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Date: Sat, 5 Oct 2002 17:07:15 +0200
From: bert hubert <ahu@ds9a.nl>
To: jbradford@dial.pipex.com
Cc: linux-kernel@vger.kernel.org, rmk@arm.linux.org.uk
Subject: Re: 2.5.x and 8250 UART problems
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On Sat, Oct 05, 2002 at 04:06:45PM +0100, jbradford@dial.pipex.com wrote:

> I've noticed that 8250 UART based serial port performance is poorer in
> 2.5.x than 2.4.x and 2.2.x, on a couple of my machines.
> 
> The 486 SX-20 with 4 MB RAM, running 2.2.21 reliably achieves about 650
> BPS download from another machine, with the port runnnig at 9600 bps. 
> With 2.5.40, many characters are lost at 9600, making, e.g. a ZModem
> transfer retry for almost every block.

Have you tried 'hdparm -u'?
> 

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