usleep magically reduces cpu load?

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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

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