From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu,  2 Feb 2006 12:44:36 +1000
From: George Michaelson <ggm@apnic.net>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] Van Jacobsen's network stack restructure
Message-ID: <20060202124436.0fc28aa3@garlic.apnic.net>
In-Reply-To: <1138845678.20908.41.camel@heater.intranet.ebr>
References: <20060202012733.5D8D11E8C24@holo.morphisms.net>
	<1138845678.20908.41.camel@heater.intranet.ebr>
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$ sysctl net.inet.ip|wc -l
      23
$ sysctl net.inet.tcp|wc -l
      28
$ sysctl net.inet.udp|wc -l
       4
$ sysctl net.inet.arp|wc -l
       4
$ uname -a
NetBSD garlic.apnic.net 3.99.15 NetBSD 3.99.15 (GGMSMALL-NOV6) #0: Tue Jan 24 09:14:58 EST 2006  root@:/data/Build/src/sys/arch/i386/compile/GGMSMALL-NOV6 i386
$

So thats 23 knobs in the kernel for ip, another 28 for tcp, 4 for udp,
and 4 for arp.

Since udp does no backoff or e2e flow control, its hardly surprising it
doesn't have much tuning.

Since tcp does, its also hardly surprising it has at least *some*
options

To be fair, at least some of the knobs will come from IETF driven
tweaks. if 9 doesn't let you frob with them, that doesn't have to be
good. (moving from cable to wifi and VPN I sometimes want to at least
alter my MTU and frag behaviour. pMTU is broken for a lot of places and
tunnelling hurts with fragments)

-G