Available BandWidth Measurement Status Report

C. Edward Chow

After fixing several bugs in the packetAnalysis functions and adding an upper
layer process for handling the iteration, we now have a workable available bandwidth measurement program, abm release 0.3. 
To use the program, type
abm -l <lowerBoundOfBanwdith> -u <upperBoundOfBandwidth> -i <#iteration> target

Here is the result of an run from jen (PIII800MHz) to viva (P5, 150Mhz) via a hub,
[root@jen abwm]# abm -u 3000000 -i 3 192.168.0.192
Lower bound of probing bandwidth is set to 1000
Upper bound of probing bandwidth is set to 3e+06
The number of msgs sent is set to 10
msgSize is set to 1000
iteration is set to 3
hostname=192.168.0.192
cmd=abwm3 -l 1000.000000 -u 3000000.000000 -n 10 -s 1000 192.168.0.192
iteration 1: abw=0.000000, lbw=1500000.000000, ubw=6000000.000000,  reportNotValid
cmd=abwm3 -l 1500000.000000 -u 6000000.000000 -n 10 -s 1000 192.168.0.192
iteration 2: abw=9259717.098163, lbw=3036050.669562, ubw=28988710.151188,  reportNotValid
cmd=abwm3 -l 3036050.669562 -u 28988710.151188 -n 10 -s 1000 192.168.0.192
iteration 3: abw=15194178.241577, lbw=3036050.000000, ubw=35867912.346339,  reportValid
final estimate abw = 15194178.241577

The program automatically zooms out to find available bandwidth range.

Here is the result of a run from jen (PIII800MHz) to archie (PIII1GHz) via a dial up link (64kbps).

[root@jen abwm]# abm -u 1000000 -i 3 archie 
Lower bound of probing bandwidth is set to 1000
Upper bound of probing bandwidth is set to 1e+06
The number of msgs sent is set to 10
msgSize is set to 1000
iteration is set to 3
hostname=archie
cmd=abwm3 -l 1000.000000 -u 1000000.000000 -n 10 -s 1000 archie
iteration 1: abw=50849.014683, lbw=1000.000000, ubw=111997.810407,  reportValid
cmd=abwm3 -l 1000.000000 -u 111997.810407 -n 10 -s 1000 archie
iteration 2: abw=29679.300125, lbw=13299.618464, ubw=37999.155183,  reportNotValid
cmd=abwm3 -l 13299.618464 -u 37999.155183 -n 10 -s 1000 archie
iteration 3: abw=9147.937349, lbw=18999.500000, ubw=75998.000000,  reportNotValid
final estimate abw = 50849.014683


The program tries zoom in further but did not get more accurate result.

Here is another run from jen to archie but with higher upper bound 3000000 instead of 1000000.

[root@jen abwm]# abm -u 3000000 -i 3 archie 
Lower bound of probing bandwidth is set to 1000
Upper bound of probing bandwidth is set to 3e+06
The number of msgs sent is set to 10
msgSize is set to 1000
iteration is set to 3
hostname=archie
cmd=abwm3 -l 1000.000000 -u 3000000.000000 -n 10 -s 1000 archie
iteration 1: abw=150838.127904, lbw=1000.000000, ubw=334195.839786,  reportValidcmd=abwm3 -l 1000.000000 -u 334195.839786 -n 10 -s 1000 archie
iteration 2: abw=69391.532381, lbw=1000.000000, ubw=75047.627142,  reportValid
cmd=abwm3 -l 1000.000000 -u 75047.627142 -n 10 -s 1000 archie
iteration 3: abw=7804.128122, lbw=1000.000000, ubw=38020.640611,  reportNotValidfinal estimate abw = 69391.532381

It zooms in and get more precise results.

Further tests are needed for different bandwdith ranges and operating condition.