> 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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