Hi Bob, Thank you once again for your reply.
I have actually checked that Iperf2 and Iperf3 behave differently. When I run the script which uses Iperf3, in the client screen an error message comes up saying the following: iperf3:error - unable to connect to server: Connection refused. The script in the server (in the virtual box), just stop running. When Iperf2 is used, it goes like you describe: the client goes on transmitting, and the script runs smoothly and receives packets. The script I run in the client machine is exactly the same, but changing Iperf3 for Iperf2. I hope I can keep using Iperf2 for my purposes. Cheers, Christian El mar., 11 jun. 2019 a las 7:37, Bob McMahon via Iperf-users (< iperf-users@lists.sourceforge.net>) escribió: > Well, I can speak from an iperf2 and WiFi perspective. > > The main performance things to measure are speed (latency) and > throughput. Throughput units is information over time, e.g. > megabytes/second. Speed or latency is units time. > > Most people measure throughput and think that's enough. Network adapter > cards are usually characterized by throughput as well, i.e 1Gb/s, 10Gb/s, > etc. But it's really not sufficient as the only metric. Latency should > also be measured. > > A "network power" metric can be better. It is something good (throughput) > divided by something bad (slower speed.) So it's Megabits/second squared, > hence the misnomer of "power." > > Speed is a bit tricky w/TCP but RTT gives hints at it. Note, we are > prototyping some direct TCP speed measurements. > > Other things to consider include the resources required to get the > information transferred. That's usually in memory, CPU, and energy (for > battery powered devices.) Iperf only hints at memory with things like the > CWND. > > More complex measurements deal with the shared nature of computer > networks. How fair is it when multiple TCP streams compete? Then with > WiFi it's more complex due to the access to the medium high costs which can > be amortized via aggregation technologies. > > Then there are things like traffic classes, i.e. prioritize one over > another in speed or throughput. > > There is more than this but this should get one new to performance > measurements started. > > Bob > > On Mon, Jun 10, 2019 at 7:40 PM Vidura Dantanarayana <vidur...@gmail.com> > wrote: > >> Hi everyone!! >> Bonjour!! >> >> I'm a beginner to performance testing and I was assigned to measure TCP >> performance between two aws ec2 machines. Can I know what kind of TCP >> related tests can be executed with iperf3? When compared perf tool and >> iperf what differences do they have in TCP performance testing. Have a nice >> day!! >> >> BR, >> Vidura Dantanarayana. >> _______________________________________________ >> Iperf-users mailing list >> Iperf-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/iperf-users >> > _______________________________________________ > Iperf-users mailing list > Iperf-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/iperf-users > -- Christian Sánchez
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