On 29 May 1999, Chris G. Demetriou wrote:
> Richard Earnshaw <rearnsha@arm.com> writes:
> > few lines.  The only info I have is that shortly prior to crashing, systat 
> > is showing around 32k parallel port interrupts in the preceding 5 second 
> > interval, which seems pretty high;  my best guess is that there is some 
> > race condition when the printer is sucking data out as fast as it can be 
> > sent.
> 
> I'd expect it to be sucking data out and interrupting pretty quickly,
> of course.  One thing you might try is changing the DELAY(1)'s around
> line 392 of dev/ic/lpt.c to something slightly more than one.  It
> might be interesting to kow what value delays make it work, if any...

This might be a CPU-specific problem, since I have an ink-jet printer
hooked to a Shark which causes ~32k ints/second too without problem. This
same Shark fields lpt/serial (115kbps modem)/net/disk interrupts
simultaneously sans problem.

Cheers, Steve