From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Len Brown <lenb@kernel.org>
Cc: Zdenek Kabelac <zdenek.kabelac@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
cpufreq@vger.kernel.org
Subject: Re: Perfomance governor is still changing frequency
Date: Tue, 23 Dec 2008 17:56:00 +0000 [thread overview]
Message-ID: <20081223175600.GB17426@srcf.ucam.org> (raw)
In-Reply-To: <alpine.LFD.2.00.0812151242430.16823@localhost.localdomain>
On Mon, Dec 15, 2008 at 12:59:15PM -0500, Len Brown wrote:
> and that will tell us if turbo is related to your
> occasional obervance of low-frequency-mode.
We've observed this on certain other pieces of modern Intel hardware -
the best hypothesis we've been able to come up with is that if the msr
read is the first instruction run on the core when it's previously been
in a deep C state, the low-clock speed is reported. However, some
Thinkpads will also automatically limit their speed for thermal reasons.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2008-12-23 17:56 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-15 13:15 Perfomance governor is still changing frequency Zdenek Kabelac
2008-12-15 17:59 ` Len Brown
2008-12-23 17:56 ` Matthew Garrett [this message]
2008-12-15 20:53 ` Tim Blechmann
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