QOS issue with the Junos MX304 - 23.2R2-S2.5

The crux of the issue is as follows,

* 1000 Mbps service

* QoS service with multiple queues,

* 95% assigned for Bronze queue

* 5% reserved for Network queue

* All other queues, 0% assigned. <<< this is the queue to sending packets with large frame size.

Tail is drop is seen when sending large frame size packets where queue is allocated 0% guaranteed rate.

It's expected behaviour of having tail drop as there is 0% guaranteed rate set on queue and therefore the buffer size will also be very small for these queues. So that is the reason for large frame size to see tail drops.

Recommended not to assign 0% guaranteed rate set on queue.