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Subject: Re: 2.4.18 serial drops characters with 16654
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andreas Steinmetz <ast@domdv.de>
Cc: Ed Vance <EdV@macrolink.com>,
       "'dchristian@mail.arc.nasa.gov'" <dchristian@mail.arc.nasa.gov>,
       linux-kernel@vger.kernel.org
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Date: 12 Sep 2002 09:20:55 +0100
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On Thu, 2002-09-12 at 00:12, Andreas Steinmetz wrote:
> I did see something that looks quite similarl like dropped characters on 
> Redhat and 2.4.9 based UP systems (that's customers choice and couldn't 
> be changed) equipped with a NS-87336.
> I can't go into detail but my company did port an application from DOS 
> to Linux. The application communicates with an electronic cash device 

Other than the usual PIO mode IDE suspects I've had no problems going up
to 460800bps with a decent UART (ie one with a fifo). At 920Kbit/sec you
begin to overrun the flip buffers if you run with the usual 100Mhz timer
tick.

2.4 is a bit worse nowdays because of the ksoftirqd stuff but you could
easily disable that if you think it is triggering.

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