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have alignment problems. On small boxes (e.g. the net4501 from Soekris, featuring a 486/133) this provides huge performance benefits: the peak forwarding rate with avg.sized packets goes up by 50-70% because of this change alone. Faster CPUs might benefit less from this change, but in any case the CPU has better things to do than waste time on useless memory-to-memory copies. Several drivers (for Tulip-like cards) might benefit from a similar change. Right now the new behaviour is controlled by a sysctl variable, hw.sis_quick which defaults to 1 (on), you can set it to 0 to reintroduce the old behaviour (and compare the results). The variable is only there to show how much you can gain with this change, it will go away soon. Also, slightly simplify the code to initialize the ring buffers, and remove a couple of dangerous printf's which could trigger on any packet in case of mbuf shortage. MFC-after: 3 days
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