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Date:      Sat, 9 Nov 2013 01:25:39 -0800
From:      Adrian Chadd <adrian@freebsd.org>
To:        Warren Block <wblock@wonkity.com>
Cc:        Dan Nelson <dnelson@allantgroup.com>, FreeBSD Mailing List <freebsd-questions@freebsd.org>, aurfalien <aurfalien@gmail.com>
Subject:   Re: CPU Turbo mode
Message-ID:  <CAJ-VmompRXZURweoz85E1A7x6iYJ-Gp5rWx0F9e1W7wq54ZZhA@mail.gmail.com>
In-Reply-To: <alpine.BSF.2.00.1311081704080.84892@wonkity.com>
References:  <70EC0F10-FAD0-4EA6-8C1F-A95B1C786B7B@gmail.com> <20131031153757.GG63947@dan.emsphone.com> <4A2AEF45-5185-4ED7-98BD-B6975C79A5B9@gmail.com> <alpine.BSF.2.00.1311081704080.84892@wonkity.com>

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On 8 November 2013 16:08, Warren Block <wblock@wonkity.com> wrote:

> When it shows 2201, it's in Turbo mode.  I don't know if there is anywhere
> that shows the actual speed of the single core that is going faster.

I enabled this on a 4-core sandy bridge (E3-1260L IIRC) and all four
cores suddenly grew a few % more clock cycles. But, it was on a server
whose fans are cranked high anyway, so the CPU temperature only grew a
degree or two.

I think Turbo Boost is boosting all cores that have work on it; it's
up to the thread/process scheduler to keep the thermal envelope such
that the overclocking works.


-adrian



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