On Thu, Jun 15, 2006 at 06:10:45PM +0200, Pavel Cahyna wrote:
> I have a 486 with a FIFO-less serial port which was actually used as a
> router with a modem. I'll try to benchmark the impact of your changes on it.

Naively, that might seem like a good test.  However, the original goal
of my com(4) rewrite a decade ago was to support *multiple* modems --
sometimes multiple 4- or 6-port cards -- simultaneously, because people
were building massive dialup servers running on cheap PCs.  This may
not be an issue any more, but this and several other changes in recent
years have almost certainly slowed things down enough that those
machines would not work any more.