Hyper Threading on P4

[Gary Stainburn]

On Wednesday 01 Sep 2004 6:29 pm, John McBride wrote:
> Matthias Bauw wrote:
> >hi,
> >
> >I was in fact wondering how to get the most out of my P4 3.0Ghz with
> >Hyper Threading.
>
> Watch out that the intel marketing monster doesn't kick you in the
> shorts. You still have only one CPU. Turning virtual CPUs on in our
> dual P4 boxes ("four"  CPUs) severely degraded the box performance.
> In many cases all turning on virtual CPUs does is make linux, under
> certain loads, to think "hey, I can shuffle things off to another
> CPU"--false in this case (it's the same CPU)  and there is overhead
> to swapping processes between CPUs, thus yielding "less than 0"
> performance increase.

Does this mean that with my FC1 install, with a P4 and using the 
defaulted SMP kernel is not the best option?

Would I be better running the non-SMP kernel that was also installed as 
an option?

>
> ---
> John

-- 
Gary Stainburn
 
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