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MPRQ (Multi-Packet Rx Queue) processes one packet at a time using simple scalar instructions. MPRQ works by posting a single large buffer (consisted of multiple fixed-size strides) in order to receive multiple packets at once on this buffer. A Rx packet is then copied to a user-provided mbuf or PMD attaches the Rx packet to the mbuf by the pointer to an external buffer. There is an opportunity to speed up the packet receiving by processing 4 packets simultaneously using SIMD (single instruction, multiple data) extensions. Allocate mbufs in batches for every MPRQ buffer and process the packets in groups of 4 until all the strides are exhausted. Then switch to another MPRQ buffer and repeat the process over again. The vectorized MPRQ burst routine is engaged automatically in case the mprq_en=1 devarg is specified and the vectorization is not disabled explicitly by providing rx_vec_en=0 devarg. There is a limitation: LRO is not supported and scalar MPRQ is selected if it is on. Signed-off-by: Alexander Kozyrev <akozyrev@nvidia.com> Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com> |
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| README | ||
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DPDK is a set of libraries and drivers for fast packet processing. It supports many processor architectures and both FreeBSD and Linux. The DPDK uses the Open Source BSD-3-Clause license for the core libraries and drivers. The kernel components are GPL-2.0 licensed. Please check the doc directory for release notes, API documentation, and sample application information. For questions and usage discussions, subscribe to: users@dpdk.org Report bugs and issues to the development mailing list: dev@dpdk.org