Brocade Multi-Service IronWare QoS and Traffic Management Configuration Guide (Supporting R05.6.00) - Manual (Page 173)

Multi-Service IronWare QoS and Traffic Management Configuration Guide 159
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Enhanced buffer management for NI-MLX-10Gx8 modules and NI-X-100Gx2 modules
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Enhanced buffer management for
NI-MLX-10Gx8 modules and NI-X-100Gx2 modules
The prioritized buffer-pool feature establishes two buffer-pools, gold buffer-pool for high priority
traffic and bronze buffer-pool for low priority traffic. Each internal priority can be associated with
either the gold buffer-pool or the bronze buffer-pool. High priority traffic is guaranteed buffers even
in the presence of bursty low priority traffic. This is only applicable to 8x10G and 2x100G modules.
The Virtual Output Queue (VOQ) size configuration enables the user to increase the queue size.
Enhanced Packet Buffer Management
Two buffer-pools are established, gold buffer-pool for high priority traffic and bronze buffer-pool for
low priority traffic. Each internal priority can be associated with either the gold buffer-pool or the
bronze buffer-pool. This guarantees buffers for high priority traffic, even in the presence of bursty
low priority traffic. By default the internal priority/queue-type 7 is associated with the gold
buffer-pool and the internal priorities/queue-types 6-0 are associated with the bronze buffer-pool.
Enhanced Packet Buffering Considerations
• For the 8x10G family, the buffer-pools apply only to unicast forwarded traffic for the 8x10G
family.
• For the 2x100G family, the buffer-pools are common for
unicast/unknown-unicast/broadcast/multicast forwarded traffic.
The buffer-pools are calculated as follows: “Gold buffer-pool minimum guarantee percentage =
100% – Bronze buffer-pool percentage” and “Bronze buffer-pool minimum guarantee percentage =
100% – Gold buffer-pool percentage”. If the minimum buffer guarantee percentage is less than
“0”, then the minimum buffer guarantee percentage is “0”.
Default Configuration
For the 8x10 family of modules provides a minimum buffer guarantee for unicast control protocol
traffic. The Gold buffer-pool has 100% of physical memory and Bronze buffer-pool has 95% of
physical memory.
For 2x100G module - The goal is to provide a minimum buffer guarantee for unicast/multicast
control protocol traffic. The buffer-pool is shared between
Unicast/Broadcast/Unknown-unicast/Multicast. The Gold buffer-pool has 100% of physical
memory and Bronze buffer-pool has 95% of physical memory.
The system default is depicted in Figure 1 and Figure 2.