Re: only one logical CPU used in Xeon

Hyperthreading is enabled in BIOS, but the variable:

machdep.hyperthreading_allowed

is '0' by default in FreeBSD 6.2R :(((
I just changed it now to '1' and all cores in all CPUs started to  
work :)))

Very simple change and so much power more :)

Thanks a lot for this hint!!

Regards,
Robert

On Mar 10, 2009, at 3:19 PM, Lucas Holt wrote:

> Have you tried the hyperthreading setting?
>
> machdep.hyperthreading_allowed=1
> (put that in /etc/sysctl.conf)
>
> On Mar 10, 2009, at 6:40 AM, Robert Heron wrote:
>
>> Hi,
>>
>> I have FreeBSD 6.2R running on Intel SE7501HG2 motherboard with two  
>> Xeon installed.
>> System detects 2 CPUs with 2 cores in each of them (total 4 cores)  
>> but it uses only one core in each Xeon (total 2 of 4 cores are used  
>> only).
>> I see it in the 'top'. I tried the same hardware on FreeBSD 7.1R  
>> and this OS uses all of the detected cores.
>>
>> What should I do FreeBSD 6.2R to use all of the available cores?
>> I cannot upgrade it to 7.x, must use 6.x
>>
>> Regards,
>> Robert Heron
>>
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>
>
>
> Lucas Holt
> [e-mail]
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>

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