netdev - Request for backport of 78dc70ebaa38aa303274e333be6c98eef87619e2 to 4.19.y

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Message-ID: <CAM7CaVQf-xymnx8y-nn7E3N6P5=-HF2i_1XhFgp1MZB1==WZiA@mail.gmail.com>
Date:   Mon, 24 Aug 2020 16:35:29 +0200
From:   Robert Bengtsson-Ölund 
        <robert.bengtsson-olund@...inor.se>
To:     netdev@...r.kernel.org
Subject: Request for backport of 78dc70ebaa38aa303274e333be6c98eef87619e2 to 4.19.y

Hi everyone

We stumbled upon a TCP BBR throughput issue that the following change fixes.
git: 78dc70ebaa38aa303274e333be6c98eef87619e2

Our issue:
We have a transmission that is application limited to 20Mbps on an
ethernet connection that has ~1Gbps capacity.
Without this change our transmission seems to settle at ~3.5Mbps.

We have seen the issue on a slightly different network setup as well
between two fiber internet connections.

Due to what the mentioned commit changes we suspect some middlebox
plays with the ACK frequency in both of our cases.

Our transmission is basically an RTMP feed through ffmpeg to MistServer.

Best regards
/Robert

-- 
Robert Bengtsson-Ölund, System Developer
Software Development
+46(0)90-349 39 00

www.intinor.com

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