Table of Contents
Advertisement
Adaptation Rulefor 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 X, R6 uses a rate step value based on the configured rate to define the granularity
for both the CIR and PIR rates (Please see the
values for details). The adaptation rule controls the method the system uses to choose the rate step
based on the administrative rates defined by the rate command.
Table 12: Supported Hardware rates for CIR and PIR values for 7210 SAS-R6
Rate (kbits_sec)
16384 - 32767
32768 - 65535
65536 - 131071
131072 - 262143
262144 - 524287
524288 - 1048575
7210 SAS-X and 7210 SAS-R6 OS Quality of Service Guide
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.
0 - 2047
2048 - 4095
4096 - 8191
8192 - 16383
Table 13
Rate Step Size (bits)
8
8
8
8
16
32
64
128
256
512
Supported Hardware Rates and CIR/PIR
QoS Policies
Page 41
Advertisement
Table of Contents
