In this page, so called, various UDP bandwidth values between the several @[HOSTS_TITLE] hosts are given as function of the time. These parameters are determined by the UDPmon package written by R.E. Hughes-Jones, the University of Manchester. In the "UDP Bandwidth and Packet Loss Measurements" section some lines from his description of the package are used to explain the measurement procedure.
In main terms the page, where the UDP bandwidth parameters are displayed, contains the following attributes:
In the "Measurement parameters" The UDP bandwidth parameter values are specified that are specifically used by this monitor.
Below a citation follows from the description of the UDP bandwidth measurements by R.E. Hughes-Jones.
In this package the bandwidth of the bottleneck, or the network section that limits the bandwidth in the route between the test nodes may be determined by measuring the times taken to send and receive a burst of frames send from node a to node b.
The test uses UDP/IP frames. The test starts with the Requesting node sending a "clear statistics" message to the Responder. On reception of the OK acknowledgment, the Requesting node sends a series of "data" packets separated with a given fixed time interval between the packets. At the end, the Requesting node asks for the statistics collected by the Responding node. Packet loss for the control messages are handled by suitable time-outs and retries in the Requesting node. The transmit throughput is found using the amount of data sent and the time taken; the receive throughput is calculated from the amount of data received and the time from the first data packet to the last data packet received.
Packet loss is measured by the remote or Responding node by checking that sequence numbers in the packets increase correctly, this also detects out-of-order packets. The number of packets seen, the number missed as indicated the sequence number check, and the number out-of-order are reported at the end of each test.
So far the citation from the description of the UDP bandwidth by R.E. Hughes-Jones. See the UDPmon page for more information.
The top control frame can be used to select the desired net test data. It is placed above all tables. The functionality of the control frame is for all tables more or less comparable. See also the help page for more information. In this page the procedure is also discussed for loading the net test data from the Web server.
In the bottom table frame, the table with UDP bandwidth values is shown. Going from above to below the following attributes are found:
The UDP bandwidth measurements are performed using the following parameters:
Description | Option | Value |
The UDP packet size | -p |
@[UDP_PACKET_SIZE] bytes |
The # UDP packets | -l |
@[UDP_NR_PACKETS] |
The wait time between two packets | -w |
@[UDP_WAIT_TIME] micros |