Re: Identification of HTT cores on newer (CPUID leaf 11) Intel

On Sep 16, 2011, at 8:07 AM, John Baldwin wrote:
> I think the "right" way for an admin to disable HTT is to disable it =
in the
> BIOS so that it doesn't show up in the MADT.  Back when we were doing =
the
> MPTABLE_FORCE_HTT hack having a separate tunable made sense (and it =
possibly
> made some limited sense if you were worried about the vulnerability on =
running
> machines).  However, at this point I think the tunable should just go =
away and
> admins should configure HTT on or off in the BIOS like they would for =
any
> other OS.
>=20
> --=20
> John Baldwin


To do it this way (leave SMT enabled in the BIOS but disabled in the OS) =
makes it easier to release a future upgrade to take advantage of those =
cores.  Once systems are distributed to customer sites it becomes very =
difficult to do BIOS maintenance.

-Andrew

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Andrew Boyer	[e-mail]




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