sio driver sucks

O. Hartmann ohartman at
Sun Nov 12 12:41:02 PST 2006

Sergey Matveychuk wrote:
> Do you know an old sio driver is hardly usable?
> There are many silo overflows, working with a terminal device is a
> nightmare. There was a report about one crash with a message about a
> spinlock holed more than 5 seconds (there is no core dump because it has
> not repeated).
> After a discussion in a Russian FIDO group I've change it on uart and
> the problems gone.
> I think a default driver should be changed from sio to uart until it
> will be fixed.

Had those overflows many times when I used FreeBSD 6.0-STABLE,
6.1-STABLE and a modem.
But this never had a so bad influence forcing me into using uart.


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