Bandwidth testing on the same subnet.

[bad_monkey]

I would like to know how to test the bandwidth between multiple wirelessly connected devices on the same subnet. I know that I could look up the theoretical bandwidths for whatever specification (N/G etc.) but I would like to know if I am actually approaching those limits. Thanks for the help.

 

[jlazzaro]

http://sourceforge.net/projects/iperf/

 

[spidey07]

Also keep in mind wireless is half-duplex so to get real world numbers don't use a one way stream. IPerf would work well just make sure you use TCP and not UDP.

Best possible throughput for G is 20-22 Mbs and that's in a perfect environment. There is a tremendous amount of overhead and management frames in wireless that cuts throughput to less than half of the actual data rate you're connected at.

 

[RadiclDreamer]

http://www.netchain.com/netcps/

 

[cmbrnt]

http://www.netchain.com/netcps/

That worked very well!

However, I wonder why 1Gb/s -> 1Gb/s resulted in ~21MB/s while 1Gb/s -> 100Mb/s resulted in ~10MB/s. Or is the result counted in megabits?

Gigabit to Gigabit:

C:\>NetCPS.exe -m1000 ghostface
NetCPS 1.0 - Entering client mode. Press ^C to quit
Connecting to 192.168.1.11 port 4455... Connected!
---> CPS  23445504.00  KPS: 22896.00  MPS: 22.36
Avrg CPS  21788592.00  KPS: 21277.92  MPS: 20.78
Peek CPS  24246272.00  KPS: 23678.00  MPS: 23.12
Done. 1048576000 Kb transferred in 48.13 seconds.

Gigabit to 100 Megabit:

C:\>NetCPS.exe -m1000 rza
NetCPS 1.0 - Entering client mode. Press ^C to quit
Connecting to 192.168.1.15 port 4455... Connected!
---> CPS  10777600.00  KPS: 10525.00  MPS: 10.28
Avrg CPS  10435253.00  KPS: 10190.68  MPS: 9.95
Peek CPS  10997760.00  KPS: 10740.00  MPS: 10.49
Done. 1048576000 Kb transferred in 100.48 seconds.

 

[bad_monkey]

The source code refers to Megabytes so...

 

[RadiclDreamer]

That worked very well!

However, I wonder why 1Gb/s -> 1Gb/s resulted in ~21MB/s while 1Gb/s -> 100Mb/s resulted in ~10MB/s. Or is the result counted in megabits?

Gigabit to Gigabit:

C:\>NetCPS.exe -m1000 ghostface
NetCPS 1.0 - Entering client mode. Press ^C to quit
Connecting to 192.168.1.11 port 4455... Connected!
---> CPS  23445504.00  KPS: 22896.00  MPS: 22.36
Avrg CPS  21788592.00  KPS: 21277.92  MPS: 20.78
Peek CPS  24246272.00  KPS: 23678.00  MPS: 23.12
Done. 1048576000 Kb transferred in 48.13 seconds.

Gigabit to 100 Megabit:

C:\>NetCPS.exe -m1000 rza
NetCPS 1.0 - Entering client mode. Press ^C to quit
Connecting to 192.168.1.15 port 4455... Connected!
---> CPS  10777600.00  KPS: 10525.00  MPS: 10.28
Avrg CPS  10435253.00  KPS: 10190.68  MPS: 9.95
Peek CPS  10997760.00  KPS: 10740.00  MPS: 10.49
Done. 1048576000 Kb transferred in 100.48 seconds.

Great, glad to help. This little app is fantastic, it doesnt use the hard disk at all so the speeds are not reliant on that, making it an even better test

 

[RadiclDreamer]

The source code refers to Megabytes so...

Yes, it is measured in megaBYTES and your 1000 speeds are a little on the low side. Some tweaking may be in order

 

[cmbrnt]

Yes, it is measured in megaBYTES and your 1000 speeds are a little on the low side. Some tweaking may be in order

Ah, of course. I forgot to tweak all the computers using TCP Optimizer before measuring. I guess that's what happens when you wonder what does ADHD stand for? and set up your first gigabit LAN with all new computers in just one day... Got any more tips other than on the physical layer?