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If you run high baud-rates on your modem, the computer might be to slow
to handle all those interrupts from the serial interface and drop some
characters, which it calls a 'silo overflow'. To prevent this, try one
of the following two solutions:
- Try setting bigger buffers for serial i/o. Put the following in
your kernel config file an recompile:
options "SERIBUF_SIZE=4096"
options "SEROBUF_SIZE=32"
- If this doesn't work, you can try to play with the interrupt
system, lowering the clock-interrupts from level 6 to level 4, which
will no longer block the serial receive interrupts at level 5.
To do so, uncomment the following line from your kernel config file and
recompile:
options LEV6_DEFER # defers l6 to l4 (below serial l5)
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