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HPM5G Radio Tests
Toronto
8
2018-05-30

Overview

This document summarizes a series of tests on the Dragino HPM5G mPCIe radio module and the LibreRouter's 12 dBi antenna that are expected to ship with the soon-to-be-released LibreRouter bundle. Toronto Mesh acquired six radio boards and antennas from Dragino, and in this test, used a pair of the Marvell ESPRESSObin running prototype to test the radios.

Dragino HPM5G mPCIe radio module LibreRouter's 12 dBi antenna

We conducted many tests that are described in detail below, but our key findings are as follow:

  • The radio and antenna combo creates stable links over hundreds of metres at 150 Mbps
  • Wall penetration is excellent even when a client node has an omnidirectional antenna on a radio with average sensitivity
  • Continuous transmission for 10 minutes at 26 dBm show no performance drop or heating-related issues
  • Not all boards with a mPCIe interface can source enough current to this board, but external power input works great
  • The 12 dBi antenna makes an excellent 5G antenna even for other radios
  • Linux driver support is trivial, as expected from a ath9k device

Toronto Mesh is overall very impressed with the performance of these devices.

Issues

Using our ESPRESSObin setup, the HPM5G board was automatically identified and brought up on boot with the ath9k driver. Throughout testing, we observed a couple issues that we were able to work around.

Power Issues on the ESPRESSObin mPCIe

During the initial setup and testing we noticed that the ESPRESSObin would restart at what seemed to be random times. We tried different combination of radio boards and ESPRESSObin boards but the issue was persistent. We tried to reach out to the ESPRESSObin community without any luck; however the Armbian community mentioned that this seemed like an issue with insufficient power. Identifying this as a potential power issue we tried using larger amperage power supplies (1.5 and 2 A at 12 V) however this did not seem to solve the problem.

Work Around

After identifying a potential power problem we tried to limit the amount of power the radio would need by reducing the TX power of the radio. We found that keeping it around 14 dBm would let the ESPRESSObin operate without reboot. Our initial testing was then done using a 14 dBm TX power.

We did run into an issue where the TX power would not be persistent after being set, due to the Network Manager Service changing its value. The solution was to change the regulatory database to prevent TX power higher then 14 dBm. This held the TX power at 14 dBm.

Long-term Solution

This issue will occur on the ESPRESSObin and other boards that do not source enough current through its mPCIe interface. The LibreRouter mPCIe interfaces are designed to meet the power requirements of the HPM5G at 19 dBm. In later parts of this document, we will also describe a board modification that will allow us to power the HPM5G properly on the ESPRESSObin.

Uninitialized MAC Addresses on the HPM5G

Both HPM5G radios were brought up with the same MAC address of 00:02:03:04:05:06, which prevented two devices from talking to each other.

Additionally, the ESPRESSObin interfaces themselves seemed to be the same as well. This is an unrelated bug in Armbian.

Work Around

Setting the MAC address manually allowed the two devices to mesh together. For example:

sudo ip link set dev wlan0 address 00:28:C7:0A:42:A2
sudo ifconfig wlan0 hw ether 00:28:C7:0A:42:A2

The ESPRESSObin interface issue was resolved by regenerating a unique machine ID and rebooting:

sudo mv /etc/machine-id /etc/machine-id.old
dbus-uuidgen | sudo tee /var/lib/dbus/machine-id
sudo cp /var/lib/dbus/machine-id /etc/machine-id

Long-term Solution

This issue is specific to the sample units and will not be an issue when the HPM5G is manufactured for production.

Sending to an Omnidirectional Toplinkst TOP-4M02 USB Radio Through Walls

The first test we did to confirm the device was functioning was to connect an ESPRESSObin + HPM5G node to a Orange Pi Zero + TOP-4M02 node, using 802.11s mesh point. These two devices were about 25 feet apart separated by three drywalls, without line-of-sight, and with desks and file cabinets in between. The ESPRESSObin has the HPM5G transmitting at 15 dBm, its 12 dBi antenna pointed in the general direction towards the omnidirectional antennas on the Orange Pi Zero.

