fq_pacing Plugin

Overview

This plugin rate limits individual TCP connections on a per-remap basis.

The pacing is accomplished by using setsockopt(SO_MAX_PACING_RATE) and the Fair Queuing (see man 8 tc-fq) qdisc.

Supported Platforms

• Linux
• RedHat/Centos 7.2+
• Debian 8x
• Any Linux kernel >= 3.18

Configuration Instructions (Linux)

1. Before activating this plugin, you must enable the fair queuing qdisc by setting net.core.default_qdisc = fq in /etc/sysctl.conf` and rebooting.
2. Confirm the qdisc is active by running sysctl net.core.default_qdisc
3. Specify the plugin name and rate (bytes per second) on a remap line in remap.config to activate:

map http://reverse-fqdn/ http://origin/ @plugin=fq_pacing.so @pparam=--rate=100000