Hyperthreading in FreeBSD 4.9

[Sven Pfeifer]

Hi,

John Palmer <drgnut at hotmail.com> wrote:
> I currently have FreeBSD 4.8 with hyperthreading enabled. I just did a 
> cvsup to FreeBSD 4.9 and when I do a make buildkernel KERNCONF=FOO  I get 
> an error of   unknown option "HTT".  Has hyperthreading been disabled in 
> FreeBSD 4.9?

did you read 

        /usr/src/UPDATING

---8<--
20031022:
        Support for HyperThread logical CPUs has now been enabled by
        default.  As a result, the HTT kernel option no longer exists.
        Instead, the logical CPUs are always started so that they can
        handle interrupts.  However, the extra logical CPUs are prevented
        from executing user processes by default.  To enable the logical
        CPUs, change the value of the machdep.hlt_logical_cpus from 1 to
        0.  This value can also be set from the loader as a tunable of
        the same name.
-->8---

HTH

Cheers

	Sven

-- 
"640 kB RAM should be enough for everyone" --Bill Gates, 1981
------------------------------------------------------[rand. sig. #27]