Office Map Receiving Node

The results of this first test were very impressive. The HPM5G was the transmitter, and the TOP-4M02 was the receiver:

Connecting to host 192.168.100.4, port 5201
[  4] local 192.168.100.1 port 52190 connected to 192.168.100.4 port 5201
[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  4]   0.00-1.00   sec  5.02 MBytes  42.1 Mbits/sec    0    465 KBytes
[  4]   1.00-2.00   sec  5.25 MBytes  44.0 Mbits/sec    0    465 KBytes
[  4]   2.00-3.00   sec  8.85 MBytes  74.3 Mbits/sec    0    465 KBytes
[  4]   3.00-4.00   sec  8.79 MBytes  73.8 Mbits/sec    0    465 KBytes
[  4]   4.00-5.00   sec  6.63 MBytes  55.6 Mbits/sec    0    465 KBytes
[  4]   5.00-6.00   sec  8.20 MBytes  68.8 Mbits/sec    1    465 KBytes
[  4]   6.00-7.00   sec  9.44 MBytes  79.2 Mbits/sec    0    465 KBytes
[  4]   7.00-8.00   sec  10.5 MBytes  88.4 Mbits/sec    0    465 KBytes
[  4]   8.00-9.00   sec  10.0 MBytes  83.9 Mbits/sec    0    465 KBytes
[  4]   9.00-10.00  sec  10.0 MBytes  84.2 Mbits/sec    0    465 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec  82.8 MBytes  69.4 Mbits/sec    1             sender
[  4]   0.00-10.00  sec  81.9 MBytes  68.7 Mbits/sec                  receiver

iperf Done.

These are the highest speeds we have observed from the TOP-4M02. The HPM5G is transmitting a very strong signal through all these physical barriers, and with low jitter:

Accepted connection from 192.168.100.2, port 43694
[  5] local 192.168.100.4 port 5201 connected to 192.168.100.2 port 47881
[ ID] Interval           Transfer     Bandwidth       Jitter    Lost/Total Datagrams
[  5]   0.00-1.00   sec   120 KBytes   983 Kbits/sec  0.299 ms  0/15 (0%)
[  5]   1.00-2.00   sec   128 KBytes  1.05 Mbits/sec  0.545 ms  0/16 (0%)
[  5]   2.00-3.00   sec   128 KBytes  1.05 Mbits/sec  0.560 ms  0/16 (0%)
[  5]   3.00-4.00   sec   128 KBytes  1.05 Mbits/sec  0.494 ms  0/16 (0%)
[  5]   4.00-5.00   sec   128 KBytes  1.05 Mbits/sec  0.432 ms  0/16 (0%)
[  5]   5.00-6.00   sec   128 KBytes  1.05 Mbits/sec  0.466 ms  0/16 (0%)
[  5]   6.00-7.00   sec   128 KBytes  1.05 Mbits/sec  0.388 ms  0/16 (0%)
[  5]   7.00-8.00   sec   128 KBytes  1.05 Mbits/sec  2.240 ms  0/16 (0%)
[  5]   8.00-9.00   sec   128 KBytes  1.05 Mbits/sec  1.051 ms  0/16 (0%)
[  5]   9.00-10.00  sec   128 KBytes  1.05 Mbits/sec  0.800 ms  0/16 (0%)
[  5]  10.00-10.04  sec  8.00 KBytes  1.79 Mbits/sec  0.802 ms  0/1 (0%)

HPM5G reported RX:

signal:         -75 [-75, -77] dBm
signal avg:     -72 [-73, -75] dBm

TOP-4M02 reported RX:

signal:         -50 dBm
signal avg:     -50 dBm

Testing a Pair of HPM5Gs

Placing two ESPRESSObins with HPM5Gs about 20 cm from each other, and lowering the TX power to 5 dBm, I was able to confirm speeds of over 160 Mbps.

Testing the LibreRouter Antennas

We married an Orange Pi Zero with a TOP-4M02 USB radio to the 12 dBi LibreRouter antenna for a long distance test. In the past, we have not had good range or speeds with this board, but since the board supported 5 Ghz and was 2x2 MIMO it was a good test.

