Interrupt storms when ppp is up....

Bruce Thompson (
Wed, 17 Jul 1996 05:13:29 -0600

Since somewhere around 2.0.3 or so I've been seeing some really strange
interactions between X11 and ppp.

When pppd comes up (I'm running diald to bring up my link as needed), I
see literally tens of thousands of interrupts per second if I'm in X. If I
switch to a text vc then the storm dies out and things proceed in a
reasonable manner.

The result of this is that my system almost (but not quite) hangs If X
is active at the same time as ppp.

The interrupts appear to be coming from the serial device, but I can't
for the life of me figure out how X could be affecting this. Has anyone
else seen anything like this? It's made it effectively impossible to run X
windows which is not acceptable to me. Any ideas/suggestions greatly


Bruce Thompson                  | "Rumors of our death have been greatly
Developer Technical Support     |  exaggerated."
Newton Systems Group            |      - Employees of Apple Computer, Inc.
Apple Computer, Inc.            |          | "Don't believe half of what you hear,   |  and most of what you read in the papers"            |      - Me, misquoting Lou Reed

I don't speak for Apple, my opinions are strictly my own.