Re: Bad MIDI performance : 10ms latency instead of the expected
Alan Cox (alan@lxorguk.ukuu.org.uk)
Thu, 26 Aug 1999 21:41:56 +0100 (BST)
> > if(current->need_resched())
> > schedule();
> > }
> Do you think there are some benefits by inserting the re-schedule in the
> drivers/sound/mpu401.c file ? ( less CPU usage)
>
> for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
>
> But since the FIFO is only 2 bytes long = 600usecs,
> the schedule() could cause a MIDI bandwidth decrease,
> but would keep CPU load down , right ?
> Why was the MPU401 code not tuned that way ?
Hannu tuned MPU401, Im not precisely sure how he tuned it, but it should
be sufficiently short the need_resched check isnt needed
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