Copyright (c) 2003 The NetBSD Foundation, Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd December 2, 2006 .Dt KTTCP 4 .Os .Sh NAME .Nm kttcp .Nd kernel support for testing network throughput .Sh SYNOPSIS .Cd "pseudo-device kttcp" .Sh DESCRIPTION This driver provides kernel support for testing network throughput from the perspective of the kernel. It is similar in spirit to the classic ttcp network benchmark program, the main difference being that with kttcp, the kernel is the source and sink of the data.
p Testing like this is useful for a few reasons: l -enum t This allows us to know what kind of performance we can expect from network applications that run in the kernel space, such as the NFS server or the NFS client. These applications don't have to move the data to/from userspace, and so benchmark programs which run in userspace don't give us an accurate model. t Since data received is just thrown away, the receiver is very fast. This can provide better exercise for the sender at the other end. t Since the .Nx kernel currently uses a run-to-completion scheduling model, kttcp provides a benchmark model where preemption of the benchmark program is not an issue. .El .Sh SEE ALSO
a pkgsrc/benchmarks/kttcp ,
Indexes created Sun Sep 21 18:09:52 GMT 2025