serial performance

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If I start dosemu -s with this:

> $_ports = "fast range 0x3F8,0x3FF"
> $_irqpassing = "4"

A speed of 57600 looks fast, like it should be.  But if I omit the
direct hardware access, and try this:

> $_com1 = "/dev/ttyS0 irq 4"

57600 still works, but looks much slower on the remote side of a null
modem cable.  Seems like I read where the code traps serial port writes
and buffers data to /dev/ttyS0.  Is the trapping causing the slowdown?
Is there a cure?

I don't want to use direct hardware access.  I tested it that way, only
to see how things work.

I'm using the latest dosemu svn code.  I first tried a 2.6.32 kernel on
arch linux, but got a kernel panic, then tried a suse 2.6.11 kernel, and
got these results.  Both were i386 only, never x86_64.

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