netdev - Re: [PATCH diagnostic] Re: HPET regression in 2.6.26 versus 2.6.25 -- RCU problem

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Message-ID: <20080811192740.GM6762@linux.vnet.ibm.com>
Date:	Mon, 11 Aug 2008 12:27:40 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	David Witbrodt <dawitbro@...global.net>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH diagnostic] Re: HPET regression in 2.6.26 versus 2.6.25
	-- RCU problem

On Mon, Aug 11, 2008 at 11:22:21AM -0700, David Witbrodt wrote:
> 
> 
> > > Well, I was hoping to see something interesting.  I ran it with parameters
> > > "debug initcall_debug", and it locked up at the same place.  I let it for
> > > 15 minutes, in case of some delayed reaction.  Nada.
> > 
> > Interesting.  The causes could be:
> > 
> > o    Scheduling-clock interrupts aren't happening, as Ingo suggested.
> 
> Does anyone have a short answer to this question:  Were the changes between
> 2.6.25 and 2.6.26 so major that interrupts are NOW being used that were not
> being used before?

Not that I am aware of, but I must defer to others who know more about
Linux's timer interrupts than do I.

							Thanx, Paul

> Again, I don't even pretend to understand the kernel's inner workings, but
> 2.6.25 _did_ work on this hardware... and with HPET enabled.
> 
> 
> DW
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