On Tuesday 10 October 2006 16:43, John Baldwin wrote:
> On Tuesday 10 October 2006 14:55, JoaoBR wrote:
> > On Tuesday 10 October 2006 15:11, Brooks Davis wrote:
> > > > My dmesg does not have the line about "Hyperthreading: 2 logical
> > > > CPUs", though. =A0But I had been pretty sure the Athlon64 chips did=
n't
> > > > have any hyperthreading support. =A0Why is the HTT there?
> >
> > HTT is NOT hyperthreading, HT is and HT does not exist on AMD64
>
> Err, no. =A0The HTT there stands for HyperThreading Technology.
you say it right: "stands for" in this case
But I think it "is" the other way round, in terms of abreviation:
HTT =3D Hyper Transport Technology
HT =3D Hyper Threading (Technology)
http://download.intel.com/design/Pentium4/manuals/24896613.pdf
If believe Intel came up with HyperThreading after AMD brought up the term =
HTT=20
and so there was no way to call it HTT but "HT Technology" but this story m=
ay=20
be wrong.
Unluckily (my opinion) in freebsd's i386 kernel (read NOTES) HT technology =
is=20
called HTT CPU.=20
Even if this is certainly ok for whom knows it, then an AMD X2 is definitl=
y=20
not a hyperthreaded processor but has 2 cores as well as Intel's newer Core=
=20
Duo, so HTT for an AMD X2 would be wrong (my opinion again)
on AMD DualCore you see
Cores per package: 2 <<<<<<<
=46reeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
on P4 HT you see
Logical CPUs per core: 2 <<<<<<<
ACPI APIC Table: <INTEL PRODUCT8>
=46reeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
what then at the end is correct but it does not correct the logic error :
HT or HTT is the question but at the end AMD is not HTT, whatever HT or HTT=
=20
then is or stands for
=2D-=20
Jo=E3o
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