netdev - Re: debugging TCP stalls on high-speed wifi

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Date:   Mon, 16 Dec 2019 10:14:40 -0800
From:   Simon Barber <simon@...erduper.net>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Johannes Berg <johannes@...solutions.net>,
        linux-wireless@...r.kernel.org, ncardwell@...gle.com,
        netdev@...r.kernel.org, toke@...hat.com
Subject: Re: debugging TCP stalls on high-speed wifi

I see Macbook wifi clients seemingly randomly switch in and out of using GRO (I’ve not yet figured out a pattern to it), and the packet rate when they are doing GRO (on a download) is much lower, due to ACKing one in 8 packets instead of every other data packet. This has a big impact on performance.

Simon