FreeBSD could use how many cpu(x86) max?

[James Chang]

Dear all,

Does any ever try FreeBSD on box that has more than 16 CPU?

I got an HP ProLiant DL 785 G5 with 32 core (Quad-Core AMD Opteron(tm)
Processor 8356 (2300.10-MHz K8-class CPU) and 256G memory.
When I boot this machine, it could detect 32 core, but only use 16 core!?

What should do to get FreeBSD 7.1 work with 32 core?
Or, FreeBSD 7.1 only 16 Core Max ?

Best Regards!

James Chang
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[John Baldwin]

On Thursday 12 February 2009 3:07:30 am James Chang wrote:
> Dear all,
>
> Does any ever try FreeBSD on box that has more than 16 CPU?
>
> I got an HP ProLiant DL 785 G5 with 32 core (Quad-Core AMD Opteron(tm)
> Processor 8356 (2300.10-MHz K8-class CPU) and 256G memory.
> When I boot this machine, it could detect 32 core, but only use 16 core!?
>
> What should do to get FreeBSD 7.1 work with 32 core?
> Or, FreeBSD 7.1 only 16 Core Max ?

Out of the box FreeBSD only supports 16 CPUs. You can increase that to 32 by
changing MAX_CPU in sys/(amd64|i386)/include/param.h and rebuilding. On
amd64 you can actually bump it up to 64 if desired. I don't make any
promises as to how well the system will perform with that many CPUs enabled
though.

--
John Baldwin

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