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Date: Thu, 12 Oct 2023 15:58:57 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: Andrew Lunn <andrew@...n.ch>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>, Wei Fang <wei.fang@....com>,
 Shenwei Wang <shenwei.wang@....com>, Clark Wang <xiaoning.wang@....com>,
 Russell King <linux@...linux.org.uk>, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, linux-imx@....com,
 netdev@...r.kernel.org, Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>, Maxime Chevallier
 <maxime.chevallier@...tlin.com>
Subject: Re: Ethernet issue on imx6

On Thu, 12 Oct 2023 22:46:09 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> > //192.168.1.1 is my host, so the below lines are from the board:
> > # iperf3 -c 192.168.1.1 -u -b100M
> > [  5]   0.00-10.05  sec   113 MBytes  94.6 Mbits/sec  0.044 ms  467/82603 (0.57%)  receiver
> > # iperf3 -c 192.168.1.1 -u -b90M
> > [  5]   0.00-10.04  sec  90.5 MBytes  75.6 Mbits/sec  0.146 ms  12163/77688 (16%)  receiver
> > # iperf3 -c 192.168.1.1 -u -b80M
> > [  5]   0.00-10.05  sec  66.4 MBytes  55.5 Mbits/sec  0.162 ms  20937/69055 (30%)  receiver  
> 
> Have you tried playing with ‐‐pacing‐timer ?
> 
> Maybe iperf is producing a big bursts of packets and then silence for
> a while. The burst is overflowing a buffer somewhere? Smooth the flow
> and it might work better?
> 
>   Andrew
> 

Please post the basic system info.
Like kernel dmesg log.
All network statistics including ethtool.
Any special qdisc or firewall configuration.

Likely a hardware or driver bug that is doing something wrong
when a lot of packets are received.

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