RiceNIC. Prototyping Network Interfaces. Jeffrey Shafer Scott Rixner
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1 RiceNIC Prototyping Network Interfaces Jeffrey Shafer Scott Rixner
2 RiceNIC Overview Gigabit Ethernet Network Interface Card RiceNIC - Prototyping Network Interfaces 2
3 RiceNIC Overview Reconfigurable and programmable Can alter both FPGA design and program embedded processors Built on commercial development board Reference design is freely available Targeted at research and education applications RiceNIC - Prototyping Network Interfaces 3
4 RiceNIC Target Applications Experimental research into network server architectures Explore hardware/software interface between OS and NIC Explore NIC architectures and desired functions Examples using RiceNIC TCP offload (at Rice) Run TCP stack on NIC Moved connection management from host OS to NIC Low Power Networking (at University of Florida) Adaptive MAC varies performance versus energy efficiency Virtual Machines (at Rice, EPFL and HP Labs) Each virtual machine can communicate independently with NIC RiceNIC - Prototyping Network Interfaces 4
5 Outline RiceNIC Introduction Competing Development Methods NIC Architecture and Implementation Applications Education and Research Lessons Learned Conclusions RiceNIC - Prototyping Network Interfaces 5
6 How to Build the RiceNIC Prototyping Tool? Buy a commercial software programmable NIC? Straightforward to rewrite firmware Used for previous research with mixed results Insufficient performance / flexibility for prototyping Build new board from scratch? Highly customizable Expensive / time consuming Use commercial prototyping board? Inexpensive / fast We Chose a Commercial Board. How Did it Turn Out? RiceNIC - Prototyping Network Interfaces 6
7 Avnet Development Board Serial Port DDR Virtex FPGA RJ-45 Port SRAM Spartan FPGA Ethernet PHY FPGA Development Board Virtex and Spartan FPGAs 2 PowerPC 405 processors 300 MHz Separate 16kB I and D-cache Serial Port PCI Interface 256 MB DDR Memory 2 MB SRAM Memory 56kB on-fpga memory Gigabit Ethernet PHY 64-bit / 66 MHz PCI bus RiceNIC - Prototyping Network Interfaces 7
8 System Architecture Avnet Hardware Avnet Memory Custom Design DDR-SDRAM (256 MB) DDR Controller Processor Local Bus (PLB) Avnet Development Board Serial Port Full Duplex Ethernet 2 GBits/sec UART RS-232 Ethernet PHY (10/100/1000) MAC Control DMA Unit BRAM Block BRAM Block Cache PowerPC 300MHz Cache PowerPC 300MHz SRAM (2MB) PCI Bridge (Spartan FPGA) PROM PCI Bus (64b / 66 MHz) RiceNIC - Prototyping Network Interfaces 8
9 FPGA Utilization Implemented with Xilinx tools (ISE and EDK) Used ChipScope on-chip logic analyzer Component Virtex FPGA Spartan FPGA Slice Flip Flops 9,089 / 27,392 33% 2,361 / 6,144 38% 4 input LUTs (Logic) 11,811 / 27,392 43% 2,504 / 6,144 40% BRAMs 51 / % 6 / 16 37% Occupied Slices 9,164 / 13,696 66% 3,070 / 3,072 99% Global Clocks 10 / 16 62% 2 / 4 81% Digital Clock Managers 5 / 8 62% N/A N/A RiceNIC - Prototyping Network Interfaces 9
10 Virtex FPGA Placement Ethernet MAC DDR Controller PowerPC Processors PLB & Control PCI DMA Engine RiceNIC - Prototyping Network Interfaces 10
11 Debugging Support Software Debugging Serial Console (RS-232 port) Command line interface to PowerPC processors Runtime debugging / configuration changes / bootstrapping Firmware Profiler Timer based statistical profiler (similar to Oprofile) Exports results via serial console Hardware Debugging Xilinx Chipscope on Virtex/Spartan FPGAs Essential Features Not Found in Other NICs RiceNIC - Prototyping Network Interfaces 11
12 Performance TCP streaming test (netperf) RiceNIC firmware using 1 processor High throughput for packets larger than 1000 bytes Spare capacity for researchers to prototype new systems RiceNIC - Prototyping Network Interfaces 12
13 RiceNIC Application - Education Added Network Address Translation module to RiceNIC firmware NIC still runs at full Ethernet speeds Project time 1 day Feasible for a class project Could have implemented similar module on any commercial software programmable NIC, but Debugging of NAT module by non-experts greatly assisted by RiceNIC serial console which printed packet traces RiceNIC - Prototyping Network Interfaces 13
14 RiceNIC Application Low Power MAC Energy Efficient Internet Project (at USF and UF) Replacing MAC core on RiceNIC FPGA with a custom low-power variant that supports adaptive link rates This research could not be done on any software-programmable NIC! The Energy Efficient Internet Project: RiceNIC - Prototyping Network Interfaces 14
