When i try to run iperf3 at ubuntu between client-server mode, it shows me the bitrate? I cant measure the Bandwidth with iperf3? Only with iperf?
I run the ONOS controller with a fattrew topology, and i tried to measured the bandqidth with iperf3, at client-server mode, but it shows only bitrate.
CodePudding user response：
It is helpful to paste the commands you are using (Along with flags), and then the resultant output.
In general both iperf and iperf3 are tools that generate some number of streams and then report back the bit-rate consumed by those streams.
The term bandwidth can be somewhat loaded as it can refer to different things, such as, the bandwidth available to the device, your link to the internet, the bandwidth between different machines, and so on.
CodePudding user response：
iperf/iperf3/netperf/whatnot can report only what they are able to see/measure. And in this case it happens to be the rate at which the iperf3 client can send data to the iperf3 server. It chooses by default to provide that answer in units of bits per second. You can see it is also reporting how many bytes were sent/received over that reporting interval. I know there are options to netperf to alter the reporting units for transfer rate. I assume there are similar options in iperf/iperf3 which would be described in their documentation.
iperf/iperf3/netperf do not truly know how TCP will be segmenting the traffic being sent, nor if there are other headers being used, so they cannot report how much link "bandwidth" is being consumed.