Hi Antonio,
I'm already using batman-adv, so this bandwidth meter sounds great, I'll
try it. If I have some trouble installing batman-adv-devel (I've never
used it) or something I ask you or in the batman-adv list. Thanks!
Gabriel
El 28/05/13 04:00, Antonio Quartulli escribió:
On Mon, May 27, 2013 at 05:54:01PM -0300, Gabriel Tolón wrote:
Hi,
I want to test TP-Link WDR3500 performance using iperf. According to
TP-Link specifications, they could reach up to 600 Mbps using both 2.4
and 5 GHz bands. The problem is that as they are 100Mbps Ethernet, if I
run iperf from a PC connected to the Ethernet port, I'll be limited to
100Mbps. On the other hand, when running iperf from inside the routers,
they don't transmit more than 50 Mbps, limited by the processor.
I've read that removing some kernel modules like iptables it would be
possible to increase throughput when running iperf in routers, so I've
been trying with rmmod, but I couldn't remove iptables modules, I get
for example:
root@OpenWrt:/# rmmod ip_tables
rmmod: can't unload 'ip_tables': Resource temporarily unavailable
I guess that's because some dependencies, so I tried removing other
modules first, without success. Also I searched for a modprobe package
in opkg, but I couldn't find it.
I'd appreciate some ideas on how to achieve these measurements. Thanks!
Hello Gabriel,
I'd like to suggest you another way.
In batman-adv[0] we are currently developing an in-kernel bandwidth meter[1][2].
It is entirely implemented inside the batman-adv module and therefore it
completely runs in kernel-space.
This means that you do not have any context-switch or slow memory operations
which hurt a lot the performance on our weak routers.
It is in a "beta" stage, meaning that it has been tested on VMs and real nodes,
but only by the devs. It would be nice if you would like to give it a try :)
IPtables is not a problem in this case because the inner batman-adv traffic is
not inspected.
To use it you need to install the batman-adv-devel package because the Bandwidth
Meter is not part of any stable release yet. You can read how to install the
proper feed and the package here[3].
The commit ID you should configure in order to use the BW meter are:
batman-adv: 38a1b72b6
batctl: eebba0bfb
On [1] and [2] you will find the instructions on how to run the tool. Since it
is a testing phase, any feedback would be really appreciated!!
If you are totally new to batman-adv and mesh networking in general I'd
recommend you to read [0] and some more doc first... :-)
Cheers,
[0] http://www.open-mesh.org/projects/batman-adv/wiki/Wiki
[1] http://www.open-mesh.org/projects/batman-adv/wiki/Bandwidth_meter
[2] http://www.open-mesh.org/projects/batman-adv/wiki/Bandwidth_meter_debug
[3] http://www.open-mesh.org/projects/batman-adv/wiki/Building-with-openwrt
Gabriel
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