Re: [PATCH net-next v2 8/9] microchip: lan865x: add driver support for Microchip's LAN865X MACPHY

[Andrew Lunn]

> 	spe1: ethernet@1{
> 		compatible = "microchip,lan865x";
> 		reg = <1>;
> 		interrupt-parent = <&gpio5>;
> 		interrupts = <0 IRQ_TYPE_EDGE_FALLING>;
> 		spi-max-frequency = <50000000>;

That is a pretty high frequency. It is actually running at that speed?

Have you tried lower speed?

> 		oa-tc6{
> 			#address-cells = <1>;
> 			#size-cells = <0>;
> 			oa-cps = <32>;
> 			oa-prote;
> 			oa-dprac;
> 		};
> 	};
> };
> 
> With this setup I'm getting a maximum throughput of about 90kB/s.
> If I increase the chunk size / oa-cps to 64 I get a might higher
> throughput ~900kB/s, but after 0-2s I get dump below (or similar).

Is this tcp traffic? Lost packets will have a big impact. You might
want to look at the link peer with tcpdump and look for retries. Also,
look if there are frames with bad checksums.

     Andrew