Hardy Griech

question: why don't you put the SysView files into the SEGGER subdirectory. Those are part of the more or less generic RTT support and would allow a user to easyly...

> On the bus I observed high delay between OUT and IN transfer, also between 2 OUT transfers for both NCM and NCM New. It could also be a linux...

Hmmm... don't know what to do here. Unfortunately I don't have any Hi-Speed device in my drawer, so incapable of checking the above. At least I have a project using...

Wow... those are great numbers. Out of curiosity: did you test different TCP_WND with RNDIS as well? And the other point: anything I can do on the driver side to...

Meaning, that RNDIS benefits only for MSS=800/1450 (and is still faster than NCM for this cases :-/). Buffer size: I have taken the 3200 from the original TinyUSB NCM driver....

Hmmm... currently checking Zephyr sources. They do not transmit frames from device -> host which are > NET_ETH_MAX_FRAME_SIZE, which is 1500+header_size

Yes, I had the feeling as well and as far as I remember I found a bug in iperf sources but was too busy/lazy to put the fix into their...

Ah... yes... one more thing: in function_ncm.c there is a definition of up/downlink speed. Never really tried values for tuning but perhaps the Linux NCM driver is smart and checks...

> PS: Just found kernel use 2048 as minimal size:... Meaning CONFIG_CDC_NCM_XMT/RCV_NTB_MAX_SIZE > 2048 ?

Interesting... when I implemented the driver, I did a lot of performance testing. And honestly: a lot was also guess work. One of the assumptions was, that having at least...