We mounted the device with antenna outside to test, with the ESPRESSObin + HPM5G at the other end of the connection to compare RX quality:

Outdoor mount Orange Pi Zero antenna assembly

The devices were about 220 m apart:

Antenna test map

The positioning of the antennas were not optimal, however with this quick test the TOP-4M02 was able to see the HPM5G with -70 dBm, while the HPM5G could see the TOP-4M02 with -54 dBm. Speed was only 10 Mbps, however the link was very stable.

The antenna case can even be modified to fit the Orange Pi Zero inside:

Orange Pi Zero antenna assembly 2 Orange Pi Zero antenna assembly 3

Bridge Test

On a Tuesday afternoon we took the pair of ESPRESSObins to the bridges where we ran our Cantenna Field Test last year. The distance is approximately 300 m.

Bridge test map

Portable Power

We powered one ESPRESSObin with a portable AC power source. The other we attempted to use a 3-cell lithium polymer 1600 mAh battery wired into the DC barrel connector.

When fully charged the battery put out 12.5 V (12.6 V being the absolute max) and the ESPRESSObin seemed to work well with this setup. The test drained the power of the battery to about 50% of its capacity.

Test Setup and Results

We split up into two teams and connected a laptop to the USB port of the ESPRESSObin to record results, pointing the antenna in the general direction of the other team. One device had TX power of 15 dBm (but it occasionally reboots due to drawing too much power over the mPCIe) and iperf3 recorded speeds close to 100 Mbps. The other device with TX power of 14 dBm never rebooted, but it does not reach the same speeds when it's the one transmitting.

This is what one side looks like:

Bridge test self

And looking out to the peer:

Bridge test peer

Externally-powered HPM5G Test

Modifying the HPM5G for External Power Input

Dragino confirmed that what we were experiencing sounded like it could be a power issue, where the radio was draining more power from the ESPRESSObin than it could provide. After speaking with the engineer they provided a hardware modification to power the radio module externally, instead of via the mPCIe interface. It involves disabling of the 3.3 V to 5 V up-conversion circuit so that we could apply our own 5 V external power, by removing a surface mount resistor and grounding one of the pads.

Power instructions Power modifications

The modified HPM5Gs look like:

Modified HPM5G

Using the 5 V power from the ESPRESSObin's hard drive connecter, we were able to successfully power the boards externally using a modified cable:

Modified cable Externally powered setup

After removing the regulatory lockout in Linux, we were able to bring the radio module up to 26 dBm and run an endurance test for 10 minutes using iperf3 in both directions without the ESPRESSObin rebooting. This shows the earlier issue was indeed power related and the modification successfully fixed it. The power levels observed here is inline with what was reported by LibreRouter in their earlier tests, which took the HPM5G to 27 dBm TX power.

Testing the Externally-powered HPM5G on ESPRESSObin

Repeating the same 220 m antenna test with two fully powered ESPRESSObins and HPM5Gs using external power:

Antenna test map

These pictures are taken by placing the camera flat against the front of the antenna (point-of-view from the antenna):

Remote side antenna view Near side antenna view

The ESPRESSObins were configured at 26 dBm TX power.

Remote side:

signal:         -60 [-62, -65] dBm
signal avg:     -60 [-62, -64] dBm
tx bitrate:     243.0 MBit/s MCS 14 40MHz
rx bitrate:     135.0 MBit/s MCS 6 40MHz short GI
expected throughput:    53.557Mbps

Near side:

signal:         -62 [-70, -63] dBm
signal avg:     -59 [-67, -60] dBm
tx bitrate:     121.5 MBit/s MCS 6 40MHz
rx bitrate:     243.0 MBit/s MCS 14 40MHz
expected throughput:    42.388Mbps

iperf3 forward test:

