Jumbo Frames for LS1028A

[sevi]

I'm using the Board LS1028ARDB for evaluating the Layerscape processor with Linux kernel 4.14.47 and interested in Network/USB3 performace. For the USB3 performance I'm using the gadget devices massstorage and RNDIS.

For the RNDIS device I'm reaching transfer rates up to 500 MBit/s which is not as good as I expected.

Is there a possibility to increase the MTU size > 1500?

Is the processor supporting JUMBO frames?

Thanks and best regards

[sevi]

As I've already written I'm using the RNDIS gadget. This means there is no Ethernet Phy because of using USB3 interface while the Ethernet device is emulated.

Therefore I think this is a processor specific thing.

For a Xilinx Ultrascale+ MPSoC I had the same issue and fixed it with following patch https://xilinx-wiki.atlassian.net/wiki/download/attachments/18841729/0001-Change-bMaxBurst-and-qlen-... 

wich is described in https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841729/Zynq+Ultrascale+MPSOC+Linux+USB+devic...

part "Ethernet Gadget".

This have not been worked for the NXP LS1028A device because of different hardware.

Is there a possibility to speed up the RNDIS performance for the NXP LS1028A controller? 

[bpe]

MTU is a characteristic of a network interface, not a processor. Since you are
using externally connected network interfaces, you should consult at
the documentation of those peripherals and their respective drivers
for supported MTU.

Have a great day,
Platon

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