On Fri, 2019-12-06 at 09:41 +0100, Johannes Berg wrote: > > Maybe somehow TSO is interacting badly with the TXQs and the tracking > here, since TSO makes the traffic *very* bursty? A 64k packet in the > driver will typically expand to 9 or 10 A-MSDUs I think? No, that all seems well. Without TSO (with the trivial mac80211 patch to let me turn it off with ethtool) I get about 890Mbps, so about 5% less. That's not actually *that* bad, I guess due to software A-MSDU in mac80211, but it's not really the right direction :) Changing wmem_max/tcp_mem to outrageous values also didn't really make any difference. I guess it's time to see if I can poke into the TCP stack to figure out what's going on... johannes
