From: Larry Finger <Larry.Finger@lwfinger.net>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Alok Kataria <akataria@vmware.com>, Michael Buesch <mb@bu3sch.de>
Subject: Re: Regression in 2.6.27 caused by commit bfc0f59
Date: Mon, 01 Sep 2008 23:54:59 -0500 [thread overview]
Message-ID: <48BCC723.3090007@lwfinger.net> (raw)
In-Reply-To: <alpine.LFD.1.10.0809012033280.3210@nehalem.linux-foundation.org>
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
next prev parent reply other threads:[~2008-09-02 4:55 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-31 22:54 Regression in 2.6.27 caused by commit bfc0f59 Larry Finger
2008-09-01 11:14 ` Thomas Gleixner
2008-09-01 15:37 ` Larry Finger
2008-09-01 17:49 ` Thomas Gleixner
2008-09-01 17:44 ` Larry Finger
2008-09-01 18:31 ` Thomas Gleixner
2008-09-01 19:10 ` Linus Torvalds
2008-09-01 20:07 ` Thomas Gleixner
2008-09-01 21:30 ` Thomas Gleixner
2008-09-01 22:02 ` Linus Torvalds
2008-09-01 22:33 ` Thomas Gleixner
2008-09-01 22:56 ` Linus Torvalds
2008-09-01 23:24 ` Thomas Gleixner
2008-09-02 6:37 ` Andi Kleen
2008-09-02 12:21 ` Thomas Gleixner
2008-09-01 22:16 ` Linus Torvalds
2008-09-01 23:16 ` Thomas Gleixner
2008-09-02 3:18 ` Linus Torvalds
2008-09-02 3:35 ` Linus Torvalds
2008-09-02 4:54 ` Larry Finger [this message]
2008-09-02 9:17 ` Alan Cox
2008-09-02 12:15 ` Thomas Gleixner
2008-09-02 15:09 ` Linus Torvalds
2008-09-02 18:14 ` Thomas Gleixner
2008-09-02 18:41 ` Alok Kataria
2008-09-02 21:16 ` Thomas Gleixner
2008-09-02 18:42 ` Linus Torvalds
2008-09-02 21:13 ` Thomas Gleixner
2008-09-02 22:21 ` Linus Torvalds
2008-09-02 23:10 ` Thomas Gleixner
2008-09-03 1:49 ` Linus Torvalds
2008-09-02 22:54 ` [PATCH] Fix TSC calibration issues Thomas Gleixner
2008-09-03 2:14 ` Linus Torvalds
2008-09-03 9:11 ` Thomas Gleixner
2008-09-04 1:14 ` Alok Kataria
2008-09-04 2:56 ` Linus Torvalds
2008-09-04 3:16 ` Arjan van de Ven
2008-09-04 3:59 ` Linus Torvalds
2008-09-04 4:10 ` Arjan van de Ven
2008-09-04 4:20 ` Linus Torvalds
2008-09-04 4:27 ` Arjan van de Ven
2008-09-04 4:25 ` Willy Tarreau
2008-09-04 4:53 ` Linus Torvalds
2008-09-04 5:09 ` Willy Tarreau
2008-09-04 1:18 ` [PATCH] Change warning message in TSC calibration Alok Kataria
2008-09-03 2:51 ` [PATCH] Fix TSC calibration issues Larry Finger
2008-09-03 4:00 ` Linus Torvalds
2008-09-03 4:34 ` Larry Finger
2008-09-05 13:45 ` Regression in 2.6.27 caused by commit bfc0f59 Mark Lord
2008-09-02 17:17 ` Bill Davidsen
2008-09-01 19:36 ` Larry Finger
2008-09-01 20:09 ` Thomas Gleixner
2008-09-01 20:23 ` Larry Finger
2008-09-01 20:45 ` Thomas Gleixner
2008-09-01 18:42 ` Linus Torvalds
2008-09-01 19:08 ` Thomas Gleixner
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