Ok, sleeping is a case apart, it has some limitations.
(Mingo is working on a method for sleeping down to 1ms in non-busywaiting mode)
But other syscalls work just nicely:
for example in my latencytest ( PCM audio), the
write() to /dev/dsp returns after 30-50 usecs if the audio buffer is empty, or
if after an entire fragment is freed ( you can use 1ms fragments, and it works
just nicely)
>
> How to improve this sort of depends on what you're trying to do.
Jaroslav says this is a TX FIFO limitation of the MPU401 hardware,
so the only solution is to poll the FIFO with a bigger frequency.
regard,
Benno.
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