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Message-Id: <200806201422.12659.rjw@sisk.pl>
Date: Fri, 20 Jun 2008 14:22:11 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Matthew Garrett <mjg59@...f.ucam.org>
Cc: "Maciej W. Rozycki" <macro@...ux-mips.org>,
Ingo Molnar <mingo@...e.hu>,
Stephen Rothwell <sfr@...b.auug.org.au>,
linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Len Brown <lenb@...nel.org>
Subject: Re: linux-next: Tree for June 13: IO APIC breakage on HP nx6325
On Friday, 20 of June 2008, Matthew Garrett wrote:
> On Fri, Jun 20, 2008 at 01:53:58PM +0200, Rafael J. Wysocki wrote:
>
> > What exactly I observe is that in this case:
> > 1) The cooling fan is 100% on, as though the box were overheating, which seems
> > to indicate some serious confusion of the platform (the mechanism turning
> > the fan 100% on is supposed to be transparent to software).
> > 2) Everything seems to slow down substantially, at least as soon as X is
> > started.
>
> What does ACPI claim the trip points are set to in this case? On the
> 6125, if IRQ 2 is enabled in the APIC then the DSDT sets all the thermal
> trip points to 16 degrees C. I suspect this means that enabling IRQ 2 is
> the wrong thing to do on this chipset.
Ah, indeed, thanks for the hint. This is the output of
$ cat /proc/acpi/thermal_zone/TZ*/trip_points
in the failing case:
critical (S5): 105 C
passive: 16 C: tc1=1 tc2=2 tsp=100 devices=C000 C001
active[0]: 16 C: devices=C34F
active[1]: 16 C: devices=C350
active[2]: 16 C: devices=C351
active[3]: 16 C: devices=C352
critical (S5): 100 C
passive: 16 C: tc1=1 tc2=2 tsp=300 devices=C000 C001
critical (S5): 100 C
passive: 16 C: tc1=1 tc2=2 tsp=300 devices=C000 C001
(also available at: http://www.sisk.pl/kernel/debug/20080620/trip-points.txt).
So, the observed slowdown may be a result of throttling.
Thanks,
Rafael
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