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Fill manpage with some data, taken from comments in the kernel source

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hubertf 2006-12-28 02:09:49 +00:00
parent a23a6ee6c6
commit f300aecb2d
2 changed files with 34 additions and 34 deletions
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38
share/man/man4/kttcp.4
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@ -1,4 +1,4 @@
.\" $NetBSD: kttcp.4,v 1.2 2003/07/26 20:17:32 salo Exp $
.\" $NetBSD: kttcp.4,v 1.3 2006/12/28 02:09:49 hubertf Exp $
.\"
.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -31,17 +31,39 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd April 29, 2003
.Dd December 2, 2006
.Dt KTTCP 4
.Os
.Sh NAME
.Nm kttcp
.Nd unknown
.Nd kernel support for testing network throughput
.Sh SYNOPSIS
.Cd "unknown"
.Cd "pseudo-device kttcp"
.Sh DESCRIPTION
No 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.
.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
.Sh SEE ALSO
Nothing
.Sh BUGS
thorpej@NetBSD.org has not yet written this man page.
.Pa pkgsrc/benchmarks/kttcp ,
.Pa pkgsrc/benchmarks/ttcp .

30
sys/dev/kttcp.c
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@ -1,4 +1,4 @@
/* $NetBSD: kttcp.c,v 1.21 2006/11/16 01:32:45 christos Exp $ */
/* $NetBSD: kttcp.c,v 1.22 2006/12/28 02:09:49 hubertf Exp $ */
/*
* Copyright (c) 2002 Wasabi Systems, Inc.
@ -37,34 +37,12 @@
*/
/*
* kttcp.c --
*
* This module 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.
*
* Testing like this is useful for a few reasons:
*
* 1. 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.
*
* 2. Since data received is just thrown away, the receiver
* is very fast. This can provide better exercise for the
* sender at the other end.
*
* 3. 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.
* kttcp.c -- provides kernel support for testing network testing,
* see kttcp(4)
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kttcp.c,v 1.21 2006/11/16 01:32:45 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: kttcp.c,v 1.22 2006/12/28 02:09:49 hubertf Exp $");
#include <sys/param.h>
#include <sys/types.h>