Ubuntu
iperf package

  1. Bug #1079212
  2. Comment #8

Comment 8 for bug 1079212

Revision history for this message
Serge Hallyn (serge-hallyn) wrote :

Was able to easily reproduce this now with just 'iperf -c <ip> -d". When I ran your longer loop before it never seemed to happen. I believe '-n 10' just made it transfer more data, which smoothed over the inequities here.

[ ID] Interval Transfer Bandwidth
[ 5] 0.0-10.0 sec 20.5 MBytes 17.1 Mbits/sec
[ 4] 0.0-10.0 sec 564 MBytes 471 Mbits/sec

I'm not sure there's really a bug here, as opposed to the host cpu doing the best it can to load-balance too much work. I'll re-try with raring now and look for any differences.