ab91feabcc
OpenVPN Data Channel Offload (DCO) moves OpenVPN data plane processing
(i.e. tunneling and cryptography) into the kernel, rather than using tap
devices.
This avoids significant copying and context switching overhead between
kernel and user space and improves OpenVPN throughput.
In my test setup throughput improved from around 660Mbit/s to around
2Gbit/s.
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D34340
55 lines
2.0 KiB
Groff
55 lines
2.0 KiB
Groff
.\" Copyright (c) 2022 Rubicon Communications, LLC ("Netgate")
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd April 22, 2022
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.Dt OVPN 4
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.Os
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.Sh NAME
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.Nm ovpn
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.Nd OpenVPN DCO driver
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device ovpn"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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if_ovpn_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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device driver provides support for OpenVPN DCO.
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DCO, or Data Channel Offload, moves the OpenVPN data path into the kernel.
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This can improve performance.
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.Pp
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The
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.Nm
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interface is created automatically by the OpenVPN daemon.
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It requires no configuration other than that done by OpenVPN.
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