Hyperthreading degrades performance?

Andre Oppermann andre at freebsd.org
Thu Aug 25 18:15:25 GMT 2005

Robert Watson wrote:
> On Thu, 25 Aug 2005, Andre Oppermann wrote:
>> Don't forget better PIV revisions with larger instruction decoder 
>> caches, better cache prefetching and branch prediction.  I doubt much 
>> of the improvement is due to our SMP changes.  A real test to find out 
>> whether it's our work or Intels would be to benchmark an old (pre 
>> Nacona) PIV running 5.3R and 7.0-current vs. a new one doing the same.
> Well, given that my test box for this hasn't changed in three years, I 
> think I can safely argue it's not the hardware :-).

Ok, you win.  :-)

Then the effect of HTT should be much better if you would pop in one
of the latest PIV revisions.


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