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To: Steve Milliner <steve@icis.qut.edu.au>
cc: freebsd-isp@freebsd.org, freebsd-hackers@freebsd.org
Subject: Re: modem transmision problems?? 
In-reply-to: Your message of "Thu, 30 Oct 1997 13:14:40 +1000."
             <199710300314.NAA11533@russell.icis.qut.edu.au> 
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Date: Thu, 30 Oct 1997 22:01:52 +1030
From: Mike Smith <mike@smith.net.au>
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> Does anyone know (off the top of their heads) or experienced
> problems with modem transmissions as follows:
> 
> /kernel: sio3: 8 more tty-level buffer overflows

How about you start by reading the sio(4) manpage?

     sio%d: tty-level buffer overflow.  Problem in the application.  Input has
     arrived faster than the given module could process it and some has been
     lost.

Are you using user-mode ppp?  If so, it sounds like the machine is
heavily loaded and the ppp process is being starved of CPU for extended 
periods of time.

mike