I use an external serial modem (USR Courier, if it matters) connected to 
a PCI serial port.  My host is Linux 64-bit Ubuntu, guest is Windows XP 
32-bit.

Sometimes my communications software works great - other times it has 
problems talking to the modem.  It seems like sometimes there's a 
variation in the speed - either the speed of the overall guest or the 
speed of communication to the serial port.

I don't see anything obvious in the logs - any suggestions?  What I 
really want is a way to ensure close to real-time communication with the 
serial port so my software doesn't time-out (and we're talking about 
supporting a whopping 300 baud communicator here!)
-- 
Daniel

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