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Tue, 29 May 2007

OpenBSD mbufs and tags.


They have been committed a major change for mbuf PF processing - *BSD stacks used to use tags behind mbuf to store various additional information related to packet processing, that memory is allocated in addition to quite big header, which is very slow. With above change PF related processing information is stored in mbuf structure.
That doubled PF performance.

I'm trying to recall how many years Linux does not use tags in skbs and stores everything in skb structure itself.

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