Re: "Hyperthreading"

Joseph Tate <jtate@xxxxxxxxxxxxxxxxx> · Mon, 18 Aug 2003 16:24:26 -0400

I don't know about >120GB drives, however, Hyperthreading works in the 
recent Red Hat released 2.4 kernels.  I'm not sure if that's a back port 
from 2.6 or what.  What happens is the kernel sees 2*n processors where 
n is the number of physical processors in the machine.  I.e. if you have 
a 2 proc 2.4 Ghz, the kernel will see 4 processors.  I'm sure that you'd 
have to run the SMP kernel even on a single proc machine.

Joseph

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?

Thanks,
Richard

P.S. In a similar vein: I know we _were_ limited to around 120gb disks
with, say RedHat 7.2. Does this limitation still apply? (I vaguely recall
it had to do with lack of support for ATA-133, IIRC.) If not, got any
details? Thanks again, RT

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