RN104 (perf) MTU / Jumbo Frames not working

PsykoGreg wrote:
I have just tested in direct link and it's working with 4k MTU/Jumbo parameters. I have use the second network interface of the nas RN104. So I have retry with the switch and with the second network interface of the nas and... it's working also :)

That seems a bit odd. Perhaps mdgm can tell something from the logs.

PsykoGreg wrote:
But the transfer rate has increased very slightly. :( 36Mo/s to 45Mo/s with 4088 MTU size and with 9k MTU size i obtain the same maximum transfer speed :( I hoped reach the 50 or 60 Mo/sec like between 2 computer with standard MTU size! I think really this nas has a performance problem, maybe network cards are very bad... I know the processor is light but for only files transfer it's sufficient.

Well, Jumbo frames aren't inherently faster. All they do is reduce the number of packets per second that the network card+CPU have to process. The more processing that the network card does (i.e. offloads from the CPU), the smaller the benefits. If you have a really fast network card combined with a really fast CPU you won't see any benefits at all.