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It looks like this is the source of the 2048 figure given in #10311. Calomel arrives at that by doubling the value of inline hw.igb.txd, which is exclusive to igb and em network interfaces. It doesn't look like igc, vtnet, mvneta, or ix, have this value or a single equivalent, but devices with those interfaces do show inline net.link.ifqmaxlen=128 as default. This is in 22.05 on an 1100, 4100, 5100, and KVM-based virtual machine.

Unless there's some other tunable(s) which makes use of inline net.link.ifqmaxlen on non-(if_em) interfaces, it looks like we need to specify that this only applies to those two network interface types. Is that correct?