Re: [Xen-devel] Real-time support

["Ky Srinivasan" <ksrinivasan@xxxxxxxxxx>]

Thanks Geoffrey. 

Regards,

K. Y

>>> On Tue, May 8, 2007 at  4:39 PM, in message
<c3c918090705081339j2439155j30381e55c51ad418@xxxxxxxxxxxxxx>, "Geoffrey
Lefebvre" <geoffrey@xxxxxxxxx> wrote: 
> 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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>>



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