.\"	$OpenBSD: kstat.1,v 1.1 2020/08/13 12:37:16 schwarze Exp $
.\"
.\" Copyright (c) 2020 Ingo Schwarze <schwarze@openbsd.org>
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.Dd $Mdocdate: August 13 2020 $
.Dt KSTAT 1
.Os
.Sh NAME
.Nm kstat
.Nd display kernel statistics
.Sh SYNOPSIS
.Nm kstat
.Op Fl w Ar wait
.Oo
.Ar name |
.Sm off
.Ar provider : instance : name : unit
.Sm on
.Oc
.Ar ...
.Sh DESCRIPTION
The
.Nm
utility displays statistics collected by the kernel.
By default, all available data is displayed.
If at least one argument is given, the display is restricted to data
that matches at least one of the arguments.
.Pp
The options are as follows:
.Bl -tag -width provider
.It Fl w Ar wait
Show statistics at intervals of
.Ar wait
seconds.
.El
.Pp
The components of arguments are as follows:
.Bl -tag -width provider
.It Ar provider
The name of the device providing the statistical data.
Pattern matching with
.Xr fnmatch 3
is supported.
.It Ar instance
An unsigned integer number.
Currently, all statistics use an instance number of 0.
.It Ar name
A string identifying the kind of data to be shown.
Pattern matching with
.Xr fnmatch 3
is supported.
.It Ar unit
An unsigned integer number, used for example if a network device has
multiple rings.
.El
.Pp
If an empty string is given for any of the components,
all values of the respective property are accepted.
.Pp
A complete list of four-component arguments supported on the current
machine can be displayed by calling
.Nm
without any argument.
.Sh FILES
.Bl -tag -width /dev/kstat
.It Pa /dev/kstat
pseudo-device providing kernel statistics
.El
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
Show receive queue statistics for all interfaces
and transmit queue statistics for all
.Xr em 4
interfaces:
.Pp
.Dl $ kstat rxq em*::txq:
.Sh SEE ALSO
.Xr netstat 1 ,
.Xr systat 1
.\" XXX .Xr kstat 4 -- add this when that page is written
.Sh HISTORY
The
.Nm
utility first appeared in
.Ox 6.8 .
.Sh AUTHORS
.An David Gwynne Aq Mt dlg@openbsd.org