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xen-users
Re: SMP does not work as expected - was: Re: [Xen-users] Checking for SM
Dirk H. Schulz wrote:
>> Name Id Mem(MB) CPU State Time(s)
>> Console
>> Domain-0 0 123 0 r----
>> 59931.7
>
>
>> webdynown01 5 511 1 -b---
>> 193.5 9605
>> webstatown01 1 255 0 -b---
>> 202.9 9601
You have a Xeon, which supports hyperthreading, and Xen treats the
hyperthreaded CPU as two virtual CPUs. That's pretty much typical, and
pretty much the way most OSes see a hyperthreaded CPU.
>> So it seems that on dual processor boards smp is somehow simulated if
>> there is just one processor present.
>>
>> Is this a bug, or does it make sense somehow?
It's not a bug. It does make perfect sense.
>> And now my original question comes up again: How can I - reliably -
>> verify that my xen kernel is running smp code?
Run 'xm info' and look at the 'cores' and 'hyperthreads_per_core'
fields? If there are multiple physical CPUs (or in the case of e.g. a
dual-core Opteron, you'll see 2 cores for each CPU), and
'hyperthreads_per_core' will be 2 on Xeon CPUs and HT-capable P4 CPUs
(assuming you haven't turned off hyperthreading in the BIOS, or passed
arguments to Xen itself causing it to ignore the MP tables).
--
Derrik Pates
demon@xxxxxxxxxxxxx
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