From: Robert Hancock <hancockr@shaw.ca>
To: Raphael Hertzog <hertzog@debian.org>
Cc: Linux Kernel ML <linux-kernel@vger.kernel.org>
Subject: Re: How to avoid serial port buffer overruns?
Date: Wed, 16 Aug 2006 08:35:05 -0600 [thread overview]
Message-ID: <44E32D19.3090405@shaw.ca> (raw)
In-Reply-To: <fa.AByCsBI8k71hMVzCyQVimrLiDU4@ifi.uio.no>
Raphael Hertzog wrote:
> (Please CC me when replying)
>
> Hello,
>
> While using Linux on low-end (semi-embedded) hardware (386 SX 40Mhz, 8Mb
> RAM), I discovered that Linux on that machine would suffer from serial
> port buffer overruns quite easily if I use a baudrate high enough (I start
> loosing bytes at >19200 bauds and I would like to make it reliable up to
> 115 kbauds). I check if overruns are happening with
> /proc/tty/driver/serial ("oe" field).
What kind of serial port are you using? If it's an unbuffered 8250-type
port, it will NEVER be reliable at higher baud rates. You want a 16550
(or better) port.
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/
next parent reply other threads:[~2006-08-16 14:35 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.AByCsBI8k71hMVzCyQVimrLiDU4@ifi.uio.no>
2006-08-16 14:35 ` Robert Hancock [this message]
2006-08-16 14:42 ` How to avoid serial port buffer overruns? Erik Mouw
2006-08-16 10:45 Raphael Hertzog
2006-08-16 14:31 ` Lennart Sorensen
2006-08-16 14:57 ` Raphael Hertzog
2006-08-16 18:44 ` Lee Revell
2006-08-16 19:23 ` Paul Fulghum
2006-08-16 21:12 ` Lee Revell
2006-08-16 22:24 ` Paul Fulghum
2006-08-16 23:10 ` Russell King
2006-08-16 23:15 ` Lee Revell
2006-08-16 23:19 ` Russell King
2006-08-16 23:28 ` Lee Revell
2006-08-17 9:20 ` Alan Cox
2006-08-17 9:28 ` Russell King
2006-08-17 11:57 ` Alan Cox
2006-08-17 13:29 ` Paul Fulghum
2006-08-17 15:48 ` Raphael Hertzog
2006-08-17 16:10 ` Raphael Hertzog
2006-08-17 16:40 ` Paul Fulghum
2006-08-18 19:31 ` Lee Revell
2006-08-23 12:45 ` Raphael Hertzog
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