[Ukfreebsd] Disabling hyperthreading on Intel CPUs
mark at blackmans.org
Wed Jan 26 09:19:40 GMT 2011
I think you sent this to more lists than you meant to. :)
Out of curiousity, why does one turn off HT?
On Wed, 26 Jan 2011 08:34:17 -0000, andy thomas <andy at time-domain.co.uk>
> Dos anyone know what happned to the machdep.hyperthreading_allowed
> tunable? It was definitely there in (I think) 5.x but in 8.1 it's not:
> andy at dell380:~ $ sysctl machdep.hyperthreading_allowed=0
> sysctl: unknown oid 'machdep.hyperthreading_allowed'
> There are some new CPU sysctls in 8.x but they seem to disable cores
> rather than hyperthreading, which is enabled by default in the kernel. I
> would like to be able to turn off hyperthreading at runtime on a large
> number of HP PCs that are fitted with single quad-core CPUs without
> touching the BIO settings.
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