Alcatel-Lucent 7950 Quality Of Service Manual page 51

Table 12: TAF Impact on Shared Buffer Average Utilization Calculation (Continued)
TAF
5
6
7
8
9
10
11
12
13
14
15
The value specified for the TAF affects the speed at which the shared buffer average utilization
tracks the instantaneous shared buffer utilization. A low value weights the new shared buffer
average utilization calculation more to the shared buffer instantaneous utilization. When TAF is
zero, the shared buffer average utilization is equal to the instantaneous shared buffer utilization. A
high value weights the new shared buffer average utilization calculation more to the previous
shared buffer average utilization value. The TAF value applies to all high and low priority RED
slopes for ingress and egress buffer pools controlled by the buffer policy.
7950 XRS Quality of Service Guide
Equates
TAF
2
To
5 32 1/32 (0.03125)
2
6 64 1/64 (0.015625)
2
7 128 1/128 (0.0078125)
2
8 256 1/256 (0.00390625)
2
9 512 1/512 (0.001953125)
2
10 1024 1/1024 (0.0009765625)
2
11 2048 1/2048
2
(0.00048828125)
12 4096 1/4096
2
(0.000244140625)
8192 1/8192
13
2
(0.0001220703125)
14 16384 1/16384
2
(0.00006103515625)
15 32768 1/32768
2
(0.000030517578125)
Shared Buffer
Instantaneous
Utilization Portion
QoS Policies
Shared Buffer Average
Utilization Portion
31/32 (0.96875)
63/64 (0.984375)
127/128 (0.9921875)
255/256 (0.99609375)
511/512 (0.998046875)
1023/2024
(0.9990234375)
2047/2048
(0.99951171875)
4095/4096
(0.999755859375)
8191/8192
(0.9998779296875)
16383/16384
(0.99993896484375)
32767/32768
(0.999969482421875)
Page 51