netdev - Re: stmmac/RTL8211F/Meson GXBB: TX throughput problems

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Date:   Sun, 18 Sep 2016 22:42:40 +0200
From:   André Roth <neolynx@...il.com>
To:     Giuseppe CAVALLARO <peppe.cavallaro@...com>
Cc:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        <netdev@...r.kernel.org>, <linux-amlogic@...ts.infradead.org>,
        Alexandre Torgue <alexandre.torgue@...com>
Subject: Re: stmmac/RTL8211F/Meson GXBB: TX throughput problems


Hello,

> For example, you could try disabling the scatter-gather or tx-cum
> via ethtool and seeing if there is some benefit; so we could image
> some problem on your HW or SYNP MAC integration for checksumming
> on tx side.

disabling the following: 
  ethtool -K eth0 sg off    
or:
  ethtool -K eth0 tx off    
does not prevent the network communication going down..

> Also you could check the AXI tuning and PBL value. To be honest
> (thinking about your problem) I can actually suspect some related
> problem on bus setup. So I suggest you to play with these value
> (better if you ask for having values from HW validation on your side).
> Otherwise the stmmac uses a default that cannot be good for your
> platform. For example, sometime I have seen that PBL is better if
> reduced to 8 instead of 32 and w/o 4xPBL...

how can I set those values ?

thanks for your time,

 andre