linux-kernel - Re: clockevents: fix resume logic

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Date:	Tue, 11 Sep 2007 21:52:01 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	john stultz <johnstul@...ibm.com>, Ingo Molnar <mingo@...e.hu>,
	Len Brown <lenb@...nel.org>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Subject: Re: clockevents: fix resume logic

On Tue, 2007-09-11 at 11:44 -0700, Andrew Morton wrote:
> > > there doesn't seem to be a lot of difference in the time handling, except
> > > there are large changes in when things happen in the bootup sequence.
> > 
> > The question is whether the system goes into C2 with the patch applied.
> > 
> > Can you please provide the output of /proc/acpi/processor/CPU0/power for
> > both the bad and the good one ?
> > 
> 
> good:
> 
> sony:/home/akpm> cat /proc/acpi/processor/CPU0/power
> active state:            C0
> max_cstate:              C8
> bus master activity:     00000000
> maximum allowed latency: 8000 usec
> states:
>     C1:                  type[C1] promotion[--] demotion[--] latency[001] usage[00000000] duration[00000000000000000000]
>     C2:                  type[C2] promotion[--] demotion[--] latency[001] usage[00000000] duration[00000000000000000000]
> 
> bad:
> 
> sony:/home/akpm> cat /proc/acpi/processor/CPU0/power
> active state:            C2
> max_cstate:              C8
> bus master activity:     00000000
> maximum allowed latency: 8000 usec
> states:
>     C1:                  type[C1] promotion[C2] demotion[--] latency[001] usage[00000010] duration[00000000000000000000]
>    *C2:                  type[C2] promotion[--] demotion[C1] latency[001] usage[00008316] duration[00000000000170717293]

Ok, here we are. The bad one uses C2 which stops the local apic on the
VAIO. I suspect we end up in the suspend/resume with going into C2
without the broadcast active.

Can you try to get the output of SysRq-Q during the "it needs help from
keyboard" period ?

	tglx




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