Re: Detection of HTT

Wilkinson, Alex wrote:
> Why is HTT turned off out of the box ? I thought HTT was meant to be a
> hardware 'performance enhancing' feature.
> 
> Why do we disable it ?
> 
>  - aW

FreeBSD will use HTT if the system has it enabled (usually controlled in
the BIOS) and the kernel is compiled for SMP.  There are ways to
manually disable HTT but leave SMP enabled in the OS, but the default is
to use it if the above two requirements are met.  However, the OS
scheduler is not HTT-aware, so HTT will give a somewhat mixed
performance.

Scott