2015-09-21, 16:16
(2015-09-21, 15:13)vdb86 Wrote: Because I use usb extension cable (15cm) to connect the wireless adapter which is always at the same position with a clear line of sight in regards to router.
Physically how ever I plug-in that usb cable should not create any interference.
I've talked to the experts and there is the four sockets are all identical in terms of how they are connected to the hub chip and the software will treat them identically.
How reproducible is this? Can you make sure the wifi dongle is in the same position, and repeat the experiment. Try to move as little as possible between tests.
Report the iperf number for each socket. Reboot between each test. Test the sockets first in order 1,2,3,4 and then in order 4,3,2,1.
