ULE and Prescott question

RW rwmaillists at googlemail.com
Thu Jul 23 12:22:05 UTC 2009

On Wed, 22 Jul 2009 22:33:46 +0200
Ivan Voras <ivoras at freebsd.org> wrote:

> Scott Bennett wrote:
> >      This is a curiousity question.  I'm running 7.2-STABLE at
> > present on an old Inspiron XPS, which has a 3.4 GHz P4 Prescott
> > CPU.  I have hyperthreading enabled in the kernel.  The question
> > is:  is there any appreciable performance difference to be expected
> > with this hardware setup between the ULE scheduler and the 4BSD
> > scheduler?  Or does the fact that there is only one core eliminate
> > any difference in performance characteristics?
> I'd guess the second thing. It's not like there's cache to be shared
> between cores, etc. 

But with hyperthreading enabled, don't you have virtual CPUs sharing
L1 cache rather that cores sharing L2 cache, making the case for ULE
even stronger?

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