Date: Wed, 11 Mar 2015 00:50:33 +0000 From: "Pokala, Ravi" <rpokala@panasas.com> To: Alan Somers <asomers@freebsd.org>, Freddie Cash <fjwcash@gmail.com> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, "lokadamus@gmx.de" <lokadamus@gmx.de>, Rui Paulo <rpaulo@me.com> Subject: Re: detecting hyperthreading Message-ID: <D124DE10.12F8B8%rpokala@panasas.com> In-Reply-To: <CAOtMX2i6MOyHKc08GgyMgsxWcCWUUCTd2qHSnY=9WaZhUm2xdA@mail.gmail.com> References: <D12358C5.12F652%rpokala@panasas.com> <9F2E1411-B517-4BC8-AF61-BB15EE35083C@me.com> <D123957A.12F6CA%rpokala@panasas.com> <54FF1343.1020705@gmx.de> <D1246191.12F7D6%rpokala@panasas.com> <CAOjFWZ594OKAZ95ybegKiu%2BKr4-YeEZfJGVmv1obhxeZjVVbNA@mail.gmail.com> <CAOtMX2i6MOyHKc08GgyMgsxWcCWUUCTd2qHSnY=9WaZhUm2xdA@mail.gmail.com>
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-----Original Message-----
From: Alan Somers <asomers@freebsd.org>
Date: 2015-03-10, Tuesday at 09:07
To: Freddie Cash <fjwcash@gmail.com>
Cc: Ravi Pokala <rpokala@panasas.com>, "freebsd-hackers@freebsd.org"
<freebsd-hackers@freebsd.org>, "lokadamus@gmx.de" <lokadamus@gmx.de>, Rui
Paulo <rpaulo@me.com>
Subject: Re: detecting hyperthreading
>I always look at "sysctl kern.sched.topology_spec" to tell if
>hyperthreading is enabled. It's overkill, but it works.
Yeah, David pointed me at that yesterday. It should be easy enough to take
the same source data and create something that just returns the numbers.
(i.e. kern.sched.active_{sockets,cores,threads}).
-Ravi
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