Poor performance of Atheros QCA6174 802.11ac (rev 32) (Killer Wireless 1535) https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1670041 The above issue fixed by: commit 3a9b76fd0db9f0d426533f96a68a62a58753a51e tcp: allow drivers to tweak TSQ logic https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3a9b76fd0db9f0d426533f96a68a62a58753a51e