Sorting Reordered Packets with Interrupt Coalescing |
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Authors: | Wenji Phil Matt |
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Affiliation: | aFermi National Accelerator Laboratory, Computing Division, Fermilab MS-120, Batavia, IL 60510, USA |
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Abstract: | TCP performs poorly in networks with serious packet reordering. Processing reordered packets in the TCP-layer is costly and inefficient, involving interaction of the sender and receiver. Motivated by the interrupt coalescing mechanism that delivers packets upward for protocol processing in blocks, we propose a new strategy, Sorting Reordered Packets with Interrupt Coalescing (SRPIC), to reduce packet reordering in the receiver. SRPIC works in the network device driver; it makes use of the interrupt coalescing mechanism to sort the reordered packets belonging to the same TCP stream in a block of packets before delivering them upward; each sorted block is internally ordered. Experiments have proven the effectiveness of SRPIC against forward path reordering. |
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Keywords: | TCP Packet reordering Interrupt coalescing Protocol stack High performance networking |
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