I'm not sure if I'm misunderstanding how QoS is meant to work on this router, but it certainly isn't behaving how I expect.
I have configured it to give High priority to the MAC address of computer A (connected via a Cat6 cable) and Low priority to computer B (connected via wireless N).
Computer A constantly runs "ping -t www.google.com". Computer B is running a bittorrent client which has a configuration option for an upload speed cap. The download speed of the client always averages 1kB/s and my upstream connection is capable of capable of 1.5MB/s down and 35kB/s up.
With QoS on and bittorrent uncapped, I get pings from 59-400ms, bittorrent gets 18kB/s up
With QoS on and bittorrent capped to 20kB/s, I get pings from 40-70ms, with spikes above 100ms, bittorrent gets 18kB/s up
With QoS off and bittorrent uncapped, I get pings from 800-1100ms, bittorrent gets 35kB/s up
With QoS off and bitorrent capped to 20kB/s, I get pings from 40-70ms, with spikes above 100ms, bittorrent gets 19kB/s up
With bittorrent off I get a rock steady ping of 29-31ms
There are two things to notice. Firstly, just turning QoS on causes bittorrent to get a slower upload speed even though nothing else on the network is uploading. Looking at the forums, this seems to be a known issue that can be solved by "overprovisioning" the upload speed on the router QoS settings page.
Secondly (and more importantly for me) even with QoS on and computer A at High priority and B at Low priority, enabling bittorrent plays hell with my recorded ping. This is really annoying because I wanted to use QoS to deprioritise torrent traffic while I am playing online games (which require a steady low ping).
What is going on here? Am I expecting QoS to do something it can't achieve, or is the E3000 really behaving unexpectedly?
