Date: Sat, 2 Feb 2019 13:03:03 -0500 (EST) From: Chris Hill <chris@monochrome.org> To: Mayuresh Kathe <mayuresh@kathe.in> Cc: freebsd-questions@freebsd.org, owner-freebsd-questions@freebsd.org Subject: Re: Checking CPU capabilities Message-ID: <alpine.BSF.2.20.1902021259560.44144@tripel.monochrome.org> In-Reply-To: <13203a3c47f8f0f1c3c408fd3cc6a1c6@kathe.in> References: <2cd8b8b1ae06042a992a48faace1ca91@kathe.in> <alpine.BSF.2.20.1902021114310.44144@tripel.monochrome.org> <13203a3c47f8f0f1c3c408fd3cc6a1c6@kathe.in>
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On Sat, 2 Feb 2019, Mayuresh Kathe wrote: > On 2019-02-02 09:46 PM, Chris Hill wrote: >> On Sat, 2 Feb 2019, Mayuresh Kathe wrote: >> >>> Under Linux it is `cat /proc/cpuinfo` >>> Under Solaris it is `isainfo -v` >>> What is it under FreeBSD 12? >> >> Something like >> $ grep Features /var/run/dmesg.boot >> ...or am I missing something? > > I need to know if my processor supports AVX, AVX2, AVX-512, SIMD, etc. > Would your approach give me that sort of information? I think it would. On one machine I get: $ grep Features /var/run/dmesg.boot | grep AVX Features2=0x3d9ae3bf<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,POPCNT,TSCDLT,XSAVE,OSXSAVE,AVX,F16C> ...and on another I get bupkis: $ grep Features /var/run/dmesg.boot | grep AVX $ So I gather that the first machine has AVX support and the second does not. -- Chris Hill chris@monochrome.org
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