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Existing network stacks tackle performance and scalability aspects by relyingon multiple receive queues. However, at software level, each queue is processedby a single thread, which prevents simultaneous work on the same queue andlimits performance in terms of tail latency. To overcome this limitation, weintroduce COREC, the first software implementation of a concurrent non-blockingsingle-queue receive driver. By sharing a single queue among multiple threads,workload distribution is improved, leading to a work-conserving policy fornetwork stacks. On the technical side, instead of relying on traditionalcritical sections - which would sequentialize the operations by threads - CORECcoordinates the threads that concurrently access the same receive queue innon-blocking manner via atomic machine instructions from the Read-Modify-Write(RMW) class. These instructions allow threads to access and update memorylocations atomically, based on specific conditions, such as the matching of atarget value selected by the thread. Also, they enable making any updateglobally visible in the memory hierarchy, bypassing interference on memoryconsistency caused by the CPU store buffers. Extensive evaluation resultsdemonstrate that the possible additional reordering, which our approach mayoccasionally cause, is non-critical and has minimal impact on performance, evenin the worst-case scenario of a single large TCP flow, with performanceimpairments accounting to at most 2-3 percent. Conversely, substantial latencygains are achieved when handling UDP traffic, real-world traffic mix, andmultiple shorter TCP flows.

COREC: Concurrent Non-Blocking Single-Queue Receive Driver for Low Latency Networking