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Date:      Fri, 22 Dec 1995 11:49:49 -0500
From:      "Garrett A. Wollman" <wollman@lcs.mit.edu>
To:        R Bezuidenhout <rbezuide@mikom.csir.co.za>
Cc:        bugs@freebsd.org
Subject:   Possible TCP/UDP routing kernel bug?
Message-ID:  <9512221649.AA01167@halloran-eldar.lcs.mit.edu>
In-Reply-To: <199512221107.NAA27283@zibbi.mikom.csir.co.za>
References:  <199512221107.NAA27283@zibbi.mikom.csir.co.za>

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<<On Fri, 22 Dec 1995 13:07:52 +0200 (SAT), R Bezuidenhout <rbezuide@mikom.csir.co.za> said:

> Router2 starts to degrade, almost immediately in such a fashion
> that even pressing ENTER on a console (all machines are running in 
> console mode) does not return a prompt.

> I can't even get a load average, but I know it is more or less 1.5

When the experiment is completed, use sysctl(8) to examine
net.inet.ip.intr-queue-drops to see how many packets were dropped due
to overload.

> I have tried using different motherboards (all machines are 486DX2-66
> with 8 meg ram and 16 meg swap).  There doesn't seem to be any hardware
> defects.

You have slow machines and slow network cards.

> As far as I know FreeBSD should be able to and have previously
> handled the load??

I don't know.  I have a machine here which is capable of forwarding
17,000 64-byte packets per second, but it's a 100-MHz Pentium with
three DE500s in it.

-GAWollman

--
Garrett A. Wollman   | Shashish is simple, it's discreet, it's brief. ... 
wollman@lcs.mit.edu  | Shashish is the bonding of hearts in spite of distance.
Opinions not those of| It is a bond more powerful than absence.  We like people
MIT, LCS, ANA, or NSA| who like Shashish.  - Claude McKenzie + Florent Vollant



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