linux-kernel - Re: [BUG] jiffies counter leaps in 2.6.24-rc3

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Message-ID: <20071129082029.22d6448a@morte>
Date:	Thu, 29 Nov 2007 08:20:29 +0100
From:	Stefano Brivio <stefano.brivio@...imi.it>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Michael Buesch <mb@...sch.de>
Subject: Re: [BUG] jiffies counter leaps in 2.6.24-rc3

On Sat, 24 Nov 2007 20:31:25 +0100
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> On Saturday, 24 of November 2007, Stefano Brivio wrote:
> > On Sat, 24 Nov 2007 19:48:58 +0100
> > "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> > 
> > > NO_HZ?  Highres timers?
> > 
> > CONFIG_HZ_1000=y
> > # CONFIG_HIGH_RES_TIMERS is not set
> >  
> > > I understand that the previous kernels behave correctly.  All of them?
> > 
> > 2.6.21 behaved correctly. Sorry but git-bisect would take a lot of time
> > (I can't reliably reproduce the jiffies jump), so I would avoid that if
> > not strictly needed.
> 
> Well, it would be good to know if 2.6.23 behaves correctly, at least.

Weird, it looks like I can't boot with 2.6.23.9 because of some issues with
dm-crypt (my root filesystem is encrypted). I double-checked the
configuration (which I just took from my current one), well, no way. Any
other test I can do?

In the meanwhile, I noted another thing: sometimes it happens that I become
root and the jiffies counter jumps ahead. Then, when I close any root
session, the jiffies counter jumps back to the correct value.

Please remember that this isn't just an aesthetic issue, as some drivers
(e.g. b43 and b43legacy, but I guess a lot more) rely on jiffies. Do I need
to file a bug to bugzilla.kernel.org? Thank you.

--
Ciao
Stefano
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