Alcatel-Lucent 7210 SAS-R6 OS Quality Of Service Manual page 64

QoS Overview
Table 23: TAF Impact on Shared Buffer Average Utilization Calculation (Continued)
TAF
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.
Page 64 7210 SAS-X and 7210 SAS-R6 OS Quality of Service Guide
Equates
TAF
2
To
512 1/512 (0.001953125)
9
2
10 1024 1/1024 (0.0009765625)
2
11 2048 1/2048
2
(0.00048828125)
12 4096 1/4096
2
(0.000244140625)
13 8192 1/8192
2
(0.0001220703125)
14 16384 1/16384
2
(0.00006103515625)
15 32768 1/32768
2
(0.000030517578125)
Shared Buffer
Instantaneous
Utilization Portion
Shared Buffer Average
Utilization Portion
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)