Re: How to avoid serial port buffer overruns?

From: Lee Revell
Date: Wed Aug 16 2006 - 17:09:10 EST

On Wed, 2006-08-16 at 14:23 -0500, Paul Fulghum wrote:
> Lee Revell wrote:
> > On Wed, 2006-08-16 at 12:45 +0200, Raphael Hertzog wrote:
> >>Now I switched to stock 2.6 and while the stock kernel improved in
> >>responsiveness, it still isn't enough by default (even with
> >>CONFIG_PREEMPT=y and CONFIG_HZ=1000). So I wanted to try the "rt" patch of
> >>Ingo Molnar and Thomas Gleixner, but the patched kernel doesn't boot (see
> >>bug report in a separate mail on this list).
> >
> >
> > Does the serial performance seem to have regressed from 2.4 to 2.6? I
> > am chasing a similar issue with a serial MIDI card (supported by the bog
> > standard 8250 serial driver) that drops notes under 2.6 but works with
> > 2.4. I don't have details yet, but it sounds like a similar problem.
> What specific 2.6 kernels are each of you using?

2.6.15 and 2.6.16. Here is the .config:

I don't know which 2.4 version they tested on that worked - just that
the problem started when moving to 2.6.


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