Does the linux kernel in an SMP system guarantee that UDP packets arriving from a network in order will be read from a socket in order?

UDP does not guarantee any ordering whatsoever. It is the responsibility of the application. In fact it does not even guarantee that the packets won't be repeated/ dropped etc. I suggest you read: http://en.wikipedia.org/wiki/User_Datagram_Protocol.

You can't be guaranteed that a UDP packet won't get dropped during transmission, so you can't have any ordering guarantees. When the system receives, for example, packet #14 and packet #16, it has no way of knowing if it should wait for packet #15 to come in before delivering packet #16, or if packet #15 was dropped and will never come in. The system will just hand you a bunch of packets, and it's up to you to put them in order.

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