netdev - Re: thunderx sgmii interface hang

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Date:   Mon, 18 Dec 2017 13:53:47 -0800
From:   Tim Harvey <tharvey@...eworks.com>
To:     Andrew Lunn <andrew@...n.ch>, Sunil Goutham <sgoutham@...ium.com>
Cc:     netdev <netdev@...r.kernel.org>
Subject: Re: thunderx sgmii interface hang

On Wed, Dec 13, 2017 at 11:43 AM, Andrew Lunn <andrew@...n.ch> wrote:
>> The nic appears to work fine (pings, TCP etc) up until a performance
>> test is attempted.
>> When an iperf bandwidth test is attempted the nic ends up in a state
>> where truncated-ip packets are being sent out (per a tcpdump from
>> another board):
>
> Hi Tim
>
> Are pause frames supported? Have you tried turning them off?
>
> Can you reproduce the issue with UDP? Or is it TCP only?
>

Andrew,

Pause frames don't appear to be supported yet and the issue occurs
when using UDP as well as TCP. I'm not clear what the best way to
troubleshoot this is.

Sunil, have any others reported this issue? I do not have a Cavium
CN80xx/CN81xx reference board that has SGMII.

Regards,

Tim