The adaptation rule provides the QoS provisioning system with the ability to adapt the administrative rates provisioned for CIR and PIR, to derive the operational rates based on the underlying capabilities of the hardware. The administrative CIR and PIR rates are translated to actual operational rates enforced by the hardware meter. The rule provides a constraint when the exact rate is not available as a result of hardware capabilities.
The following table lists the hardware rate step-size for the 7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, 7210 SAS-Sx/S 1/10GE, and 7210 SAS-T.
| Rate (kbits_sec) | Burst (kbits_burst) | Rate step size (bits) | Burst step size (bits) |
|---|---|---|---|
0 to 4194296 |
0 to 16773 |
8000 |
4096 |
4194297 to 8388592 |
16774 to 33546 |
16000 |
8192 |
8388593 to 16777184 |
33547 to 67092 |
32000 |
16384 |
16777185 to 33554368 |
67093 to 134184 |
64000 |
32768 |
33554369 to 67108736 |
134185 to 268369 |
128000 |
65536 |
67108737 to 134217472 |
268370 to 536739 |
256000 |
131072 |
134217473 to 268434944 |
536739 to 1073479 |
512000 |
262144 |
268434945 to 536869888 |
1073480 to 2146959 |
1024000 |
524288 |
The following table lists the hardware rate step-size for the 7210 SAS-Sx 10/100GE.
| Rate (kbits_sec) | Burst (kbits_burst) | Rate step size (kb/s) | Burst step size (bits) |
|---|---|---|---|
8 to 16777208 |
4 to 16773 |
8 |
4096 |
16777209 to 33554416 |
16774 to 33546 |
16 |
8192 |
33554417 to 67108832 |
33547 to 67092 |
32 |
16384 |
67108833 to 134217664 |
67093 to 134184 |
64 |
32768 |
134217665 to 268435328 |
134185 to 268369 |
128 |
65536 |
268435329 to 536870656 |
268370 to 536739 |
256 |
131072 |
536870657 to 1073741312 |
536739 to 1073479 |
512 |
262144 |
1073741313 to 2147482624 |
1073480 to 2146959 |
1024 |
524288 |
The system attempts to find the best operational rate depending on the defined constraint. The supported constraints are the following:
minimum
Find the next multiple of step-size that is equal to or greater than the specified rate.
maximum
Find the nex t multiple of step-size that is equal to or less than the specified rate.
closest
Find the next multiple of step-size that is closest to the specified rate.
The following table lists the rate values configured in the hardware when different PIR or CIR rates are specified in the CLI.
| Administrative rate | Operation rate (min) | Operation rate (max) | Operation rate (closest) |
|---|---|---|---|
8 |
8 |
8 |
8 |
10 |
16 |
8 |
8 |
118085 |
11808 |
11800 |
11808 |
46375 |
46376 |
46368 |
46376 |
If the user has configured any value greater than 0 and less than 648, the operation rate configured on hardware is 648 kbps, regardless of the constraint used.
The configured burst size affects the rate step-size used by the system. The system uses the step size so that both the burst-size and rate parameter constraints are met. For example, if the rate specified is less than 4 Gbps but the configured burst size is 17 Mbits, the system uses a rate step size of 16 Kbits and a burst step size of 8192 bits (see Table: Supported hardware rates and burst step sizes for CIR and PIR values on the 7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, 7210 SAS-Sx/S 1/10GE, and 7210 SAS-T, row 2).
If the meter is a srTCM meter, both rate and burst constraints specified for both CBS and MBS are considered together to determine the step-size to use for CIR, CBS, and MBS parameters.
If the meter is a trTCM1 meter, the CIR rate and CBS burst parameters are considered together to determine the step-size to use for CIR and CBS parameters, and the PIR rate and MBS burst parameters are considered together to determine the step-size to use for PIR and MBS parameters.
If the meter is a trTCM2 meter, the CIR rate and CBS burst parameters are considered together to determine the step-size to use for CIR and CBS parameters, and the PIR (EIR) rate and MBS (EBS) burst parameters are considered together to determine the step-size to use for PIR (EIR) and MBS (EBS) parameters.