Re: "Hyperthreading"

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On Mon, 18 Aug 2003, Richard Troy wrote:

> 
> 
> Hi guys,
> 
> I'm just wondering: We just recently - last weekend - decided to "move
> into the modern era" on one of our server boxes running RedHat Linux. Our
> hardware selection was P4 2.6ghz, 800mhz fsb, with a gig of main memory on
> an Intel brand mother board with integrated 1000 Base-T nic. Along the
> way, I noticed that the bios has an option to turn on or off
> "Hyperthreading" - which I presume is just a flavor of pipelining - and
> the supporting documentation warns to not use hyperthreading if your OS
> does not support it...
> 
> OK, you saw it coming a mile away: What versions of Linux, if any, support
> hyperthreading? If not, any idea when?

I believe hyperthreading is fine with the latest kernels: you want SMP.
However, I am not sure you actually have it: it came in on the non-Xeon
CPUs when they reached/passed 3 Ghz, and I don't know whether Intel
introduced new slower CPUs with it. The fact you have the BIOS option is
a good indicator that the mobo supports those CPUs, but whether you have
one is another question.


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