From: Larry Finger <Larry.Finger@lwfinger.net>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Linus Torvalds <torvalds@linux-foundation.org>,
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 15:23:22 -0500 [thread overview]
Message-ID: <48BC4F3A.9020608@lwfinger.net> (raw)
In-Reply-To: <alpine.LFD.1.10.0809012208010.3243@apollo.tec.linutronix.de>
Thomas Gleixner wrote:
> On Mon, 1 Sep 2008, Larry Finger wrote:
>> The timed sleep is as accurate as I can measure.
>>
>> I put in some test prints. The value of pm2 is zero when the else branch of
>> the "if (hpet)" is entered; however, pm1 is 15768471. When we reach the
>> do_div(tsc2, tsc1) statement, tsc2 is zero, which I think means that the two
>> calls to tsc_read_refs() are returning the same junk value.
>
> Ok, so the pmtimer is probably detected later as unusable and disabled.
> Please check your logs for:
> "PM-Timer had inconsistent results:"
Booting 2.6.26, the dmesg output has a line that says:
PM-Timer running at invalid rate: 200% of normal - aborting.
Amazing that it should be exactly 200%. Why is the CPU running at half
speed when the PM-Timer rate is measured?
Larry
next prev parent reply other threads:[~2008-09-01 20:23 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
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 [this message]
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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