Information Technology Reference
In-Depth Information
60
Optimal Smoothing
& MDR schedulers
(U = 500 Mbps)
50
40
Optimal Smoothing,
(U = 100 Mbps)
30
Optimal Smoothing
& MDR schedulers
(U = 1 Gbps)
20
MDR scheduler
(U = 100 Mbps )
10
0
10
20
30
40
50
60
70
80
90
System Utilization (%)
Figure 7.3a
Comparison of mean waiting time versus system utilization for the Optimal Smoothing
and the MDR schedulers (system bandwidth is equal to
U
)
6000
5000
Optimal Smoothing
& MDR schedulers
(U = 100 Mbps)
4000
Optimal Smoothing
& MDR schedulers
(U = 1 Gbps)
3000
Optimal Smoothing
& MDR schedulers
(U = 500 Mbps)
2000
1000
0
10
20
30
40
50
60
70
80
90
System Utilization (%)
Figure 7.3b
Comparison of worst-case waiting time versus system utilization for the Optimal Smooth-
ing and the MDR schedulers (system bandwidth is equal to
U
)
7.4.3 Client Buffer Requirement
Although Theorem7.2 shows that the generatedMDR schedule always has theminimumbuffer
requirement among all monotonic decreasing rate schedules, the actual buffer requirement still
depends on
A
(
t
) or the bit-rate profile of the video. Figure 7.4 shows the distribution of client
buffer requirements for the 274 videos tested. The average amount of client buffer required is
76.4 MB. Of the 274 tested videos, 78% require no more than 100 MB of client buffer and
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