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From: j@bonnie.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: system hang during file transfer over serial port
Date: 11 Aug 1995 10:44:26 +0200
Organization: Private U**x site, Dresden.
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Message-ID: <40f59a$7pb@bonnie.tcd-dresden.de>
References: <9508092036.AA21965@johnwayne.src.honeywell.com>
Reply-To: joerg_wunsch@uriah.heep.sax.de
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Matt Englehart <englehar@src.honeywell.com> wrote:
>via term. I also get messages echoed to the console talking about a
>silo overflow in the kernel. I'm using a 28800 modem with 115200 the
>speed betweenn the modem and pc.
Buy a FIFO UART chip.
Turn on hardware flow control on the modem and the port.
Reduce the DTE speed of the modem to 57600 or 38400. With your
current setup, the modem is sending high-speed bursts (followed by
longer delays caused by the slower line speed), which are totally
overflowing your port. Since any retransmission is causing the same
burst overflows, your software cannot recover from this.
--
cheers, J"org private: joerg_wunsch@uriah.heep.sax.de
http://www.sax.de/~joerg/
Never trust an operating system you don't have sources for. ;-)