Re: How to avoid serial port buffer overruns?

From: Lee Revell
Date: Wed Aug 16 2006 - 19:11:54 EST

On Thu, 2006-08-17 at 00:10 +0100, Russell King wrote:
> 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.


Have you seen many other reports of serial working reliably in 2.4 but
not in 2.6? Right now this is the only clue I have to go on...


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