OK I went to the hidden page and found the switch, thank you. Can’t say I have a full impression yet but the results are interesting. All below are using a Balance One, 8.0 RC2, and a Spectrum consumer grade cable internet with an advertised speed of 100m down and 10m up.
Running the tests with Peplink’s bufferbloat turned off, the results are the same as they were with firmware 7.1.1. Pretty bad bufferbloat:
downlink the curved graph continued to climb reaching over 2100ms. Speed 115-118M.
uplink the curve graph climbed to about 800ms. Speed 11M.
8.0.0 RC2 with mitigate bufferbloat enabled:
As expected no change to downlink. Per @shivanik above, that feature has no effect in RC2.
Uplink is greatly improved. The curved graph generally bounced around 10 to 25 ms, thats 1/10th of what it was doing before.
No change to upload or download speeds
I played with the Peplink experimental feature of reducing the buffer size. The default is 2,000 frames. I tried 200 and 20. Neither of those improved anything. In fact the uplink had more bufferbloat with the reduced buffer size. I speculate that manually changing the buffer size may defeat the mitigate bufferbloat option. I changed it back to the default.
Next I experimented with the Upload and Download bandwidth settings on the WAN settings page, with mitigate bufferbloat enabled. The thought above that reducing the setting made sense. Ultimately after a dozen tests I came to the conclusion that there was no effect on bufferbloat. Interestingly, there was also no effect on download/upload speed, even when I set the download speed to 50m (half the expected speed). It still stayed in the range of 115m down and 11m up.
Seeing as that last test accomplished nothing, I thought what the heck let’s try it the other way. I increased the WAN settings for upload and download. I realize that would totally screw up the load balancing but I only have one WAN at home. I don’t know why but doing this helped the downlink bufferfloat quite a bit. At 500-800ms its still a poor test result but its a whole lot better than 2100ms. The uplink was not affected by this, still reporting very little bufferbloat. Upload and download speeds were not affected in any of these tests.
Far from a conclusive test but clearly the mitigate bufferbloat feature basically eliminates the problem on uplink I don’t know why increasing the download speed setting helped so much but it is repeatable.