Date: Sun, 6 Feb 2005 13:53:19 -0800 From: Kris Kennaway <kris@obsecurity.org> To: "Michael R. Hines" <mhines@cs.fsu.edu> Cc: freebsd-questions@freebsd.org Subject: Re: where is net.inet.udp.sendspace? Message-ID: <20050206215319.GA50607@xor.obsecurity.org> In-Reply-To: <6.2.0.14.2.20050206075404.033686e8@garnet.acns.fsu.edu> References: <6.2.0.14.2.20050206075404.033686e8@garnet.acns.fsu.edu>
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[-- Attachment #1 --] On Sun, Feb 06, 2005 at 07:54:15AM -0500, Michael R. Hines wrote: > > On my 5.3-RELEASE system, sysctl -a | grep net | grep space gives: > > 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 > > Where is udp.sendspace? > > I'm having some UDP "No buffer space available" problems, but the precise > sysctl variable corresponding to the problem doesn't seem to exist. > > 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 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (FreeBSD) iD8DBQFCBpHOWry0BWjoQKURAvGoAJ97IX3JRBfPHRpTxgzuvE1bU/9zRgCg2TKL GKNMJiar+MIz6y+6Ti6iOdU= =BQ3a -----END PGP SIGNATURE-----
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