linux-kernel - Re: 2.6.25 regression: powertop says 120K wakeups/sec

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Date:	Fri, 28 Mar 2008 14:09:09 -0700
From:	David Brownell <david-b@...bell.net>
To:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	linux-acpi@...r.kernel.org, Len Brown <lenb@...nel.org>
Subject: Re: 2.6.25 regression: powertop says 120K wakeups/sec

On Friday 28 March 2008, Venki Pallipadi wrote:
> Can you send me the output of
> # grep . /sys/devices/system/cpu/cpu*/cpuidle/*/*
> with upstream kernel.

This is "upstream" to 3085354de635179d70c240e6d942bcbd1d93056c:

/sys/devices/system/cpu/cpu0/cpuidle/state0/desc:CPUIDLE CORE POLL IDLE
/sys/devices/system/cpu/cpu0/cpuidle/state0/latency:0
/sys/devices/system/cpu/cpu0/cpuidle/state0/name:C0
/sys/devices/system/cpu/cpu0/cpuidle/state0/power:4294967295
/sys/devices/system/cpu/cpu0/cpuidle/state0/time:0
/sys/devices/system/cpu/cpu0/cpuidle/state0/usage:0
/sys/devices/system/cpu/cpu0/cpuidle/state1/desc:<null>
/sys/devices/system/cpu/cpu0/cpuidle/state1/latency:0
/sys/devices/system/cpu/cpu0/cpuidle/state1/name:C1
/sys/devices/system/cpu/cpu0/cpuidle/state1/power:0
/sys/devices/system/cpu/cpu0/cpuidle/state1/time:2781727265
/sys/devices/system/cpu/cpu0/cpuidle/state1/usage:927242422

... as I mentioned, powertop says C2 doesn't get used any more,
moreover that only C0 ever gets used.  The "usage" seems to be
saying otherwise.


> Below is a test patch which should effectively revert commit bc71bec91f987
> Can you check with this patch on latest git and see whether things come back
> to normal.

I'll get back to you with results.

 
> Also, it will help if you can send the output of acpidump from this system.

Sent off-list.

- Dave

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