$ iperf -s -u -i 1 -w 400KB -l 3000
------------------------------------------------------------
Server listening on UDP port 5001
Receiving 3000 byte datagrams
UDP buffer size:  800 KByte (WARNING: requested  400 KByte)
------------------------------------------------------------
[  3] local 169.254.8.197 port 5001 connected with 169.254.8.196 port 60608
[ ID] Interval       Transfer     Bandwidth        Jitter   Lost/Total Datagrams
[  3]  0.0- 1.0 sec   110 MBytes   922 Mbits/sec   0.041 ms    0/38413 (0%)
[  3]  1.0- 2.0 sec   109 MBytes   918 Mbits/sec   0.028 ms    0/38231 (0%)
[  3]  2.0- 3.0 sec   109 MBytes   917 Mbits/sec   0.031 ms    0/38202 (0%)
[  3]  3.0- 4.0 sec   110 MBytes   919 Mbits/sec   0.029 ms    0/38289 (0%)
[  3]  4.0- 5.0 sec   109 MBytes   916 Mbits/sec   0.033 ms    0/38166 (0%)
[  3]  5.0- 6.0 sec   109 MBytes   918 Mbits/sec   0.038 ms    0/38236 (0%)
[  3]  6.0- 7.0 sec   110 MBytes   920 Mbits/sec   0.034 ms    0/38323 (0%)
[  3]  7.0- 8.0 sec   110 MBytes   919 Mbits/sec   0.042 ms    0/38283 (0%)
[  3]  8.0- 9.0 sec   110 MBytes   920 Mbits/sec   0.031 ms    0/38319 (0%)
[  3]  0.0-10.0 sec  1.07 GBytes   919 Mbits/sec   0.032 ms    0/382724 (0%)
[  3]  0.0-10.0 sec  1 datagrams received out-of-order
------------------------------------------------------------
Client connecting to 169.254.8.196, UDP port 5001
Sending 3000 byte datagrams
UDP buffer size:  800 KByte (WARNING: requested  400 KByte)
------------------------------------------------------------
[  3] local 169.254.8.197 port 60323 connected with 169.254.8.196 port 5001
[  3]  0.0- 1.0 sec   110 MBytes   926 Mbits/sec
[  3]  1.0- 2.0 sec   110 MBytes   925 Mbits/sec
[  3]  2.0- 3.0 sec   110 MBytes   923 Mbits/sec
[  3]  3.0- 4.0 sec   110 MBytes   925 Mbits/sec
[  3]  4.0- 5.0 sec   110 MBytes   923 Mbits/sec
[  3]  5.0- 6.0 sec   110 MBytes   923 Mbits/sec
[  3]  6.0- 7.0 sec   110 MBytes   923 Mbits/sec
[  3]  7.0- 8.0 sec   110 MBytes   923 Mbits/sec
[  3]  8.0- 9.0 sec   110 MBytes   920 Mbits/sec
[  3]  9.0-10.0 sec   108 MBytes   902 Mbits/sec
[  3]  0.0-10.0 sec  1.07 GBytes   921 Mbits/sec
[  3] Sent 383860 datagrams
[  3] Server Report:
[  3]  0.0-10.0 sec  1.07 GBytes   921 Mbits/sec   0.041 ms    0/383859 (0%)
[  3]  0.0-10.0 sec  1 datagrams received out-of-order

###### Comment: Receiving (and transmitting) UDP packets works up to ~920 Mbits/sec without any packet losses!

~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:26:2d:ae:70:b2  
          inet addr:192.168.10.1  Bcast:192.168.10.255  Mask:255.255.255.0
          inet6 addr: fe80::226:2dff:feae:70b2/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:3500  Metric:1
          RX packets:50351644 errors:0 dropped:0 overruns:0 frame:0
          TX packets:87419328 errors:0 dropped:0 overruns:0 carrier:8
          collisions:0 txqueuelen:1000 
          RX bytes:51694734299 (51.6 GB)  TX bytes:98098686521 (98.0 GB)
          Interrupt:44 


~$ uhd_fft -a "addr=192.168.10.2, recv_frame_size=3000, send_frame_size=3000, recv_buff_size=800000, send_buff_size=800000"  -s 25e6 
linux; GNU C++ version 4.6.3; Boost_104601; UHD_003.005.000-8-g49193c85

-- Opening a USRP2/N-Series device...
-- Current recv frame size: 3000 bytes
-- Current send frame size: 3000 bytes
Using Volk machine: sse4_2_64
O
(python:10685): LIBDBUSMENU-GLIB-WARNING **: Trying to remove a child that doesn't believe we're it's parent.

####  Comment: uhd_fft suddenly halts (stream of samples are stopped) after about a second or so!


$ ./benchmark_rate --args "addr=192.168.10.2, recv_frame_size=2500" --rx_rate 25e6
linux; GNU C++ version 4.6.3; Boost_104601; UHD_003.005.000-8-g49193c85


Creating the usrp device with: addr=192.168.10.2, recv_frame_size=2500...
-- Opening a USRP2/N-Series device...
-- Current recv frame size: 2500 bytes
-- Current send frame size: 1472 bytes
Using Device: Single USRP:
  Device: USRP2 / N-Series Device
  Mboard 0: N210
  RX Channel: 0
    RX DSP: 0
    RX Dboard: A
    RX Subdev: RFX2400 RX
  TX Channel: 0
    TX DSP: 0
    TX Dboard: A
    TX Subdev: RFX2400 TX

Testing receive rate 25.000000 Msps
OError code: 1
Unexpected error on recv, continuing...
Error code: 1

### Comment: What does "Unexpected error on recv, continuing... Error code: 1" stand for? It appears sooner or later at high sample rates.