[Devel] Re: [RFC] CPU hard limits

[Avi Kivity]

Balbir Singh wrote:
>> I think so.  Given guarantees G1..Gn (0 <= Gi <= 1; sum(Gi) <= 1), and a  
>> cpu hog running in each group, how would the algorithm divide resources?
>>
>>     
>
> As per the matrix calculation, but as soon as we reach an idle point,
> we redistribute the b/w and start a new quantum so to speak, where all
> groups are charged up to their hard limits.
>
> For your question, if there is a CPU hog running, it would be as per
> the matrix calculation, since the system has no idle point during the
> bandwidth period.
>   

So the groups with guarantees get a priority boost.  That's not a good 
side effect.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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