15 RiceNIC Application Networking in Virtual Machines Each guest OS can talk directly to single shared NIC Separate interfaces for concurrent guests Experimental research project with many modifications FPGA provides isolated contexts in memory + event notification Firmware provides packet multiplexing / demultiplexing Xen / OS modifications Used 1 PowerPC processor and 12MB of RAM Guest OS Guest OS Guest OS Driver Driver Driver Xen Virtual Machine Monitor Context 1 Context 2 Context 3 RiceNIC (with modifications) Ethernet P. Willmann, J. Shafer, et.al, Concurrent Direct Network Access for Virtual Machine Monitors, The International Symposium on High Performance Computer Architecture (HPCA 07), Phoenix, AZ, (Feb 2007) RiceNIC - Prototyping Network Interfaces 15
16 RiceNIC Application - Virtualization Prototyping (with RiceNIC) critical to project success Could not use software programmable NIC Needed to change hardware architecture Software emulation too slow RiceNIC prototype ran at full speed Used RiceNIC to experimentally determine key architectural features Minimum on-nic packet buffer size per virtual machine Could not obtain equivalent results via simulation in a timely fashion Guest OS Guest OS Guest OS Driver Driver Driver Xen Virtual Machine Monitor Context 1 Context 2 Context 3 RiceNIC (with modifications) Ethernet RiceNIC - Prototyping Network Interfaces 16
17 Lessons Learned Use a commercial development board Avnet card perfect for RiceNIC Contains large FPGA, PCI, GigE, and memory Board arrived fully tested / documented Implementation can begin immediately Reduced up-front project expenses For low volume RiceNIC, might never be cheaper to fabricate a custom board RiceNIC - Prototyping Network Interfaces 17
18 Lessons Learned Design Time Design time Hardware (FPGA) design 1 year / 1 graduate student Software (firmware / driver) design 1 month / 1 graduate student Significant prior experience in writing NIC firmware Development stages Learning Xilinx ISE / EDK tools 1 month Time spent would be comparable with competing tools Design / Implementation 9 months Testing 3 months RiceNIC - Prototyping Network Interfaces 18
19 Lessons Learned Testing PCI core required extensive iterative testing Must work correctly on a wide variety of host computer systems with non-deterministic bus transfer and error timing characteristics Simulator can ignore these low-level issues but working prototype must function perfectly at even the most detailed level Saving grace - Fully-functional prototype lends confidence to experimental research RiceNIC - Prototyping Network Interfaces 19
20 Lessons Learned FPGAs well matched with requirements Clock rates required for gigabit NIC are achievable with modern FPGAs 66 MHz PCI interface, 100 MHz general logic, 300 MHz embedded processors Saved $$ and time versus creating an ASIC RiceNIC - Prototyping Network Interfaces 20
21 Lessons Learned How would you build a 10 Gigabit NIC? Make same design choice to use a commercial prototyping board Newer Avnet boards have larger FPGAs, PCI Express links, and 10G interfaces Prototyping boards closely follow the commercial state-of-the-art RiceNIC - Prototyping Network Interfaces 21
22 RiceNIC Usage RiceNIC is free for research and education applications Platform includes the FPGA configuration (bitstream), VHDL source code, embedded PowerPC firmware, and Linux device driver Purchase Avnet Virtex-II Pro development board Additional requirements to modify FPGA designs Xilinx development software (ISE, EDK, Chipscope) New licenses for the Xilinx MAC and PCI cores Can still modify firmware without any FPGA changes or additional licenses RiceNIC - Prototyping Network Interfaces 22
23 Conclusions Research into network system demands experimental prototypes Complex, asynchronous interactions among system components Simulation insufficient for new architectures Prototyping tools such as RiceNIC are critical for the development and understanding of future computer systems Development method was successful RiceNIC already used in several research projects at several institutions Would we use a commercial prototyping board to build the RiceNIC again? Yes! RiceNIC - Prototyping Network Interfaces 23
24 Questions? RiceNIC website: RiceNIC - Prototyping Network Interfaces 24
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