RJ> An IOCTL shouldn't have any more overhead than reading or writing to a
RJ> file...
Make this a hundred cycles (and you're probably flushing some caches
somewhere). That's 0.1 us on a 1GHz CPU.
The machine I'm typing this on can do 2 milllion short thin lines per
second. That's 0.5 us per line.
If you do one ioctl per short line, you're paying 20% overhead for the
ioctl.
Juliusz
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