Re: serial flow control appears broken

Alan Cox
2007-07-26T16:25:23Z

> Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing enabled
> ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
>
> It's a Shuttle HOT-661 motherboard (VIA Apollo Pro Plus mainboard
> chipset). Both FreeBSD and Linux identify the serial chipset type as
> 16550A.

So you've got 16bytes of buffering. That ought to be enough on a modern
PC. The older kernels use quite limited internal buffers which may be a
factor, the current ones have a rewritten tty buffering layer which may
improve matters enormously.

Alan