Re: [Xen-users] Odd number of VCPU and performance impact?

[mad Engineer <themadengin33r@xxxxxxxxx>]

Thanks Niel,
                  I have CPU pinning enabled and pinned to proper PCPU
,but my question is will there be any performance issue if we use odd
number of VCPU.

On Sat, Jan 17, 2015 at 12:55 PM, Niels Dettenbach (Syndicat IT &
Internet) <nd@xxxxxxxxxxxx> wrote:
> Am 16. Januar 2015 22:35:09 MEZ, schrieb mad Engineer 
> <themadengin33r@xxxxxxxxx>:
>>Hi all,
>>      Is it good practice to always create vm with even number of VCPU?
> A little more correct:
> You get more performance and less overhead if you connect/pin cpu cores which 
> are hardly interconnected in a CPU system together in favor of cores  which  
> are less  interweaved/connected. Most modern CPUs from Intel and AMD has 
> "doublettes" of interconnected "cores"  (or "threads")  in their CPUs which  
> could  much better  share work then cores/threads which  are in a "wider 
> distance"  (on different pairs or  different cpu chassis.
>
>
> hth a bit
> cheerioh,
>
>
> Niels.
> --
> Niels Dettenbach
> Syndicat IT & Internet
> http://www.syndicat.com

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