RV220W Enabling WMM reduces WiFi throughput significantly

[Jens Janssen]

Hi,

according to

http://www.smallnetbuilder.com/wireless/wireless-features/30938-dont-mess-with-wmm enabling WMM should increase wireless performance.

Although this article is rather old, how is the RV220W expected to behave?

In my case, speed measurements show a clear decrease in wireless performance when WMM is enabled.

For example:

WMM enabled - max 15MBits/s (ticked WMM checkbox - default settings)

WMM disabled - max 40MBits/s

Any ideas? Thanks in advance.

[linksysinfo]

Jens Janssen wrote:
In a former posting I said that only WAN<->Wireles is affected, which I cannot hold true anymore.

Not true that is is just WAN<->WIFI.

WMM is qos for all wifi clients. (full stop) It enables QoS Prioritsation and not speed throughput over wifi.

It prioritises, but does not guarantee speed throughput. the slowness you get is more likely that the data has to be inspected to identify each packets Access Category and then prioritise each packet to send it on.

WMM is not that great a feature and is best left turned off. there is no point in trying to do speed tests and state it is slower, of course it will be.

Regards Simon
http://www.linksysinfo.org

[Jens Janssen]

Simon Slater schrieb:
WMM is qos for all wifi clients. (full stop) It enables QoS Prioritsation and not speed throughput over wifi.

Please, do not twist my words.

I was describing my observations, nothing more, nothing less. Never expected wonders. Full stop.

Simon Slater schrieb:
It prioritises, but does not guarantee speed throughput. the slowness you get is more likely that the data has to be inspected to identify each packets Access Category and then prioritise each packet to send it on.

There is no deep packet inspection. So the slowness cannot be explained with that. The classification is done by the application. The router simply reads the classification and puts the data into the corresponding queue (in case of downstream). Should not consume that much CPU time (and it does not as stated above).

If there is no or only little load on the medium by other clients, I expect maximum possible speed.

For everyone interested: Cisco has a good documentation of how QoS/WMM works ....

http://www.cisco.com/en/US/docs/solutions/Enterprise/Mobility/emob41dg/ch5_QoS.pdf