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Queue Scheduling
You can select the Queue Scheduling rule as follows:
Use an 8,4,2,1 weighted fair queuing scheme.
This is also known as
WRR
(Weight Round Robin)
.
JetNet will follow 8:4:2:1 rate to process the
packets in a queue from the highest priority to the lowest. For example, the
system will process 8 packets with the highest priority in the queue, 4 with
middle priority, 2 with low priority, and 1 with the lowest priority at the same
time.
Use a strict priority scheme.
Packets with higher priority in the queue will
always be processed first, except that there is no packet with higher priority.
Port Setting
CoS
column is to indicate default port priority value for untagged or
priority-tagged frames. When JetNet receives the frames, JetNet will attach
the value to the CoS field of the incoming VLAN-tagged packets. You can
enable 0,1,2,3,4,5,6 or 7 to the port.
Trust Mode
is to indicate Queue Mapping types for you to select.
COS Only:
Port priority will only follow COS-Queue Mapping you have
assigned.
DSCP Only:
Port priority will only follow DSCP-Queue Mapping you have
assigned.
COS first:
Port priority will follow COS-Queue Mapping first, and then
DSCP-Queue Mapping rule.
DSCP first:
Port priority will follow DSCP-Queue Mapping first, and then
COS-Queue Mapping rule.
Default priority type is
COS Only
. The system will provide default
COS-Queue table to which you can refer for the next command.
After configuration, press
Apply
to enable the settings.
4.7.2 CoS-Queue Mapping
This page is to change CoS values to Physical Queue mapping table. Since
the switch fabric of JetNet only supports 4 physical queues, Lowest, Low,
Middle and High. Users should therefore assign how to map CoS value to
the level of the physical queue.
In JetNet, users can freely assign the mapping table or follow the
suggestion of the 802.1p standard. Korenix uses 802.p suggestion as
default values. You can find CoS values 1 and 2 are mapped to physical
Queue 0, the lowest queue. CoS values 0 and 3 are mapped to physical
Queue 1, the low/normal physical queue. CoS values 4 and 5 are mapped
to physical Queue 2, the middle physical queue. CoS values 6 and 7 are
mapped to physical Queue 3, the high physical queue.
