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Message-ID: <48BCC723.3090007@lwfinger.net>
Date: Mon, 01 Sep 2008 23:54:59 -0500
From: Larry Finger <Larry.Finger@...inger.net>
To: Linus Torvalds <torvalds@...ux-foundation.org>
CC: Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>,
"Rafael J. Wysocki" <rjw@...k.pl>,
Alok Kataria <akataria@...are.com>,
Michael Buesch <mb@...sch.de>
Subject: Re: Regression in 2.6.27 caused by commit bfc0f59
Linus Torvalds wrote:
>
> On the machine you have trouble with the PIT on, does this thing trigger?
>
> If it does, that could be a simple way to say whether you prefer PM_TIMER
> over PIT.
>
> For me, even on a modern machine, I get a pit_count of 46321, which
> matches the "about one microsecond for an ISA/LPC read" timing pretty
> well. What do you get?
On the problem AMD K6, the count is 29411. On my almost new AMD Turion
64 X2 that runs at 2.0 GHz, the value was 31401. A cutoff value of
25000 may be a bit close. That machine says that it calibrates against
the PM_TIMER, but cat /sys/devices/...../current_clocksource returns
hpet.
Larry
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