yeah i that previous topic i was refering to CRS-326-24g-2s+ situation, when downloading from an uplink 1g interface towards a 100m interface
now i am remembering better
the switch in that scenario was not droping on egress, the droping was at ingress uplink interface as overflow errors, because of that i was suposing a HOL blocking situation, in that case all switch performance was degraded
some time later i dont see overflow errors anymore on CRS 3xxx switches now only tx drop mostly on slower outbound interfaces