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Date: Tue, 13 Nov 2007 17:07:21 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: Mark Lord <liml@rtr.ca>
cc: Andrew Morton <akpm@linux-foundation.org>,
       Natalie Protasevich <protasnb@gmail.com>, linux-kernel@vger.kernel.org,
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Subject: Re: [BUG] New Kernel Bugs
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On Tue, 13 Nov 2007, Mark Lord wrote:

> Andrew Morton wrote:
> > On Mon, 12 Nov 2007 22:42:32 -0800 "Natalie Protasevich"
> > <protasnb@gmail.com> wrote:
> ..
> > > with CONFIG_NO_HZ and/or CONFIG_HPET_TIMER set kernel 2.6.23 doesn't
> > > boot (ARM, Timer)
> > > http://bugzilla.kernel.org/show_bug.cgi?id=9229
> > > Kernel: 2.6.23
> > 
> > No response from developers
> ..

The bug report is bogus. ARM has no CONFIG_HPET_TIMER. 
 
> Note:  that same bug exists/existed on i386 back when NO_HZ was
> introduced (2.6.21?).  I still see it from time to time on my Quad core
> system (very rare), but not any more on my Duo notebook where it used
> to happen about 1 in n boots (n < 10).
> 
> AFAICT no fix was ever released for it.

Hmm, at which point does the boot stop ? 

> > > Suspend to RAM resume hangs on a tickless (NO_HZ) kernel
> > > http://bugzilla.kernel.org/show_bug.cgi?id=9275
> > > Kernel: 2.6.23
> > > This is HP notebook nc6320 T2400 945GM
> > No response from developers
> ..
> 
> I *still* get very slow resume-from-RAM quite often here
> (new in 2.6.22 kernel, wasn't there in early 2.6.23-rc*).

Hmm. Which one 22 or 23 ?

> Something eventually times out after a minute or so
> and it comes back.  Cannot make it happen reliably,
> unless I'm in a hurry to get something done.  :)
> I suspect USB here, probably the same loopy bug that
> we added a "loop limit failsafe" for back in 2.6.21(?).

Do you have a pointer to that please ?

Thanks,

	tglx