Table 8: Supported Hardware Rates And Cir/Pir Values; Table 9: Supported Hardware Rates And Cir/Pir Values - Alcatel-Lucent 7210 SAS D Service Manual

QoS Overview
Adaptation Rule for Queues
The adaptation rule provides the QoS provisioning system with the ability to adapt specific CIR
and PIR defined administrative rates to the underlying capabilities of the hardware the queue will
be created on to derive the operational rates. The administrative CIR and PIR rates are translated to
actual operational rates enforced by the hardware queue. The rule provides a constraint used when
the exact rate is not available due to hardware implementation trade-offs.
For the CIR and PIR parameters individually, the system will attempt to find the best operational
rate depending on the defined constraint. The supported constraints are:
•
•
•
Depending on the hardware upon which the queue is provisioned, the actual operational CIR and
PIR settings used by the queue will be dependant on the method the hardware uses to implement
and represent the mechanisms that enforce the CIR and PIR rates.
The 7210 SAS E uses a single rate step value of 64to define the granularity for both the CIR and
PIR rates The adaptation rule controls the method the system uses to choose the rate step based on
the administrative rates defined by the rate command.
In 7210 SAS E devices, for the supported CIR/PIR range values 0 to 1Gb, the same hardware rate
step of 64 kbps is used.
In 7210 SAS D devices, for the supported CIR/PIR range values 0 to 1Gb, the same hardware rate
is shown in

Table 8: Supported Hardware Rates and CIR/PIR Values

64Kb/sec

Table 9: Supported Hardware Rates and CIR/PIR Values

Hardware Rate Steps
Kb/sec
16kbps
32kbps
Page 38
Minimum — Find the hardware supported rate that is equal to or higher than the specified
rate.
Maximum — Find the hardware supported rate that is equal to or lesser than the specified
rate.
Closest — Find the hardware supported rate that is closest to the specified rate.
Table 9.
Hardware Rate Steps Rate Range
0 to 1 Gb/sec
Rate Range (kbps)
0 - 16770 kbps
16780 - 33540 kbps
33550 - 67090 kbps
7210 SAS D, E OS Quality of Service Guide