linux-kernel - Re: Unified tracing buffer

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Message-ID: <48D90B84.4030905@redhat.com>
Date:	Tue, 23 Sep 2008 11:30:12 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
CC:	Martin Bligh <mbligh@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>, darren@...art.com,
	"Frank Ch. Eigler" <fche@...hat.com>,
	systemtap-ml <systemtap@...rces.redhat.com>
Subject: Re: Unified tracing buffer

Mathieu Desnoyers wrote:
> * Masami Hiramatsu (mhiramat@...hat.com) wrote:
> [...]
>> $ cat /proc/cpuinfo
>> processor	: 0
>> vendor_id	: GenuineIntel
>> cpu family	: 6
>> model		: 15
>> model name	: Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
>> stepping	: 6
>> cpu MHz		: 1000.000
> [...]
> 
> ... @ 2.00GHz and cpu MHz : 1000.000 ; isn't that a bit odd ? (same for
> both cpus)

2.00GHz is the maximum(model) frequency. And 'cpu MHz' means
current frequency. (yep, now I'm using cpufreq)
Anyway, when I measured TSC drift, I killed cpuspeed service and
fixed freq to 2000. ;-)

Thank you,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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