usleep magically reduces cpu load?

SmartList (list@cal040031.student.utwente.nl)
Sat, 3 Mar 2001 01:54:36 +0100

Why does this use up about 5% CPU (on my system) (pseude code of course)

while (data,size = get_data) {
write(/dev/dsp,data,size);
}

And this only uses about 0%:

while (data,size = get_data) {
write(/dev/dsp,data,size);
usleep(1);
}

I've also tried replacing the usleep with sched_yield() but that did
nothing.

Thomas

-- 
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/