Subject: Re: hyperthreading on 2.0; no way to get it to work with my hardware.
To: None <>
From: okay_awright <>
List: tech-smp
Date: 12/30/2004 19:27:12
thanks for your quick answer,

regarding this motherboard it is explictly advertised in the asus doc
that hyper threading is enabled by default and that there is no options
available to tweak it.
Furthermore quoting their FAQ:
*    Q - How to disable HyperThreading on P4V800-X or P4V8X-X?
*    A - We cannot disable HyperThreading on P4V800-X/P4V8X-X due to
hardware limitation.

I've already flashed this card with the latest bios revision (about a
month old) and it seems that it only brings support for new processors
(read in their changelog: no bug fix, no enhanced feature since a very
long time).

thanks again, it now really seems that i will not get hyper threading

best regards,

[PGP key on request]

Christos Zoulas a =E9crit :

>In article <>,
>okay_awright <> wrote:
> =20
>>ATT: this message has already been posted on netbsd-help on 12/27/04=20
>>w/out any answer yet
>>hi everyone,
>>this a relatively common question and i hope easily solvable.
>>I have a NetBSD 2.0 (release, updated from a 1.6.2) system running on a=
>>Asus P4V8X-X (latest bios) with an Intel Pentium 4 2.40A. This is only =
>>workstation but I really wanted to get hyperthreading support (and
>>that's why i moved from 1.6.2 release to 2.0 release).
>>Back to the problem in itself: no matter which modifications i could
>>make in my kernel configuration file, i can't get hyper-threading suppo=
>>In the enclosed part is my current kernel conf file, everything works a=
>>expected but SMP.
>>Activating either MPBIOS or MPACPI alone doesn't help (MPBIOS hangs the=

>>Just to be sure I used the plain GENERIC.MP file (mine was originally
>>made for 1.6.1 and updated) just slightly modified (with MPACPI and
>>acpi0 on) but i get the same result: no usable second "virtual" process=
>>My motherboard BIOS is an AMIBIOS; the only options i can customize
>>regarding hyperthreading support are the MPS (1.1 versus 1.4; 1.4 is
>>selected) and ACPI (2.0 or not; 2.0 is selected) revisions in use.
>>Nothing much but dmesg shows me that the processor is already HTT ready=
>>may someone help me; i'm clueless. If one could take some time analyzin=
>>the configuration file or giving me some advices...
>>   =20
>The hyperthreading support is found in the ACPI bios. From
>the looks of it, your processor supports hyperthreading but the bios
>does not advertise it. There is either a bios setting that you have not
>found, or this is a limitation in your bios. There could be an updated
>bios available that has this feature. You might also want to try to
>boot windows to see if it sees the hyperthreaded processor.
> =20