[CentOS-virt] How many virtual guest 'cpus' can a core duo 'quad' core support

Todd And Margo Chester toddandmargo at gmail.com
Sat Feb 25 01:11:11 EST 2012

On 02/23/2012 11:23 AM, James B. Byrne wrote:
> On Wed, February 22, 2012 12:25, Todd And Margo Chester
>> Therefore, in your given case, think six not twelve.
>> Common advice is
>> to leave
>> one core for the host OS/scheduler.  Which leaves you with
>> 5 physical
>> CPUs to
>> allocate.
> Thank you.  I never planned to allocate to any guest more
> cpus that were physically available.  What I was checking
> was that a single physical cpu with four cores actually
> counted as four cpus insofar as kvm itself was concerned.
> I have allocated guests their processors on the basis that
> 1 core = 1 cpu.  But it occurred to me that core might
> actually mean something different and so I wanted to
> verify my understanding.

You are welcome.  It took me forever to get a straight
answer on this issue (~3 years).  I am glad I could
share it with you.


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