netdev - Re: [ISSUE: sky2 - rx error] Link stops working under heavy traffic load connected to a mv88e6176

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Message-ID: <5927FFAF.40301@aoifes.com>
Date:   Fri, 26 May 2017 12:13:03 +0200
From:   Rafa Corvillo <rafael.corvillo@...fes.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        netdev@...r.kernel.org
Subject: Re: [ISSUE: sky2 - rx error] Link stops working under heavy traffic
 load connected to a mv88e6176

As modifying sky2 code I have not could get any solution, then I have 
modified some parameters on the ethernet interface and using a MTU = 
1503 and disabling TSO (TCP Segmentation Offload) mechanism all 
communication errors disappear, both the rx errors due to too long 
packets and tx timeout errors. I have performed iperf tests during 1 
hour (downstream and upstream) and the performance of the ethernet is 
stable. Furthermore, disabling SG (scatter-gather) improves the 
throughput of the ethernet interface with traffic upstream.

Is it possible that these offload mechanism don't work fine with the 
sky2 driver?

Thanks,

Rafa