Hypertherading

[Bob Bishop]

Hi,

On 7 May 2009, at 03:55, pluknet wrote:

> 2009/5/7 Barney Cordoba <barney_cordoba at yahoo.com>:
>>
>> I just got a shiny new nehalem box and it comes up with 16  
>> processors with dual quads installed. Is there any benefit or  
>> should hyperthreading be disabled?
>>
>
> Hi. There is a measurable win if hyperthreading is enabled [1].

AFAICS the reference doesn't support that conclusion at all.

> You can switch it off via machdep.hyperthreading_enabled loader  
> tunable.
>
> [1] http://lists.freebsd.org/pipermail/freebsd-stable/2009-January/047460.html

--
Bob Bishop
rb at gid.co.uk