Re: interrupt latency ?

From: Jörn Engel (
Date: Tue Feb 11 2003 - 06:59:07 EST

On Mon, 10 February 2003 13:30:49 -0500, Richard B. Johnson wrote:
> On Mon, 10 Feb 2003, [iso-8859-1] J?rn Engel wrote:
> > An assembler interrupt handler that saves registers, tweaks a couple
> > of bits, restores registers and gets the hell out of here should be in
> > the order of 100 cycles, maybe less. Why is linux wasting all this
> > time?
> FYI execution speed and interrupt latency doesn't scale well. You
> are most always I/O bound somewhere.

Ack. It always takes a moment to get used to these facts.


Beware of bugs in the above code; I have only proved it correct, but
not tried it.
-- Donald Knuth
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