Re: PATCH - acpica-20031203

On Tue, 9 Dec 2003, Andy Fawcett wrote:
> On Monday 08 December 2003 19:47, Nate Lawson wrote:
> > I've built and run the latest ACPI-CA dist and it looks pretty good.
> > It has a lot of fixes from FreeBSD as well as Linux.  Please give it
> > a try and let me know if it gives you any new problems.
> >
> >     http://www.root.org/~nate/freebsd/acpica-20031203.diff.gz

The about patch has been committed, along with some other related changes.
Please cvsup to today and test again.

> I've just installed 5.2-CURRENT (post -BETA branching) to my Asus P2B-DS
> based system, and I am seeing slow performance. Looking at the output
> of "ps -axu" I can see massive amounts of Interrupt activity (removed
> VSZ and RSS fields to save space):
>
> USER    PID %CPU %MEM   TT  STAT STARTED      TIME COMMAND
> root     30 95.3  0.0   ??  RL    1:08PM   4:11.77  (irq20: acpi0)
> root     12 53.9  0.0   ??  RL    1:08PM   5:08.86  (idle: cpu0)
> root     11 50.0  0.0   ??  RL    1:08PM   4:28.89  (idle: cpu1)
>
> # uname -a
> FreeBSD nobby.int.athame.co.uk 5.2-CURRENT FreeBSD 5.2-CURRENT #2: Mon
> Dec  8 21:32:07 EET 2003     root_at_nobby.int.athame.co.uk:/usr/obj/usr/
> src/sys/NOBBY  i386
>
> This happens both before and after installing the 20031203 patchset.

Since you have this problem after applying the patch, cvsuping probably
won't help.

> The box was previously running 5.1R with no apparent problems.
>
> From dmesg:
> acpi0: Overriding SCI Interrupt from IRQ 9 to IRQ 20
>
> I've read through as much of the -current archives as possible, but I
> can't see anything that helps me diagnose the problem.

The issue is likely that you have a broken BIOS.  Before 5.2, we didn't
use the APIC on non-SMP boxes.  Now we use it if it's available.  Try this
in loader.conf to disable APIC irq routing:

  hint.apic.0.disabled=1

If that doesn't work, you might have luck commenting out the override code
that generates the printf you show above.

-Nate