Hello. Recently I've bought and flashed OpenWRT onto Ubiquity EdgeRouter X, based on MT7621, which, as far as I know, should have good flow offloading capabilities. I have a 800/800 Mbps GPON connection, and I bridge that connection from my ONT terminal, doing the PPPoE authorization on a router itself. Hardware flow offloading is enabled in firewall settings. I don't use any QoS/SQM, so nothing like that should interfere.
When doing any kind of bandwidth tests (like usual speedtest.net), I can see that download speed is on the same level as stated in plan I use. However, upload speed gets stuck at ~450 Mbps no matter what. I see the same results when only software offloading is enabled, and when offloading is disabled, both download and upload get stuck on ~450 Mbps. Also, when looking on htop when doing speedtest, I can see that all cores are getting under load both with hardware and software offloading.
My guess is that hardware flow offloading does not work completely, and software flow offloading only works for download. I've tested it with both 19.07 and lastest trunk snapshot (both of them are cusom builds, buth with only difference being various prebuild packages and changed optimization level to -O2). With my previous router, TP-Link Archer C7 v2, nothing like that was seen, it could throughput ~650 mbps both on download and upload with PPPoE (possibly because of hardware limitations), and the whole ~800 mbps using regular IPoE with NAT from ONT terminal. Though I can't test EdgeRouter in NAT mode, since it would requireresetting the ONT terminal, and 6in4 tunnels do not work with NAT even if you have static IP and DMZ.
Did anyone else experience a similar situation, with upload throughput lower than possible? If so, is it possible to fix that?