Re: [Xen-users] Dedicating a physical CPU or Hyperthread to dom0? Strange test results

[Javier Guerra Giraldez <javier@xxxxxxxxxxx>]

Dominik Klein wrote:
> CPU1 = HT1 + HT2
> CPU2 = HT3 + HT4
Are you positively sure on this? i think Linux enumerates differently to 
make it easier to spread load, so it might be
CPU1 = HT1 + HT3
CPU2 = HT2 + HT4

which would mean a totally different interpretation to your experiments.

and, of course two processes running on different HTs on the same CPU 
will affect each other's performance.  a multithreaded CPU doesn't have 
any more ALUs, cache, schedulers, etc. than a singletreaded one; it just 
have another set of state registers, making it easy to switch from one 
instruction stream to another.  the advantage comes from giving the CPU 
something else to do while one thread stalls because of a cache miss, or 
an inter-instruction dependency.
--
Javier

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