Re: [Xen-users] how many VCPUs per physical CPU?

["Olivier B." <xen.list@xxxxxxxxx>]

multiple VCPU can't use more than one CPU ?

Olivier

Peter Peltonen a écrit :
> Hi and thanks for your reply,
>
> On Mon, Jul 6, 2009 at 4:47 PM, Siddharth Wagh<siddharth.wagh@xxxxxxxxx> wrote:
>   
> > The Xen document specifies that upto 32 VCPUs may be allocated to a single
> > domU. But it is recommended that one allocates the same number of VCPUs or
> > less than the number of logical CPUs on your machine, for optimum
> > performance. Since, you have a quad-core processor, the maximum number of
> > VCPUs you could allot to each domU w/o compromising on performance is 4.
> >     
> But what is the benefit of having more VCPUs in a logical CPU?
>
> In what kind of cirumstances does a domU perform better with a 4 VCPUs
> than with 1 VCPU?
>
> I don't undrestand the difference, as in the end there is just one
> logical CPU doing all the work.
>
> Regards,
> Peter
>
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