root@tomesh-fd90:~# iperf3 -c 192.168.100.2 -t 60
Connecting to host 192.168.100.2, port 5201
[  4] local 192.168.100.99 port 35900 connected to 192.168.100.2 port 5201
[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  4]   0.00-1.00   sec  8.04 MBytes  67.4 Mbits/sec    0    308 KBytes
[  4]   1.00-2.00   sec  9.91 MBytes  83.2 Mbits/sec    0    376 KBytes
[  4]   2.00-3.00   sec  11.6 MBytes  96.8 Mbits/sec    0    826 KBytes
[  4]   3.00-4.00   sec  12.0 MBytes   101 Mbits/sec    0    826 KBytes
[  4]   4.00-5.00   sec  11.9 MBytes  99.5 Mbits/sec    0    826 KBytes
[  4]   5.00-6.00   sec  12.0 MBytes   100 Mbits/sec    0    826 KBytes
[  4]   6.00-7.00   sec  10.1 MBytes  84.7 Mbits/sec    0    826 KBytes
[  4]   7.00-8.00   sec  11.1 MBytes  92.9 Mbits/sec    0    826 KBytes
[  4]   8.00-9.00   sec  12.9 MBytes   108 Mbits/sec    0    826 KBytes
[  4]   9.00-10.00  sec  11.3 MBytes  95.0 Mbits/sec    0    826 KBytes
...
[  4]  51.00-52.00  sec  12.4 MBytes   104 Mbits/sec    0   2.10 MBytes
[  4]  52.00-53.00  sec  11.9 MBytes  99.9 Mbits/sec    0   2.10 MBytes
[  4]  53.00-54.00  sec  13.2 MBytes   111 Mbits/sec    0   2.10 MBytes
[  4]  54.00-55.00  sec  13.9 MBytes   117 Mbits/sec    0   2.10 MBytes
[  4]  55.00-56.00  sec  13.5 MBytes   113 Mbits/sec    0   2.10 MBytes
[  4]  56.00-57.00  sec  12.9 MBytes   108 Mbits/sec    0   2.10 MBytes
[  4]  57.00-58.00  sec  13.8 MBytes   116 Mbits/sec    0   2.36 MBytes
[  4]  58.00-59.00  sec  12.8 MBytes   107 Mbits/sec    0   2.36 MBytes
[  4]  59.00-60.00  sec  13.9 MBytes   117 Mbits/sec    0   2.36 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-60.00  sec   727 MBytes   102 Mbits/sec    0             sender
[  4]   0.00-60.00  sec   725 MBytes   101 Mbits/sec                  receiver

iperf Done.

iperf3 reverse test:

Reverse mode, remote host 192.168.100.2 is sending
[  4] local 192.168.100.99 port 35904 connected to 192.168.100.2 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec  15.6 MBytes   131 Mbits/sec
[  4]   1.00-2.00   sec  18.3 MBytes   154 Mbits/sec
[  4]   2.00-3.00   sec  17.6 MBytes   147 Mbits/sec
[  4]   3.00-4.00   sec  17.2 MBytes   144 Mbits/sec
[  4]   4.00-5.00   sec  18.2 MBytes   152 Mbits/sec
[  4]   5.00-6.00   sec  17.9 MBytes   150 Mbits/sec
[  4]   6.00-7.00   sec  18.6 MBytes   156 Mbits/sec
[  4]   7.00-8.00   sec  18.8 MBytes   158 Mbits/sec
[  4]   8.00-9.00   sec  19.2 MBytes   161 Mbits/sec
[  4]   9.00-10.00  sec  18.4 MBytes   154 Mbits/sec
...
[  4]  51.00-52.00  sec  18.9 MBytes   159 Mbits/sec
[  4]  52.00-53.00  sec  18.1 MBytes   152 Mbits/sec
[  4]  53.00-54.00  sec  18.7 MBytes   157 Mbits/sec
[  4]  54.00-55.00  sec  18.3 MBytes   154 Mbits/sec
[  4]  55.00-56.00  sec  18.4 MBytes   154 Mbits/sec
[  4]  56.00-57.00  sec  17.2 MBytes   144 Mbits/sec
[  4]  57.00-58.00  sec  17.8 MBytes   149 Mbits/sec
[  4]  58.00-59.00  sec  18.9 MBytes   159 Mbits/sec
[  4]  59.00-60.00  sec  18.7 MBytes   157 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-60.00  sec  1.07 GBytes   154 Mbits/sec    0             sender
[  4]   0.00-60.00  sec  1.07 GBytes   154 Mbits/sec                  receiver

iperf Done.

iperf UDP jitter test:

