Bufferbloat test

[Old J]

Hi!

When I'm doing the bufferbloat test from waveform.. is it normal to have max ping spikes between 200-600 under load? Idle ping is fine. I have a fibre connection 500/500. This is without QoS. I kinda believed that a fibre connection shouldnt fluctate THAT much under load. With QoS i can get an A + rating, but then it feels like the game (Valorant) is desynced like crazy. Also when im running tests on speedtest.net i can see that the under load ping spikes up to 300-500 on both up and down, yet the end result shows only 10 everytime. 

[Fuzy]

Can you provide screenshots please!

 

[Netduma Fraser]

Try Connection Benchmark, what results are you getting with Ping Under Load there?

[Old J]

I’m getting spikes up to the 40-60 range there, so not the same at all

[Netduma Fraser]

Okay so now, use Connection Benchmark and start with a high value for Congestion Control (set to Always), say 95% then do a test, decrease by 10%, test, decrease by 10% etc, until you get to a value that is pretty good and then try 5% either side of that value to see if it can be improved. It's important to note that Download & Upload on Congestion Control don't have to be the same value and that you may have a better experience with differing values.

[Old J]

Tried that many times but its not getting better, What DOES make it better tho is if i disable QoS and DPI. What does this mean? What happens when i disable DPI?

[Netduma Fraser]

The 3rd party tests aren't the best way to test, DPI can interfere with the test for example. If you want to check properly it's best to follow this guide: https://support.netduma.com/en/support/solutions/articles/16000074717-how-to-test-your-internet-ping while downloading constantly to saturate your network and do the above to find the best values. 

DPI is deep packet inspection, it analyzes the traffic and decides what to do with it e.g. prioritize it.

Either way, Bufferbloat only occurs when your network is saturated, with QoS enabled that cannot happen.