50% rate is just an average for 30 seconds. Traffic is never stable - so that can indeed go down in a certain moment - then that would mean that it can spike in the other one to sustain the rate of 50%. Those spike force the port to queue the triffic in the output buffer and if that is full to drop eventually. Those drops you see os out-discards.
QoS can help here as it not only allow you to spread traffic among the queues and give particular one a priority - but that laso allow you to fine tune your buffers depth also permitting those to take additional buffer from common pull.
media type should be match with the other end, for instance, you may have 100MB/s on your SWs' port the other end should also be 100MB/s, if 1000MB/s then the other end shouls also be 1000MB/s. and don't try to use the autonegotiate just set it to a specific speed and should be at the full-duplex to both ends. That's what i have found from CISCO, I've been encountered same issue you have had when I was on the network before.
Though I need to say that i my practise I've seen both. Somietime QoS enabled cause the drops with buffers/queues not being properly tuned. And I agree fine tuning might be a pain and not clear at all. However default performance and buffer capacity of the 3750 switch is quite low and I saw many cases when the default parameters affected throughput heavily due to exausted buffers.
So buffer tuning can make a good trick.
John you may check
show mls qos int gi1/0/13
show queueing int gi1/0/13 to see whcih queue is dropping most.
Then you can try disabling QoS globally to see if that is giving improvement. If not or if you still need to have some particular traffic prioritized then you can enable QoS back and tune the buffers.
the values you found above for buffer tuning are possibly too much for begining as it will also cause the commong bufer to be exausted more quickly thus other ports may not be able to get from it. So just increase that slightly for the queue which drop and monitor.
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