[  5]  50.00-51.00  sec   128 KBytes  1.05 Mbits/sec  0.542 ms  0/16 (0%)
[  5]  51.00-52.00  sec   128 KBytes  1.05 Mbits/sec  0.577 ms  0/16 (0%)
[  5]  52.00-53.00  sec   128 KBytes  1.05 Mbits/sec  1.735 ms  0/16 (0%)
[  5]  53.00-54.00  sec   128 KBytes  1.05 Mbits/sec  1.295 ms  0/16 (0%)
[  5]  54.00-55.00  sec   128 KBytes  1.05 Mbits/sec  0.757 ms  0/16 (0%)
[  5]  55.00-56.00  sec   128 KBytes  1.05 Mbits/sec  0.566 ms  0/16 (0%)
[  5]  56.00-57.00  sec   128 KBytes  1.05 Mbits/sec  0.556 ms  0/16 (0%)
[  5]  57.00-58.00  sec   128 KBytes  1.05 Mbits/sec  0.663 ms  0/16 (0%)
[  5]  58.00-59.00  sec   128 KBytes  1.05 Mbits/sec  0.880 ms  0/16 (0%)
[  5]  59.00-60.00  sec   128 KBytes  1.05 Mbits/sec  0.689 ms  0/16 (0%)
[  5]  60.00-60.04  sec  8.00 KBytes  1.50 Mbits/sec  0.668 ms  0/1 (0%)

Noticing the discrepancy between the forward and reverse tests, the antenna was repositioned tilting it downwards a few degrees. The link quality and speed test improved:

signal:         -54 [-57, -57] dBm
signal avg:     -58 [-61, -62] dBm
Toffset:        273322777 us
tx bitrate:     240.0 MBit/s MCS 13 40MHz short GI
rx bitrate:     300.0 MBit/s MCS 15 40MHz short GI
expected throughput:    53.557Mbps
root@tomesh-fd90:~# iperf3 -c 192.168.100.2 -t 30
Connecting to host 192.168.100.2, port 5201
[  4] local 192.168.100.99 port 35926 connected to 192.168.100.2 port 5201
[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  4]   0.00-1.00   sec  15.9 MBytes   134 Mbits/sec    0    945 KBytes
[  4]   1.00-2.00   sec  17.6 MBytes   147 Mbits/sec    0   1000 KBytes
[  4]   2.00-3.00   sec  17.4 MBytes   146 Mbits/sec    0   1000 KBytes
[  4]   3.00-4.00   sec  17.3 MBytes   146 Mbits/sec    0   1000 KBytes
[  4]   4.00-5.00   sec  17.8 MBytes   150 Mbits/sec    0   1000 KBytes
[  4]   5.00-6.00   sec  17.2 MBytes   145 Mbits/sec    0   1000 KBytes
[  4]   6.00-7.00   sec  17.1 MBytes   144 Mbits/sec    0   1000 KBytes
[  4]   7.00-8.00   sec  17.6 MBytes   148 Mbits/sec    0   1.09 MBytes
[  4]   8.00-9.00   sec  17.4 MBytes   146 Mbits/sec    0   1.22 MBytes
[  4]   9.00-10.00  sec  18.7 MBytes   158 Mbits/sec    0   1.22 MBytes
...
[  4]  21.00-22.00  sec  19.0 MBytes   159 Mbits/sec    0   1.77 MBytes
[  4]  22.00-23.00  sec  17.9 MBytes   150 Mbits/sec    0   1.77 MBytes
[  4]  23.00-24.00  sec  18.7 MBytes   157 Mbits/sec    0   1.77 MBytes
[  4]  24.00-25.00  sec  18.2 MBytes   152 Mbits/sec    0   1.77 MBytes
[  4]  25.00-26.00  sec  19.0 MBytes   160 Mbits/sec    0   1.85 MBytes
[  4]  26.00-27.00  sec  18.9 MBytes   158 Mbits/sec    0   1.85 MBytes
[  4]  27.00-28.00  sec  18.9 MBytes   159 Mbits/sec    0   1.85 MBytes
[  4]  28.00-29.00  sec  18.1 MBytes   151 Mbits/sec    0   2.20 MBytes
[  4]  29.00-30.00  sec  18.9 MBytes   159 Mbits/sec    0   2.20 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-30.00  sec   543 MBytes   152 Mbits/sec    0             sender
[  4]   0.00-30.00  sec   542 MBytes   151 Mbits/sec                  receiver

