stmmac/RTL8211F/Meson GXBB: TX throughput problems

Giuseppe CAVALLARO peppe.cavallaro at
Sun Sep 18 22:38:18 PDT 2016

Hello André

On 9/18/2016 10:42 PM, André Roth wrote:
> 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,


take a look at Documentation/devicetree/bindings/net/stmmac.txt


>  andre

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