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Optimizes the slow loops that rebalance the packet freelists. This change might not be worth the code: while it significantly reduces the latency of rebalancing operations (as observed using the timeline) in micro benchmarks, it does not have measurable impact on more realistic benchmarks like Vita’s
test.snabb, likely due to the fact that duplex packet flow avoids most of the need to rebalance freelists at all.Notably, when testing this change using Vita’s
test.snabba performance regression was observed, possibly due to 8f5569b (alignment?). Have do dig into that in case this optimization becomes relevant.