QoS and QoS Policies
98
Quality of Service Guide
3HE 11014 AAAC TQZZA Edition: 01
The order shown below is maintained when scheduling the traffic on the adapter
card’s network ports. A strict priority is applied between the four schedulers, and all
four schedulers are exhaustive:
• Expedited in-profile traffic
• Best Effort in-profile traffic
• Expedited out-of-profile traffic
• Best Effort out-of-profile traffic
3.4.3.2 Network Egress 4-Priority (Gen-3) Scheduling
The adapter cards and ports that support 4-priority scheduling for network egress
traffic on Gen-3 hardware are identified in Table 10. This type of scheduling takes
into consideration the traffic’s profile type and the CoS queue priority. It also uses
priority information to apply backpressure to lower-level CoS queues. See QoS for
Gen-3 Adapter Cards and Platforms for details.
3.4.3.3 Network Egress Scheduling on 8-port Ethernet Adapter
Cards
Network egress ports on the 8-port Ethernet Adapter card support both profiled
scheduling (rate-based scheduling) and 4-priority scheduling (queue-type
scheduling combined with profiled scheduling). Users can configure either
scheduling mode on a per-port basis. The default is profiled scheduling.
If a port is configured for profiled scheduling, packets less than or up to the CIR are
scheduled as in-profile and packets that arrive at rates greater than the CIR, but less
than the PIR, are scheduled as out-of-profile. In-profile traffic is exhaustively
transmitted from the queues before out-of-profile traffic is transmitted. That is, all of
the in-profile packets must be transmitted before any out-of-profile packets are
transmitted.
The following profiled schedulers service the queues in the order shown:
• in-profile scheduler
• out-of-profile scheduler
If a port is configured for 4-priority scheduling, the traffic on the port is scheduled in
the same way as with non-Ethernet cards and ports. For details, refer to Network
Egress 4-Priority Scheduling.
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