Information about testbed configuration
--- tcp4-ge.uninett.no ping statistics --- 100 packets transmitted, 100 packets received, 0% packet loss round-trip min/avg/max/mdev = 0.166/0.223/0.286/0.034 ms
Experimental results
Note: in this experimental set-up synchronization of
end-system clocks is achieved with NTP; with the result that one-way delay
is substantially over-estimated and in particular, the absolute value
of one-way delay varies from test to test.
In what follows we will concentrate on the one-way delay behavior,
for example its frequency distribution function rather than on absolute
delay values. On the other hand, IPDV absolute values and distributions
are comparable from test to test.
Summary table: IPDV distribution
Test Num Type of scheduling configuration IPDV Frequency distribution (4 sec) ------------------------------------------------------------------------------------------- 4.1 No scheduling, no congestion 5%, 85%, 10% 4.2 MDRR, no over-estimation 2.5%, 45%, 30%, 20%, 2.5% 4.3 MDRR, over-estimation factor: 2 1%, 72%, 26%, 1% 4.4 MDRR, over-estimation factor: 3 6%, 72%, 22% 4.5 LLQ 36%, 61%, 3%Summary table: max IPDV
Test Num Type of scheduling configuration Max IPDV (msec) 1 sec 4 sec ----------------------------------------------------------------------------- 4.1 No scheduling, no congestion 0.124 0.138 4.2 MDRR, no over-estimation 0.104 0.105 4.3 MDRR, over-estimation factor: 2 0.111 0.131 4.4 MDRR, over-estimation factor: 3 0.107 0.138 4.5 LLQ 0.106 0.169