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[Xen-users] Y it is not good to assign cpu core to vm

On many Online reference on xen,they are mentioning about assigning vm to physical CPU core rather than setting the affinity to "any cpu".
Can there be any performance improvement if we do in this way.
Will this make Credit scheduler to limit to few choices and results in poor scheduling.
If it really improves performance then how to do this if we have 4 cores and 8 vms to run.With most vm performing i/o intensive tasks.

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