2013/5/30 Maxime Ripard [off-list ref]:

Did you look at the load while iperf was running? I guess we can expect
it to be pretty high since it runs without DMA.

I just did the test.
cpu is at 55%-60%

root at debian:~# date ; iperf -c 192.168.1.10 -t 300 ; cat /proc/loadavg
Thu May 30 17:43:13 UTC 2013
------------------------------------------------------------
Client connecting to 192.168.1.10, TCP port 5001
TCP window size: 20.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.235 port 45459 connected with 192.168.1.10 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-300.0 sec  3.28 GBytes  94.0 Mbits/sec
0.83 0.71 0.43 1/46 1770

loadavg over a 5min at 0.71, yeah, that's pretty high...

Richard.