xeon 2.8GHz SMP/NOT test results

[Attilio Rao]

2006/10/16, Kian Mohageri <kian.mohageri at gmail.com>:
> On 10/16/06, Ivan Voras <ivoras at fer.hr> wrote:
> >
> > Ok, but take care so that the machine is *completely* idle while you
> > doing the tests, otherwise they don't mean anything.
> >
>
>
> Understood.
>
> I noticed somebody suggested trying SMP with hyperthreading disabled in the
> BIOS, and I'm a little bit confused as to what sort of results should I
> expect from that.  Could anybody enlighten me about how the OS will see/make
> use of this?
>
> My next test(s) will probably be:
>
> - "SMP w/ HTT" vs. "GENERIC w/ HTT disabled in BIOS" vs. "SMP w/ HTT
> disabled in BIOS"
> - both lmsensors and unixbench tests
> - timecounter comparisons

I think that you might do a real comparison using the same kernel w/
only these slight differences (read: not using GENERIC vs.
custom-kernel):

disable HTT in BIOS:
- kernel w/o SMP (w/o PREEMPTION+FULL_PREEMPTION)
- kernel w/ SMP (w/o PREEMPTION+FULL_PREEMPTION)
- kernel w/o SMP (w/ PREEMPTION+FULL_PREEMPTION)
- kernel w/ SMP (w/ PREEMPTION+FULL_PREEMPTION)

enable HTT in BIOS, active HTT in the kernel and do again these tests
(you might have an 8 cases situation to show).

Attilio


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