Subject: Re: silo overflows, was fifo overruns
To: James Graham - Systems Mangler <email@example.com>
From: Jukka Marin <firstname.lastname@example.org>
Date: 11/13/1997 07:41:06
On Wed, Nov 12, 1997 at 07:28:17PM -0800, James Graham - Systems Mangler wrote:
> * > >So something's blocking interrupts for too long.
> * > >
> * > Is there a way to profile this, or log interrupts to see what it might be?
> * Maybe one could write the interrupt level into a parallel port every time
> * the system enters an interrupt routine and then monitor the parallel port
> * pins to see what is going on.. (An oscilloscope or logic analyzer
> * required.)
> Great idea.
> Problem: Sun4c has no parallel port.
I know that all too well. Someone just suggested that the interrupt latency
problem affects all ports (which I think is true) and many platforms _do_
have parallel ports..
I guess you could also set the serial port to the maximum speed and write
information (single bytes) to it at the beginning and end of interrupt