From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philippe Gerum <rpm@xenomai.org>
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Date: Sat, 13 Oct 2007 18:35:21 +0200
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Sender: Philippe Gerum <philippe.gerum@domain.hid>
Subject: Re: [Xenomai-core] [PATCH] fix hw-timer setup/cleanup for i386
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To: Stelian Pop <stelian@domain.hid>
Cc: Jan Kiszka <jan.kiszka@domain.hid>, Xenomai-core@domain.hid

On Sat, 2007-10-13 at 18:12 +0200, Stelian Pop wrote:
> On Sat, Oct 13, 2007 at 04:42:27PM +0200, Jan Kiszka wrote:
> 
> > Where do you get ENODEV? On nucleus startup? Please provide
> > /proc/timer_list output of the working and non-working setups.
> 
> It turns out that I had the Linux NMI watchdog enabled (nmi_watchdog=1
> on the command line) and this was causing the -ENODEV problems. Once
> removed, I'm able to boot and successfully run all configurations: UP,
> UP + APIC, UP + APIC + IO_APIC, SMP. And the latencies are back to normal.
> 

The clock event layer turns off the APIC timer when the NMI watchdog is
set to use the IO-APIC. Unfortunately, using nmi_watchdog=2 may just not
work at all on broken hardware with recent kernels (like the one I have
just in front of me...).

> Maybe we should detect that the NMI watchdog is enabled and issue a
> warning message, this would save others a few hours and many kernel
> builds...

There is work in progress on the NMI issue, but this message will likely
appear until we've fixed this properly.

> 
> This is with your timer cleanup patch, of course.
> 
> > PS: For unknown reasons your mails don't make it to my web.de address,
> > only to the list. Do you get any error messages?
> 
> I did get one saying:
> 	<jan.kiszka@domain.hid>: host mx-ha02.web.de[217.72.192.188] refused to talk to me:
> 	554 Transaction failed. For explanation visit
> 	http://freemail.web.de/reject/?ip=88.191.70.230
> 
> I didn't investigate yet what's happenning.
> 
-- 
Philippe.