[luau] Hyper technology

[LinuxDan]

Randall
            Get the January issue of Linux magazine and turn to page 8.  It
fully describes how Redhat7.3 and later support hyperthreading out of the
box.
Also, hyperthreading technology started with the 2.0 chip. It increases
processing speeds up to twice as fast as a dual processor and utilizes the
L1 and L2 cache as well so don't buy into any negative comments about
hyperthreading until you read the facts.  Buy the way, the unit described in
this article was a Dell and came preinstalled with RH7.2.

Dan
Randall Oshita wrote:
> Where can I check in 7.3 to see if its using HT?
> Randall
>

If your hardware and kernel properly supports hyperthreading, then you
would actually see what appears like multiple processors in "top" and
other system monitors, but it is actually your one Pentium4 or Xeon
processor.

Now that I think about it, Red Hat 7.x after all updates uses the same
kernel as Red Hat 8.0, a heavily patched 2.4.18, so even older 7.x
releases can run hyperthreading now.  Only difference with the 7.x
kernel is that they are compiled with the old gcc 2.96 instead of gcc 3.2.

But anyway, in most cases you wont notice much differences with
hyperthreading enabled.  A few specific optimized cases go faster with
hyperthreading, but there's also a few cases where things actually can
go SLOWER with hyperthreading due to one thread killing the L1 or L2
onchip cache used by the other.

Warren


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