Max interrrupt latency

Tyson D Sawyer (
Tue, 29 Oct 1996 20:04:52 -0500 (EST)

Where can I find some good data on what to expect for maximum
interrupt latency under Linux? I am interrested in doing some
real-time projects under Linux where the hard real-time code
could be implemented as a small interrupt handler.

I found 400usec as a maximum number in a report on the Real Time Linux
home page (, but the same report also
mention that the console code may disable interrupts for as long as
a millisecond or two when doing VT switches. In my case there will
be no console so that in particular isn't a problem.