[Linux-ia64] Strange ACPI interruptions in 2.5.45 kernel

[Linux-ia64] Strange ACPI interruptions in 2.5.45 kernel

[Joel GUILLET]

Hello,

I'm working on a Lion machine (with 2 processors Itanium I) running
a 2.5.45 kernel, and I've got thousands of interruptions routed throw
ACPI.

I use PS/2 mouse and keyboard.
I've seen there were lots of problems with PS/2 on 2.5-ia64 kernels but I
didn't see anyone who had this one.

When I say "lots" of interruptions, I mean about 80 times more than the
timer ticks !!!! So, one of my processor spend almost all his time dealing
with ACPI interruptions .

Just to have a look, I've tried to disable ACPI interruptions after the
boot. ...and now, the interruptions are reported via one of the serial irq
(according to the /proc/interrupts).. if it can help.

I had no problems with this interruptions in the 2.5.44 kernel or previous
versions. I searched the code to see what had changed between the 2
kernels, but I couldn't find any interesting explanation.
BUT I already had problems since the 2.5 kernels(like a lot of people)
with my mouse or/and my keyboard (with i8042).

So if you have any idea...?

Thanks in advance.


---------
** Joel

Re: [Linux-ia64] Strange ACPI interruptions in 2.5.45 kernel

[David Mosberger]

>>>>> On Tue, 17 Dec 2002 16:21:46 +0100 (NFT), Joel GUILLET <Joel.Guillet@bull.net> said:

  Joel> I'm working on a Lion machine (with 2 processors Itanium I)
  Joel> running a 2.5.45 kernel, and I've got thousands of
  Joel> interruptions routed throw ACPI.

  Joel> I use PS/2 mouse and keyboard.  I've seen there were lots of
  Joel> problems with PS/2 on 2.5-ia64 kernels but I didn't see anyone
  Joel> who had this one.

  Joel> When I say "lots" of interruptions, I mean about 80 times more
  Joel> than the timer ticks !!!! So, one of my processor spend almost
  Joel> all his time dealing with ACPI interruptions .

  Joel> Just to have a look, I've tried to disable ACPI interruptions
  Joel> after the boot. ...and now, the interruptions are reported via
  Joel> one of the serial irq (according to the /proc/interrupts).. if
  Joel> it can help.

  Joel> I had no problems with this interruptions in the 2.5.44 kernel
  Joel> or previous versions. I searched the code to see what had
  Joel> changed between the 2 kernels, but I couldn't find any
  Joel> interesting explanation.  BUT I already had problems since the
  Joel> 2.5 kernels(like a lot of people) with my mouse or/and my
  Joel> keyboard (with i8042).

  Joel> So if you have any idea...?

That doesn't ring a bell.  I suppose you could try 2.5.50.  I don't
use the Lion's for kernel development very often myself anymore
because they're diffiult and slow to remote-reboot.  Perhaps someone
else can help.

	--david