Re: How to avoid serial port buffer overruns?

[Russell King]

On Wed, Aug 16, 2006 at 05:24:26PM -0500, Paul Fulghum wrote:
> Does the MIDI device using the standard N_TTY line discipline?
> Are you using the low_latency flag on the serial device?
> What type of UART has been tested (16550? other?)
> Are you seeing overruns or just lost data?

MIDI uses its own driver - sound/drivers/serial-u16550.c.  My guess
is there's something in the system starving interrupt servicing.
Serial is very sensitive to that, and increases in other system
latencies tends to have an adverse impact on serial.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core
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