linux-kernel - Re: serial flow control appears broken

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Message-ID: <20070726173121.70088a92@the-village.bc.nu>
Date:	Thu, 26 Jul 2007 17:31:21 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Lee Howard <faxguy@...ardsilvan.com>
Cc:	Robert Hancock <hancockr@...w.ca>, linux-serial@...r.kernel.org,
	tytso@....edu, rmk@....linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: serial flow control appears broken

> 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
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