Hsmda Buffer Pool Policy - Alcatel-Lucent 7450 Quality Of Service Manual

HSMDA Buffer Pool Policy

HSMDA buffer pool policies contain information the system uses to configure the individual
pool sizes and the root pools used by the class pools. The division between total provisioned
and total system buffers is based on the system-reserve parameter that defines the percentage
of buffers reserved for system use. The remaining buffers are placed in the provisioned root
buffer pools based on the weight associated with each root pool.
The eight class pools within the policy are defined with a root-pool parent association (1
through 8) and a percentage value. The parent associated with the class-pool defines the Agg-
Pool-Ptr-2 setting in the port class pools table for each port class pool using the class-pool.
For example, if class-pool 1 (aggregate control pool 0) is associated with root-pool 3
(aggregate control pool 10) within the policy, port class pools 0, 8, 16, 24, 32, 40, 48, 56, 64
and 72 will contain a value of 10 in Agg-Pool-Ptr-2. The percentage used to size the class pool
is applied to the class pool's root-pool size to derive the class pool size. The sum of the sizes
of the class pools parented by a root-pool may exceed (oversubscribe) the root-pool size.
System pools are managed similarly. The actual system port class pools and system aggregate
control pools (16 through 31) are not user configurable.
Default HSMDA Buffer Pool Policy
An HSMDA buffer pool policy named default always exists on the system and cannot be
deleted or edited. The default policy is used for ingress and egress on all HSMDAs until an
explicitly created HSDMA policy is defined on the HSMDA.
The default policy parameters are listed in
Quality of Service Guide
High Scale Ethernet MDA Capabilities
Table
Table 59: Default Policy Parameters
System Reserve
Percentage:
Root Pools:
Root-Pool 1 Weight:
Root-Pool 2 Weight:
Root-Pool 3 Weight:
Root-Pool 4 Weight:
Root-Pool 5 Weight:
Root-Pool 6 Weight:
59.
10%
75
25
0
0
0
0
773