At this point I was going to test lowering the TX power, but a van pulled up next to me. Although the line-of-sight was not obstructed, the fresnel zone must have been impacted as the speeds dropped to about 80 Mbps:

[  4]   0.00-1.00   sec  8.43 MBytes  70.7 Mbits/sec    0    297 KBytes
[  4]   1.00-2.00   sec  9.65 MBytes  80.8 Mbits/sec    0    522 KBytes
[  4]   2.00-3.00   sec  9.44 MBytes  79.4 Mbits/sec    0    522 KBytes
[  4]   3.00-4.00   sec  9.10 MBytes  76.4 Mbits/sec    0    522 KBytes
[  4]   4.00-5.00   sec  9.20 MBytes  77.2 Mbits/sec    0    617 KBytes
[  4]   5.00-6.00   sec  9.79 MBytes  82.1 Mbits/sec    0    617 KBytes
[  4]   6.00-7.00   sec  10.6 MBytes  89.3 Mbits/sec    0    617 KBytes
[  4]   7.00-8.00   sec  9.44 MBytes  79.2 Mbits/sec    0   1.37 MBytes

I found a new spot closer to the antenna that was not obstructed and performed the TX power test there. This position was only about 74 m from the antenna.

The TX power was adjusted on both radios at the same time by running the iwconfig wlan0 txpower <txpower> command:

TX power Signal avg
24 dBm -52 [-55, -55] dBm
20 dBm -52 [-55, -56] dBm
15 dBm -59 [-60, -60] dBm

At 20 dBm:

[  4]   0.00-1.00   sec  18.4 MBytes   154 Mbits/sec    0   1.71 MBytes
[  4]   1.00-2.00   sec  18.8 MBytes   158 Mbits/sec    0   1.71 MBytes
[  4]   2.00-2.68   sec  12.9 MBytes   160 Mbits/sec    0   2.66 MBytes

At 15 dBm:

[  4]   0.00-1.00   sec  15.0 MBytes   126 Mbits/sec    0    527 KBytes
[  4]   1.00-2.00   sec  16.8 MBytes   141 Mbits/sec    0    792 KBytes
[  4]   2.00-3.00   sec  16.8 MBytes   141 Mbits/sec    0    792 KBytes
[  4]   3.00-4.00   sec  17.3 MBytes   145 Mbits/sec    0    905 KBytes
[  4]   4.00-5.00   sec  17.1 MBytes   143 Mbits/sec    0    945 KBytes
[  4]   5.00-6.00   sec  17.2 MBytes   144 Mbits/sec    0    945 KBytes
[  4]   6.00-7.00   sec  16.8 MBytes   141 Mbits/sec    0    945 KBytes
[  4]   7.00-8.00   sec  17.0 MBytes   142 Mbits/sec    0    945 KBytes
[  4]   8.00-9.00   sec  16.6 MBytes   139 Mbits/sec    0    945 KBytes
[  4]   9.00-10.00  sec  16.3 MBytes   136 Mbits/sec    0   1.63 MBytes

At 11 dBm:

[  4]   0.00-1.00   sec  10.7 MBytes  89.5 Mbits/sec    0    385 KBytes
[  4]   1.00-2.00   sec  12.4 MBytes   104 Mbits/sec    0    699 KBytes
[  4]   2.00-3.00   sec  11.9 MBytes  99.7 Mbits/sec    0    996 KBytes
[  4]   3.00-4.00   sec  9.17 MBytes  76.8 Mbits/sec    0    996 KBytes
[  4]   4.00-5.00   sec  8.68 MBytes  72.7 Mbits/sec    0    996 KBytes
[  4]   5.00-6.00   sec  12.5 MBytes   105 Mbits/sec    0    996 KBytes
[  4]   6.00-7.00   sec  11.6 MBytes  96.9 Mbits/sec    0    996 KBytes
[  4]   7.00-8.00   sec  9.78 MBytes  82.2 Mbits/sec    0    996 KBytes
[  4]   8.00-9.00   sec  12.1 MBytes   101 Mbits/sec    0    996 KBytes
[  4]   9.00-10.00  sec  10.7 MBytes  89.5 Mbits/sec    0    996 KBytes