Hyperthreading degrades performance?

Robert Watson rwatson at FreeBSD.org
Thu Aug 25 18:13:16 GMT 2005

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 :-).

Robert N M Watson

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