linux-kernel - Re: [BUG] jiffies counter leaps in 2.6.24-rc3

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Message-ID: <20071129185743.46daa8ad@morte>
Date:	Thu, 29 Nov 2007 18:57:43 +0100
From:	Stefano Brivio <stefano.brivio@...imi.it>
To:	Dave Jones <davej@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	linux-kernel@...r.kernel.org, Michael Buesch <mb@...sch.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [BUG] jiffies counter leaps in 2.6.24-rc3

On Thu, 29 Nov 2007 12:45:48 -0500
Dave Jones <davej@...hat.com> wrote:

> Hmm, what's
> in /sys/devices/system/clocksource/clocksource0/current_clocksource  ?

morte st3 # cat /sys/devices/system/clocksource/clocksource0/current_clocksource
acpi_pm
 
> adjust_jiffies() always gets called on a speed transition. I'm wondering
> if perhaps we shouldn't do that if we're using something other than
> the tsc for timekeeping.

I gave other clocksources a try:

morte st3 # cat /sys/devices/system/clocksource/clocksource0/available_clocksource
acpi_pm pit jiffies tsc

Setting tsc as current clocksource:
morte st3 # echo tsc > /sys/devices/system/clocksource/clocksource0/current_clocksource
[13367.729060] Time: tsc clocksource has been installed.
didn't fix anything. Other weirdness here: it looks like it affects my
typematic delay and repeat rate.

Setting jiffies or pit as current clocksource didn't fix anything, but at
least it doesn't cause anything bad.

Do you want me to comment out adjust_jiffies() and see what happens?


-- 
Ciao
Stefano
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