I can't reach that value with a Dell OptiPlex GX280 w/ onboard bge(4)
MP kernel, net.inet.ip.ifq.maxlen=250, 4.0 or -current, doesn't matter.
Collision count increases monotonically. Stops forwarding packets, etc.
Switching to em(4) carries limit to ~25k to ~30k.

consider trying to increase ifq.maxlen higher than that and see if it helps. It did for me.

--Matt

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