2006-12-28 05:09:49 +03:00
|
|
|
.\" $NetBSD: kttcp.4,v 1.3 2006/12/28 02:09:49 hubertf Exp $
|
2003-04-29 15:49:50 +04:00
|
|
|
.\"
|
|
|
|
|
.\" 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.
|
|
|
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
|
|
|
.\" must display the following acknowledgement:
|
|
|
|
|
.\" This product includes software developed by the NetBSD
|
|
|
|
|
.\" Foundation, Inc. and its contributors.
|
|
|
|
|
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
|
|
|
.\" contributors may be used to endorse or promote products derived
|
|
|
|
|
.\" from this software without specific prior written permission.
|
|
|
|
|
.\"
|
|
|
|
|
.\" 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.
|
|
|
|
|
.\"
|
2006-12-28 05:09:49 +03:00
|
|
|
.Dd December 2, 2006
|
2003-04-29 15:49:50 +04:00
|
|
|
.Dt KTTCP 4
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm kttcp
|
2006-12-28 05:09:49 +03:00
|
|
|
.Nd kernel support for testing network throughput
|
2003-04-29 15:49:50 +04:00
|
|
|
.Sh SYNOPSIS
|
2006-12-28 05:09:49 +03:00
|
|
|
.Cd "pseudo-device kttcp"
|
2003-04-29 15:49:50 +04:00
|
|
|
.Sh DESCRIPTION
|
2006-12-28 05:09:49 +03:00
|
|
|
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.
|
|
|
|
|
.Pp
|
|
|
|
|
Testing like this is useful for a few reasons:
|
|
|
|
|
.Bl -enum
|
|
|
|
|
.It
|
|
|
|
|
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.
|
|
|
|
|
.It
|
|
|
|
|
Since data received is just thrown away, the receiver
|
|
|
|
|
is very fast. This can provide better exercise for the
|
|
|
|
|
sender at the other end.
|
|
|
|
|
.It
|
|
|
|
|
Since the NetBSD 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
|
2003-04-29 15:49:50 +04:00
|
|
|
.Sh SEE ALSO
|
2006-12-28 05:09:49 +03:00
|
|
|
.Pa pkgsrc/benchmarks/kttcp ,
|
|
|
|
|
.Pa pkgsrc/benchmarks/ttcp .
|
