennsylvania
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