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

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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