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From: David Brownell <david-b@pacbell.net>
To: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Subject: Re: 2.6.25 regression: powertop says 120K wakeups/sec
Date: Fri, 28 Mar 2008 17:15:19 -0700
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Cc: "Andrew Morton" <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
       "Rafael J. Wysocki" <rjw@sisk.pl>, linux-acpi@vger.kernel.org,
       "Len Brown" <lenb@kernel.org>
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On Friday 28 March 2008, Pallipadi, Venkatesh wrote:
> 100% C0 is not real reading. The problem behind that is there is no wat
> to measure exact C1 idle time with halt based C1s. So, we always used to
> report 0 time in acpi and that's what is reported by powertop.
> This should be fixed in future, as we now export approx time (even
> though not exact) in cpuidle and powertop is about to start using it.

I just pulled the latest powertop SVN and see it's smarter now.
It says over 90% in C1 (doing normal desktop stuff), with nasty
IRQ rates but that's the fault of silly desktop code.  ;)

- Dave

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