I have QoS set to prioritize traffic on my WAN, and for the most part, it appears to be working exactly as expected.
I have traffic to and from a particular server tagged, and I run ping tests from our primary location to this server. I also have ping tests running to a server whos traffic is not prioritized.
For the most part, prioritized traffic appears to have lower latency than its non-prioritized counterpart. There are exceptions, however. See the attached image for more details. Although between 13:40 and 13:50 the overall latency is lower, the duration of the latency spike is higher. Can anyone think of what might be causing this?
There can be reasons which depend on factors about your network you haven't described.
However, assuming your WAN link is a p-2-p link, one factor can be priorization occurs with software queues that "engage" only after the interface hardware FIFO queue "overflows". Even with a minimum sized hardware FIFO queue, larger packets take longer to transmit.
I.e., background traffic can still slightly delay foreground traffic.
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