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The TX arena (128 x 9033B per routine) and GRO receive scratch (listen.batch x 64KiB per socket) stay at their worst-case bounds by design: the arena never grows past real demand and the GRO slots cannot be smaller without truncating coalesced superpackets. Document the listen.batch knob's memory implication so constrained hosts know what to tune. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>