I would know how to see real clients both download & upload speed.
Only via bandwith server tool?
yeah that is what i mean. especially when you use the bandwidthtool in tcp mode it took a lot extra cpu cycles to do all that tcp stack stuff. you know packet ordering and so. just forward a packet from one interface to another is much easier for the router. iirc a test with bandwidth tool (tcp mode) from a groove to a groove was less than 40Mbps while doing test with other tools where the grooves just had to forward the packets was full linespeed.you mean I will use 100% of cpu usage during bandwith test?
Look this for how use iperf i made it on my websiteyeah, everyone knows what iperf is.
I don't know how to set Routerboard as client.