On 12/02/2010 08:42 PM, Chris Wright wrote:
OK, let's say a single PCPU == 12 Compute Units.
If the guest is the first to migrate to a newly added unused host, and
we are using either non-trapping hlt or Marcelo's non-yielding trapping
hlt, then that guest is going to get more CPU than it expected unless
there is some throttling mechanism. Specifically, it will get 12CU
instead of 1-3CU.
Do you agree with that?
Yes.
There's definitely a use-case to have a hard cap.
But I think another common use-case is really just performance
isolation. If over the course of a day, you go from 12CU, to 6CU, to
4CU, that might not be that bad of a thing.
If the environment is designed correctly, of N nodes, N-1 will always be
at capacity so it's really just a single node hat is under utilized.
Regards,
Anthony Liguori
thanks,
-chris
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