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Date: Sun, 6 Feb 2005 13:53:19 -0800
From: Kris Kennaway <kris@obsecurity.org>
To: "Michael R. Hines" <mhines@cs.fsu.edu>
Message-ID: <20050206215319.GA50607@xor.obsecurity.org>
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Subject: Re: where is net.inet.udp.sendspace?
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On Sun, Feb 06, 2005 at 07:54:15AM -0500, Michael R. Hines wrote:
>=20
> On my 5.3-RELEASE system,   sysctl -a | grep net | grep space gives:
>=20
> net.local.stream.sendspace: 8192
> net.local.stream.recvspace: 8192
> net.local.dgram.recvspace: 4096
> net.inet.tcp.sendspace: 32768
> net.inet.tcp.recvspace: 65536
> net.inet.udp.recvspace: 42080
> net.inet.raw.recvspace: 8192
>=20
> Where is udp.sendspace?
>=20
> I'm having some UDP "No buffer space available" problems, but the precise=
=20
> sysctl variable corresponding to the problem doesn't seem to exist.
>=20
> Anyone else have this mysterious problem?

UDP is not buffered in the kernel like TCP is, so a sendspace sysctl
is not possible.  When the interface queue becomes full (i.e. you are
sending data to the interface at a greater rate than it can put it on
the wire), you will see this error message, and your application needs
to be able to handle it.

Kris

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