From: Eric Dumazet <redacted>
Date: Fri, 08 Apr 2016 07:44:25 -0700

On Fri, 2016-04-08 at 19:18 +0800, Yang Yingliang wrote:

quoted

I expand  tcp_adv_win_scale and tcp_rmem. It has no effect.

Try :

echo -2 >/proc/sys/net/ipv4/tcp_adv_win_scale

And restart your flows.

I'm honestly beginning to suspect a bug in their driver and how they
handle skb->truesize.

Yang, until you show us the driver you are using and how is handles
receive packets, we are largely in the dark about a major component
of this issue and that is entirely unfair to us.