On Thu, 2015-10-08 at 09:44 -0700, Tom Herbert wrote: > I see. We are not using SO_INCOMING_CPU_MASK as a defense against > DDOS. It's used ensure affinity in application connection processing > between CPUs. For instance, if we have two NUMA nodes we can start two > instances of the application bound to each node and then use > SO_REUSEPORT and SO_INCOMING_CPU_MASK to ensure connections are > processed on the the same NUMA node. Packets crossing NUMA boundaries > even with RFS is painful.
Then maybe you need something simpler than a mask of cpus, like SO_INCOMING_NODE ? Note that this could also be automatically tuned. If you have a bunch of listeners on one port (could be 2), then the underlying node on which TCP socket was allocated could be used as a score modifier in compute_score() -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
