19 Nov
2010
19 Nov
'10
10:25 a.m.
On 18/11/10 23:32, MargoAndTodd wrote:
Do you have a rule of thumb as to how many core to assign to a guest? For instance, with an Intel x5650 with 6 real and 12 hyperthreaded cores, how many cores would you assign to the guest?
You may already know this, but don't rely on hyperthreading giving you very much extra. At best it's squeezing some useful work out of what would be a few idle cycles waiting for the instruction pipeline to re-fill. At worst it degrades performance and has been known to be a security hazard.
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.
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