Tony wrote:
From the card above you can see that unclassified traffic (COS 0)
will start getting discarded at 40% and as the queue gets fuller it
will progressively discard more. If the queue gets to 70% then ALL
COS0 traffic will be discarded. In queue 1 this 30% at the top of
the queue is for COS 2 & 3 packets in threshold 2.
This theoretically means that the maximum throughput you would see on
the above card with just enabling QOS and not configuring anything is
around 700Mbps (70% of 1Gbps). in reality it would probably be a bit
less, but that would be absolute maximum
Can you clarify this for me? If 999Mbps of traffic is arriving on an
'ingress' port and is the only traffic leaving on an 'egress' port,
there shouldn't be much if any queueing, right? Queueing should only be
occurring when the (instantaneous) packet arrival rate exceeds the rate
at which the device can dispatch the packets, and as those queues get to
various thresholds of %-full, they'll execute WRR to manage the queue
depth, correct?
pt
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