[ynik]

The really horrible bufferfloat usually happens when the upload bandwidth is saturated -- upload bandwidth tends to be lower so it'll cause more latency for the same buffer size. I used to have issues with my cable modem, where occasionally the upload bandwidth would drop to ~100kbit/s (from normally 5Mbit/s), and if this tiny upload bandwidth was fully used, latency would jump from the normal 20ms to 5500ms. My ISP's customer support (Vodafone Germany) refused to understand the issue and only wanted to upsell me on a plan with more bandwidth. In the end I relented and accepted their upgrade offer because it also came with a new cable modem, which fixed the issue. (back then ISPs didn't allow users to bring their own cable modem -- nowdays German law requires them to allow this)