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

[Dave Dolson]

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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