Yes, your kernel does resolve this bug. Measuring using,
before your kernel, using the current Bionic kernel, I get 8.64mbps on a
2.4Ghz network, with a max of around 10Mbs. Four minutes later, with
your kernel, 34.92Mbs with a max of around 50Mbs.

What is perhaps not so good, is that the performance of a 5Ghz network
has dropped dramatically from around 90 - 100 Mbs, down to 9.12 to
9.43mbps. Tested repeatedly over a few minutes to make sure it's not
just a one-off.

I'll install the stock kernel again, and check it's the patch, and not
some external factor.

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  Poor performance of Atheros QCA6174 802.11ac (rev 32) (Killer Wireless

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