hyperthreading

[LuMiWa]

On Thu, 15 Apr 2021 17:29:11 -0700
Pete Wright <pete at nomadlogic.org> wrote:

> 
> 
> On 4/15/21 4:25 PM, LuMiWa via freebsd-questions wrote:
> > H1!
> >
> > I have FreeBSD 13.0-RELEASE on Thinkpad T495. For now I had just
> > Intel processors and T495 has
> >
> > Machine class:	amd64
> > CPU Model:	AMD Ryzen 5 PRO 3500U w/ Radeon Vega Mobile Gfx
> > No. of Cores:	8
> >
> > I had hyperthreading disabled in boot/loader.conf:
> >
> > machdep.hyperthreading_allowed=0
> > Is with AMD processors the same. I had also installed devcpu-data.
> > Should I do the same on the laptop, please?
> 
> yes i believe the same loader knob is used for AMD cpu's.  here's one
> of my hosts with an Epyc CPU:
> CPU: AMD EPYC 7302P 16-Core Processor                (3000.06-MHz 
> K8-class CPU)
> 
> $ sysctl machdep.hyperthreading_allowed
> machdep.hyperthreading_allowed: 1
> $ sysctl hw.ncpu
> hw.ncpu: 32
> $
> 
> 
> cheers,
> -pete
> 

Thank you.

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