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WRR in SF300 switch (QoS)

azi123
Level 1
Level 1

Hi,

 

I have an SF300 switch and I'm trying to learn QoS by testing and configuring different QoS settings. There are 4 egress queues per each port.

When I set the scheduler policy to weighted round robin (instead of strict priority mode) and test 2 sets of weights for egress ports, which are relatively equal, I see different results!

For instance, I set weights 1,1,1,3  for queues in the first scenario and the egress queues' packets are coming out of port, likely respecting weights.

But in the second scenario when I change the weights  into 3,3,3 and 9, without changing anything else, the egress direction of the port does not behave in compliance with the weights( the 4th queue, with the 9 weight in the second scenario, gets lower share  rather than first scenario) 

 

Is it normal to see this behavior from SF300 switch?

 

Best, Amir

 

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