Re: [Xen-devel] Auto CPU rebalance ?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 29 Dec 2005, at 22:05, Ian Pratt wrote:

> It remains to be seen whether gang scheduling is actually necessary. 
> I'd
> like to see how well some combination of "bad pre-emption"
> avoidance/mitigation coupled with biasing the scheduler to run vcpu's 
> of
> domains that already have vcpu's running.
>
> Strict gang scheduling is likely to lead to a lot of wasted cycles, and
> I expect we can do better. The first step is to define a set of
> workloads we want to optimise for, and collect some traces.
We need a gang-scheduling option for hyperthreads. Unless they are 
devoted to service domains, it doesn't make sense to run different 
domUs simultaneously on the same core.
 -- Keir


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