Measurements of Internet performance for NIIT, Pakistan Jan 2004
Results:
Worldwide performance
| Performance is improving | |
| Developed world improving factor of 10 in 4-5 years | |
| S.E. Europe, C.Asia Russia, catching up | |
| India & Africa worse off & falling behind | |
| Developing world 3-10 years behind |
NIIT performance from U.S. (SLAC)
| red line is the cross-traffic | ||
| deduced by looking at the variation over and above the minimum packet pair separation, the | ||
| green line is the bandwidth capacity of current bottleneck | ||
| deduced from the minmum packet separation | ||
| blue line is available bandwidth = capacity-cross-traffic. | ||
| Transfer time to send a file of various sizes between 2 sites with given capacity | ||
| assume can utilize 50% of capacity | ||
| format hours:mins:seconds | ||
| Voice needs RTT < 250ms or else listener does not know when to speak | ||
| RTT > 400ms makes productive interactive work such as interactive telnet/X-windows style typing difficult | ||
| Screen does not match the keyboard, especially when correcting text | ||
| Losses: | ||
| Losses > 10% TCP connections fail | ||
| Losses >4-6% make video conferencing unintelligible for non-native language speakers | ||
| Losses of > 3-5% make TCP perform badly | ||
| Random loss of 2.5% will make Voice over IP annoying every 30 seconds or so | ||
| More realistic burst losses will cause VoIP to be annoying at >1% losses | ||
| ABwE available bandwidth estimator | ||
| www-iepm.slac.stanford.edu/bw/abwe/abwe-cf-iperf.html | ||