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Socket Direct Protocol over PCI Express Interconnect: Design, Implementation and Evaluation

Socket Direct Protocol over PCI Express Interconnect: Design, Implementation and Evaluation. By Ahmed Bukhamsin. Oct 2012. 1. Outline. PCI Express (PCIe) Overview PCIe Interconnect Proposed System Implementation Evaluation Conclusion. School of Computing Science / Ahmed Bukhamsin. 2.

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Socket Direct Protocol over PCI Express Interconnect: Design, Implementation and Evaluation

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  1. Socket Direct Protocol over PCI Express Interconnect: Design, Implementation and Evaluation By Ahmed Bukhamsin Oct 2012 1

  2. Outline • PCI Express (PCIe) Overview • PCIe Interconnect • Proposed System • Implementation • Evaluation • Conclusion School of Computing Science / Ahmed Bukhamsin 2

  3. PCI Express Overview 1 • PCI = Peripheral Component Interconnect School of Computing Science / Ahmed Bukhamsin 3

  4. PCI Express Overview 2 School of Computing Science / Ahmed Bukhamsin 4

  5. PCI Express Overview 3 • PCIe Evolution • High throughput • Low latency • Low power consumption • PCIe over cable * Aggregate bandwidth implies simultaneous traffic in both directions. School of Computing Science / Ahmed Bukhamsin 5

  6. PCIe Interconnect 1 • Issues with connecting two root complexes • Bus ownership • Endpoints resource allocation • Solution: Non-transparent bridge (NTB) School of Computing Science / Ahmed Bukhamsin 6

  7. PCIe Interconnect 2 • NTB isolates the connected PCIe domains • NTB provides a communication mechanism between the connected PCIe domains School of Computing Science / Ahmed Bukhamsin 7

  8. PCIe Interconnect 3 • NTB communication mechanism • Acquires memory in both systems • Provides address translation to allow data exchange • Provides doorbell and scratchpad registers accessible from both sides School of Computing Science / Ahmed Bukhamsin 8

  9. Proposed System 1 • We propose to develop the Socket Direct Protocol (SDP) • SDP makes it possible to run TCP based socket applications without modifications School of Computing Science / Ahmed Bukhamsin 9

  10. DMA Driver NTB Driver SDP Socket Preloaded Library IP TCP NIC Driver SDP Proposed System 2 User Space Applications Kernel Space Protocol Switch Communication API PCIe NTB Card Ethernet NIC School of Computing Science / Ahmed Bukhamsin 10

  11. DMA Driver NTB Driver IP TCP NIC Driver SDP Proposed System 2 User Space Applications • SDP Socket Preloaded Library • Rule based protocol switch SDP Socket Preloaded Library Kernel Space Protocol Switch Communication API PCIe NTB Card Ethernet NIC School of Computing Science / Ahmed Bukhamsin 11

  12. DMA Driver NTB Driver SDP Socket Preloaded Library IP TCP NIC Driver Proposed System 2 User Space Applications • SDP Socket Preloaded Library • Rule based protocol switch • SDP Kernel Module • The main component of the solution • Register itself as new address family • Implements all TCP functions Kernel Space Protocol Switch SDP Communication API PCIe NTB Card Ethernet NIC School of Computing Science / Ahmed Bukhamsin 12

  13. NTB Driver DMA Driver SDP Socket Preloaded Library IP TCP NIC Driver SDP Proposed System 2 User Space Applications • SDP Socket Preloaded Library • Rule based protocol switch • SDP Kernel Module • The main component of the solution • Register itself as new address family • Implements all TCP functions • Communication API • Group of functions exported by the driver for SDP to access the driver Kernel Space Protocol Switch Communication API PCIe NTB Card Ethernet NIC School of Computing Science / Ahmed Bukhamsin 13

  14. SDP Socket Preloaded Library IP TCP NIC Driver SDP Proposed System 2 User Space Applications • SDP Socket Preloaded Library • Rule based protocol switch • SDP Kernel Module • The main component of the solution • Register itself as new address family • Implements all TCP functions • Communication API • Group of functions exported by the driver for SDP to access the driver • DMA and NTB Drivers • Cards manufacturer drivers Kernel Space Protocol Switch Communication API DMA Driver NTB Driver PCIe NTB Card Ethernet NIC School of Computing Science / Ahmed Bukhamsin 14

  15. Create server Buffer Server Buffer Create client Buffer Interrupt Interrupt Interrupt Implementation 1 • SDP Connection Client Server Scratchpad registers - Listen() - accept() Server port Ready Conniction ID - Connect() client buf addr -Read Reg. Client Buffer IP and Port Server buff addr - Read registers Connection established Connection established School of Computing Science / Ahmed Bukhamsin 15

  16. send copy n copy 3 copy 2 send copy 1 send send recv n recv 3 recv 2 recv 1 Data Ready Signal DMA Data Copy msg 1 msg 2 msg n msg 3 Waiting ... Implementation 2 • Send and Receive Data Source Time Data Sink SDP Buf Application Application SDP Buf ... ... ... ... ... School of Computing Science / Ahmed Bukhamsin 16

  17. Evaluation 1 • Benchmarks • Throughput • Latency • CPU Utilization • Application Testing • Apache Web Server School of Computing Science / Ahmed Bukhamsin 17

  18. Evaluation 2 • Throughput School of Computing Science / Ahmed Bukhamsin 18

  19. Evaluation 3 • Throughput School of Computing Science / Ahmed Bukhamsin 19

  20. Evaluation 3 • Throughput School of Computing Science / Ahmed Bukhamsin 20

  21. Evaluation 3 • Throughput School of Computing Science / Ahmed Bukhamsin 21

  22. Evaluation 3 • Throughput School of Computing Science / Ahmed Bukhamsin 22

  23. Evaluation 4 • Latency School of Computing Science / Ahmed Bukhamsin 23

  24. Evaluation 5 • Application School of Computing Science / Ahmed Bukhamsin 24

  25. Evaluation 5 • Application School of Computing Science / Ahmed Bukhamsin 25

  26. Evaluation 5 • Application School of Computing Science / Ahmed Bukhamsin 26

  27. Evaluation 5 • Application School of Computing Science / Ahmed Bukhamsin 27

  28. Conclusion • We design and implement SDP • We evaluate it and compare it to SDP over Infiniband • Our SDP offers comparable performance to Infiniband for concurrent transfers of large message sizes • Application testing shows more u 10% improvement in performance over Infiniband • PCIe can serve as an interconnect for communication-intensive applications School of Computing Science / Ahmed Bukhamsin 28

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