Subject: Re: ring overrun
To: Brian Andresen <btandresen@ucdavis.edu>
From: Bill Studenmund <wrstuden@loki.stanford.edu>
List: port-mac68k
Date: 02/24/1997 12:50:55
> 
> On Mon, 24 Feb 1997, Bill Studenmund wrote:
> 
> > It's not good, and it's not super evil. It does mean you are losing data.
> > what else is running on your system?
> 
> Apache 1.2b6, 5 threads or streams, or whatever the appropriate term is;
> named, and all of the standard stuff (portmap, syslogd, routed, etc.,
> etc.).  The CPU itself is a IIvx.
> 
> I don't know if this has any bearing, but I noticed another message today
> that I have seen before (thought it's much less frequent) -- "fifo
> overrun" instead of "ring overrun".  Assuming that fifo is for first in,
> first out, it must be referring to a different buffer than the "ring"
> message.  Maybe a problem in one place is causing reprocussions in others.
> But maybe they're different issues entirely.

The fifo is the on-chip fifo in the serial chip.

Basically something's keeping interrupts off for too long. I'm not sure
what. We've run into this problem before, and never adequately solved it.

Take care,

Bill