Split/Merge: System Support for Elastic Execution in Virtual Middleboxes
summary
Split/Merge exposes a per-flow partitioning abstraction and implements it as FreeFlow: a VMM runtime plus an SDN controller module and a small library API that tags flow state, programs forwarding rules, buffers packets, moves flow state, and re-injects packets on migration. Coherent counters use eventual consistency with periodic syncs. FreeFlow runs Bro, eliminates hotspots during scale-out, cuts maximum latency by ~25%, and achieves about 50% faster scale-in versus standard approaches.
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