linux-kernel - Re: Fw: [BUG 2.6.21-rc7] acpi_pm clocksource loses time on x86-64

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Message-Id: <200705040742.l447gJPR027148@harpo.it.uu.se>
Date:	Fri, 4 May 2007 09:42:19 +0200 (MEST)
From:	Mikael Pettersson <mikpe@...uu.se>
To:	johnstul@...ibm.com, mikpe@...uu.se
Cc:	ak@...e.de, len.brown@...el.com, linux-kernel@...r.kernel.org,
	tglx@...utronix.de
Subject: Re: Fw: [BUG 2.6.21-rc7] acpi_pm clocksource loses time on x86-64

On Thu, 03 May 2007 19:38:50 -0700, john stultz wrote:
> > 	So that slow acpi_pm on x86_64 seems to be connected w/ the idle loop.
> > I'm guessing the chipset halts the ACPI PM in lower C states. Do you
> > have any guesses as to what might differ between x86_64 and i386 ACPI
> > idle loops? Or might this be something different in what the BIOS
> > exports in x86_64 mode or i386 mode?
> 
> Mikael,
> 	Just trying to dig a bit more through the acpi_processor_idle code.
> Could you run "cat /proc/acpi/processor/CPU1/power" and reply w/ the
> output?

Here's that file with the x86-64 kernel:

active state:            C2
max_cstate:              C8
bus master activity:     00000000
maximum allowed latency: 20000 usec
states:
    C1:                  type[C1] promotion[C2] demotion[--] latency[000] usage[00107840] duration[00000000000000000000]
   *C2:                  type[C2] promotion[--] demotion[C1] latency[010] usage[-1987043693] duration[00000000003044809185]

/Mikael
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