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Less copying, more batch optimisation (#820)
* Add probe module prepare_packet callback to reduce copying Introduce new prepare_packet callback for the initialization of send buffers; contrary to the per-thread initialization callback where this was done previously, prepare_packet can be called multiple times, once for each send buffer. Make use of this to prepare packets to send directly in the batch buffers instead of copying them over. * Remove ip field from batch and align IP header in batch buf The ip field was only still used in send-bsd and only on a failure path for logging, which does not seem like a strong justification for keeping it around, especially given that it can always be read from packet data. While removing the ip field, align buf such that the IP header is going to start at a 32 bit aligned address, improving perf of IP header field access.
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