Re: HyperThreading and Arriba?

On Mon, 2004-02-23 at 12:23, Theo Schlossnagle wrote:
> Hi Clint,
> 
> I was scouring my email box and found this message.  Did you ever get a
> satisfactory resolution to this problem?
> 

I'm not sure if I'd say its a resolution...

I've taken to manually tweaking arribas on the machines that have
hyperthreading. Since we see a 15 - 25 percent performance increase for
our app with HT, I've been upping the arriba by 20% on the HT machines.
Seems to be working out alright.

Really I think this just exposes Arriba as a "good guess", but not to be
taken as the defacto speed of the machine for all tasks. I'm sure P3's
and Athlons would score lower than P4's in arriba, but perform as well
or better with floating point apps. Its all very subjective.

Thanks for checking back in though. :)

-cb