Re: [Xen-devel] Real-time support

["Geoffrey Lefebvre" <geoffrey@xxxxxxxxx>]

Hi,

I did some basic measurements on worst case execution time inside the
hypervisor a while ago (6-8 months ago).  From what i remember, the
worst case where between 1-2msec on a 3GHz P4.  This was under some
load (make -j64 bzImage).  A big culprit was the mmu-ext hypercall
which in certain cases recursively unpins a page table. Handling
certain page faults also took a while. This was just a preliminary
study so i didn't push the analysis very far.

cheers,

geoffrey







On 5/8/07, Ky Srinivasan <ksrinivasan@xxxxxxxxxx> wrote:
> Since execution sequence within the hypervisor is non-preemptable,  is there an 
> upper bound on time that can be spent in the hypervisor?
>
> Thanks,
>
> K. Y
>
>
>
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