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SubjectRe: Mouse interrupts: the death knell of a VP6
On Wed, 10 Apr 2002, Oleg Drokin wrote:

> Hello!
>
> On Wed, Apr 10, 2002 at 09:02:05AM -0500, Brent Cook wrote:
>
> > I have an ABIT VP6 motherboard, using the VIA Apollo chipset and 2 700Mhz
> > PIII's, but please don't hold that against me. The system is running
> > 2.4.19-pre6. I believe that I either have a system that has trouble
> > handling a sudden bursts of interrupts, or have found a fault in mouse
> > handling.
>
> Have you tried to change MPS mode to 1.1 from 1.4 (I see addres message timeouts
> in your log)?

No, I had not. I will though, and will report if this causes some change.
Everything looks fine for the first five minutes though.

> > I have already tried removing memory, adding memory, changing processors,
> > video cards. The only thing that has remained constant is the VP6
> > motherboard and the hard drive.
>
> My VP6 died on me recently with some funny symptoms:
> it hangs in X when I start netscape and move mouse, or if I do
> bk clone on kernel tree, it dies with
> kernel BUG at /usr/src/linux-2.4.18/include/asm/smplock.h:62!

Very interesting. I could do the same thing, and have a similar lock with
a PS/2 mouse. I will start looking in smplock.h if the MPS change does not
help.

> BUG in various places pretty soon.
> (this BUG is only appears if 2 CPUs are present in motherboard).
> So if your troubles began only recently, you might want to try another
> motherboard just to be sure.

I received the motherboard used, so I do not know if this is a recent
development. I have tried several other kernels which all show the same
locking behavior with PS/2 mice (2.4.17, 2.4.18, 2.5.7-dj3.) The previous
owner ran Windows XP (developer preview) on the board, and it had a
tendency to lock often, especially under high IO. I attributed this to
software issues, though now I wonder why the previous owner _really_ gave
it to me!

I have used a Tyan Tiger 100 with two processors and an Intel BX chipset,
with great success and no similar locks, so I am 50% certain that a
hardware difference is the root cause of the problem. Hopefully, someone
else will have seen similar problems.

> Bye,
> Oleg
>

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