[SOLVED] Netem rate limiting (token bucket filter) not supported?

[PilotJLR]

Hello,
I've been trying for a couple days now to get netem rate limiting to work on a Fedora 12 i686 virtual machine (both on VMware Fusion and KVM), and have had no success.

In order to do outbound rate limiting, I want to use the netem token bucket filter (TBF), as described here:
http://www.linuxfoundation.org/colla...m#Rate_control

Unfortunately, attempting to use the TBF results in this error:

[root@f12-build ~]# tc qdisc add dev eth1 parent 1:1 handle 10: tbf rate 256kbit buffer 1600 limit 3000
RTNETLINK answers: Operation not supported

However... the exact same command DOES work on a default net install of Debian 5.0.4.

I've already recompiled the Fedora kernel with TBF (and all QoS options, actually) loaded by default. I've also verified the right modules are present:

[root@f12-build ~]# lsmod | grep sch
sch_tbf                 3187  0 
sch_netem               5670  1

Yet I still have not figured out how to resolve this... rate limiting is clearly an option, since a basic vanilla Debian install supports it.

If anyone has rate limiting / TBF working on Fedora, or if anyone has any suggestions, I would really appreciate it!

Thank you

[PilotJLR]

Solved!

A post on ubuntuforums taught me that netem doesn't allow child layers to be added to it, so the TBF rate limiting must be set before latency.

What DOES work:

[root@f12-build ~]# tc qdisc add dev eth1 root handle 1: tbf rate 256kbit buffer 1600 limit 3000
[root@f12-build ~]# tc qdisc add dev eth1 parent 1: handle 10: netem delay 150ms

Credit goes here:
http://ubuntuforums.org/showpost.php...28&postcount=3