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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
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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