linux-kernel - Re: [patch-mm 00/25] High resolution timer updates and x86_64 support

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Date:	Mon, 18 Jun 2007 16:06:31 -0400
From:	Valdis.Kletnieks@...edu
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...l.org>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	Chris Wright <chrisw@...s-sol.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Subject: Re: [patch-mm 00/25] High resolution timer updates and x86_64 support - V2

On Sat, 16 Jun 2007 10:36:00 -0000, Thomas Gleixner said:
> The following patch series contains:
> 
> - dyntick bugfixes for -mm (caused by the cpuidle changes in ACPI)
> 
> - updates and improvements to high resolution timer / dynticks 
> 
> - high resolution timer / dynticks support for x86_64

Am running with the 22-rc4-mm2-hrt4 patch on my Latitude D820.  Mostly seems
to work, but for some reason the Intel 'powertop' util thinks it's 100% busy:

     PowerTOP version 1.7       (C) 2007 Intel Corporation

Cn          Avg residency (5s)          P-states (frequencies)
C0 (cpu running)        (100.0%)
C1                0.0ms ( 0.0%)         2.00 Ghz     0.0%
C2                0.0ms ( 0.0%)         1.67 Ghz     0.0%
C3                0.0ms ( 0.0%)         1333 Mhz     0.0%
                                        1000 Mhz   100.0%

In reality:

[/sys/devices/system/cpu/cpu0/cpuidle] for i in */*; do echo -n "$i: "; cat $i; done
state0/latency: 1
state0/power: 1000
state0/time: 0
state0/usage: 3
state1/latency: 1
state1/power: 500
state1/time: 1756017623
state1/usage: 1837402
state2/latency: 57
state2/power: 100
state2/time: -159524787
state2/usage: 15007443

I think we have a 32/64 bit issue on state2/time which is probably borking
things up....


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