"Kernel Hacking"/Developing on a HT CPU versus "physical" CPUs

[mre2007 at cs.columbia.edu]

Dave:

yes this makes sense! So, does the scheduler take this into consideration?

-Marc

> Here is one example:
> If you have dual HT processors, this looks like 4 CPUs to the O/S.
> For performance reasons, the scheduler should not treat them equally.
> If there are two threads to run, they should be put on different physical
> processors (vs. two hyperthreads of the same processor).
>
>
> David Dolson (ddolson at sandvine.com, www.sandvine.com)
>
>
>> -----Original Message-----
>> From: owner-freebsd-smp at freebsd.org
>> [mailto:owner-freebsd-smp at freebsd.org]On Behalf Of
>> mre2007 at cs.columbia.edu
>> Sent: Saturday, September 25, 2004 10:48 AM
>> To: freebsd-smp at freebsd.org
>> Subject: "Kernel Hacking"/Developing on a HT CPU versus
>> "physical" CPUs
>>
>>
>> Hey, I was wondering if from a developing/"kernel hacking"
>> standpoint, are
>> hyperthreading and two "physical" CPUs any different? At what
>> point do the
>> differences have to be taken into consideration when working on the
>> FreeBSD kernel/scheduler/etc? I'm looking to start contributing to the
>> FreeBSD project and am trying to get some hardware set aside.
>>
>> Thanks!
>> -Marc
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>