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From: root@deadline.snafu.de (Andreas S. Wetzel)
Subject: Re: tty-level buffer overflows - what to do?
To: jgreco@brasil.moneng.mei.com (Joe Greco)
Date: Thu, 4 Apr 1996 21:30:29 +0200 (MET DST)
Cc: nate@sri.MT.net, jgreco@brasil.moneng.mei.com, current@FreeBSD.org
In-Reply-To: <199604041919.NAA01863@brasil.moneng.mei.com> from Joe Greco at "Apr 4, 96 01:19:26 pm"
Organization: A world stranger than you have ever imagined.
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Hi!
---

Joe Greco writes:

] > With 2 lines going full blast (sup updates!) I see *NO* overflows on my
] > box.  Again, my box is running with about 6MB of free memory all the
] > time, so I rarely hit the disk, but I've done compiles on the machine to
] > upgrade software with no noticeable degradation of serial speed.
] > However, I do no paging at all, so my disk is mostly idle even during
] > compiles.
] 
] Run "du /" and watch your serial comms get choppy :-/

I coupled the two modems and did a "ls -Rl /" several times. Seemed ok.

] If you are running kernel mode SLIP or PPP, remember that you have several
] additional advantages over the described configuration:
] 
] 1) the code to deal with the connection can't get swapped out.
] 2) no context switch overhead..
] 3) you don't have to go through all the tty processing layers.
] 
] with only 4MB of memory, the described configuration is not likely to have
] "free memory".

The SLIP support is compiled into the kernel if that's what you mean. I never
used SLIP otherwise nor I did use user mode PPP or some ever.

Regards, mickey

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