From: Stephane Eranian <eranian@hpl.hp.com>
To: linux-kernel@vger.kernel.org
Cc: perfmon@napali.hpl.hp.com, Stephane Eranian <eranian@hpl.hp.com>
Subject: exposing FSB clock speed in /sys
Date: Fri, 30 Mar 2007 07:39:37 -0800 [thread overview]
Message-ID: <20070330153937.GC16059@frankl.hpl.hp.com> (raw)
Hello,
It seems that the kernel does not expose the Front-Side Bus (FSN) Clock
speed to user applications. I found code in the kernel dealing with
frequency scaling that extracts the information for x86 processors but
the value is never exposed.
Knowledge the the FSB speed is very useful to monitoring tools. It is used
to compute certain bus-related metrics.
Looking at the code, it seems that there is no standard way of extracting
the FSB speed. For each processor model, you have different MSRs. I would
think that the routines in the cpufreq code could be moved out and used
as the basis to expose the information somewhere in /sys.
Any comments?
--
-Stephane
next reply other threads:[~2007-03-30 15:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-30 15:39 Stephane Eranian [this message]
2007-03-30 15:49 ` exposing FSB clock speed in /sys Arjan van de Ven
2007-03-30 18:20 ` Alan Cox
2007-03-30 18:44 ` [perfmon] " Martin Cracauer
2007-03-31 2:31 ` Andi Kleen
2007-03-31 8:18 ` Stephane Eranian
2007-03-31 10:02 ` Andi Kleen
2007-04-02 16:14 ` Lennart Sorensen
2007-04-02 20:52 ` Stephane Eranian
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