linux-kernel - Re: TSC marked unstable on suspend and resume

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Message-ID: <20090227210536.GA1476@ucw.cz>
Date:	Fri, 27 Feb 2009 22:05:37 +0100
From:	Pavel Machek <pavel@....cz>
To:	David Fries <david@...es.net>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: TSC marked unstable on suspend and resume

On Mon 2009-02-23 22:58:03, David Fries wrote:
> On Tue, Feb 24, 2009 at 12:23:51AM +0100, Rafael J. Wysocki wrote:
> > On Saturday 21 February 2009, David Fries wrote:
> > > I'm getting TSC marked as unsable on hibernate to disk with
> > > 2.6.29-rc3.  The last kernel I ran 2.6.24.4 ran 300+ days without a
> > > problem and does not loose TSC on hibernate.
> > 
> > Ingo, Andrew, can you please tell us who's the right person to look into this
> > problem?
> 
> I'll be looking into it, I haven't yet started debugging it.  If
> anyone has a theory of operation or what I should be lookking for, I'm
> all ears.  This is an old AMD K6-2 300MHz system.  I don't know if it
> matters or not, but I have NO_HZ enabled, but the timer is still going
> off at 1000 Hz.
> 
> I have to decide if it is worth it to split my swap partition in two
> so I can hibernate both my working kernel, and the test kernel.  It
> would be nice to test a kernel and pick up where I left off.  I expect
> rootfstype=ext2 on the test kernel and it really will keep my
> filesystem read only.

Be very careful there... if you accidentally mount rw or have shared
writable partition between production and test environment, you'll
have problems... 

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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