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Re: [Xen-users] Dedicating a physical CPU or Hyperthread to dom0? Strang
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| Subject: | Re: [Xen-users] Dedicating a physical CPU or Hyperthread to dom0? Strange test results |
| From: | Javier Guerra Giraldez <javier@xxxxxxxxxxx> |
| Date: | Wed, 22 Aug 2007 05:08:30 -0500 |
| Delivery-date: | Wed, 22 Aug 2007 03:09:27 -0700 |
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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 _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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