linux-kernel - Re: clockevents: fix resume logic

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Message-Id: <20070911123905.2508e4d2.akpm@linux-foundation.org>
Date:	Tue, 11 Sep 2007 12:39:05 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	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, 11 Sep 2007 21:35:15 +0200
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> > dmesg without the cpuidle patch: http://userweb.kernel.org/~akpm/dmesg-bad.txt
> > dmesg with the cpuidle patch: http://userweb.kernel.org/~akpm/dmesg-good.txt
> > difference: http://userweb.kernel.org/~akpm/dmesg-diff.txt
> > 
> > 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.
> 
> Hm, these things look like they may be related to the suspend/resume problems:
> 
> +Marking TSC unstable due to: possible TSC halt in C2.
> 
> +Clocksource tsc unstable (delta = -458965792 ns)

sort-of.  But look:

akpm:/home/akpm> grep -i tsc dmesg-diff.txt 
+Marking TSC unstable due to: possible TSC halt in C2.
+Clocksource tsc unstable (delta = -458965792 ns)
-Marking TSC unstable due to: cpufreq changes.
-Clocksource tsc unstable (delta = -150503296 ns)

the good and bad kernels seem to be doing quite similar things with the
time management.  But they're doing it at quite different places in the
boot process.

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