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From: Thomas Gleixner <tglx@linutronix.de>
To: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Cc: Andrew Paprocki <andrew@ishiboo.com>,
	linux-kernel@vger.kernel.org, Balaji Rao <balajirrao@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@elte.hu>,
	clemens@ladisch.de, venkatesh.pallipadi@intel.com,
	bob.picco@hp.com
Subject: Re: HPET timer broken using 2.6.23.13 / nanosleep() hangs
Date: Wed, 16 Jan 2008 15:28:54 +0100 (CET)	[thread overview]
Message-ID: <alpine.LFD.0.99999.0801161524250.3764@localhost.localdomain> (raw)
In-Reply-To: <alpine.LFD.0.99999.0801161458470.3764@localhost.localdomain>

On Wed, 16 Jan 2008, Thomas Gleixner wrote:

> On Sun, 13 Jan 2008, Dhaval Giani wrote:
> > On Sun, Jan 13, 2008 at 08:10:46AM -0500, Andrew Paprocki wrote:
> > > I applied the patch to my 2.6.23.13 tree and upon reboot it stopped right after:
> > > 
> > > Clocksource tsc unstable (delta = ... ns)
> > > Time: hpet clocksource has been installed.
> > > 
> > > It locked up hard.. cursor stopped blinking and SysRq isn't working either.
> 
> The hint is in the original report:
> 
> Clocksource tsc unstable (delta = 500013666 ns)
> 
> That means, that the TSC was counting, but HPET not. So it looks like
> the HPET readout is stale. Which explains, why after switching to HPET
> clocksource the time system gets hosed.
> 
> I wonder why the HPET counter works check did not catch this.
> 
> Can you please apply the path below and provide the output ?

Oh. Stupid me. This is 2.6.23. So the patch won't apply.

Andrew, can you please check, whether 2.6.24-rc8 works on your machine ?

I look into a backport fix for 2.6.23 later.

Thanks,
	tglx



  reply	other threads:[~2008-01-16 14:32 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-13 11:10 Andrew Paprocki
2008-01-13 12:03 ` Dhaval Giani
2008-01-13 13:10   ` Andrew Paprocki
2008-01-13 14:06     ` Dhaval Giani
2008-01-16 14:15       ` Thomas Gleixner
2008-01-16 14:28         ` Thomas Gleixner [this message]
2008-01-16 15:21           ` Thomas Gleixner
2008-01-16 19:39             ` Andrew Paprocki
2008-01-18 10:26               ` Thomas Gleixner
2008-02-09 23:27                 ` Andrew Paprocki
2008-01-14 12:59 ` Clemens Ladisch
2008-01-14 14:12   ` Balaji Rao

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