Date: Thu, 15 Apr 2021 17:29:11 -0700 From: Pete Wright <pete@nomadlogic.org> To: LuMiWa <lumiwa@dismail.de>, FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: hyperthreading Message-ID: <e72a03bf-00e1-ddb8-3829-f818589af9fc@nomadlogic.org> In-Reply-To: <20210415192527.49375f7f@dismail.de> References: <20210415192527.49375f7f@dismail.de>
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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 -- Pete Wright pete@nomadlogic.org @nomadlogicLA
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