dual-core vs. HyperThreading
Thomas Charron
twaffle at gmail.com
Wed Apr 25 19:29:42 EDT 2007
On 4/25/07, Michael ODonnell <michael.odonnell at comcast.net> wrote:
> > I can definitely confirm that my core 2 quad system has no HT
> > available to turn on in the bios (but does show ht in the cpuflags,
> > which aligns with other comments in the thread).
> I've heard it suggested several times now that features
> like HyperThreading can be enabled or disabled "in the BIOS"
> and I don't understand how that can be possible. AFAIK a CPU
> either does or doesn't have a given feature and there's nothing
> (short of modifying the CPU's microcode) that any BIOS can do
> to "disable" it, at least not in any way that would prevent a
> capable OS from doing as it pleased once it was booted. So,
> what's the story?
I don't know the specifics, but the BIOS has to 'turn the bits on'.
There are thousands of Toshiba laptop owners who wished Toshiba would
enable the VT bit in their damned BIOS screens for their Intel Core 2
Duo chips.
--
-- Thomas
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