Download presentation
Presentation is loading. Please wait.
1
Customizing Virtual Networks with Partial FPGA Reconfiguration
Dong Yin, Deepak Unnikrishnan, Yong Liao Lixin Gao and Russell Tessier Funded by National Science Foundation Grant CNS Electrical and Computer Engineering University of Massachusetts, Amherst USA
2
Outline Network virtualization
FPGA as a network virtualization platform Customizing virtual routers with Partial FPGA reconfiguration Dynamic virtual router allocation Results Conclusions
3
Network Virtualization
Many logical networks share a physical network infrastructure Reduces costs Independent routing policies Key Challenges Isolation Performance Scalability Flexibility Usability
4
Network Virtualization Techniques
Software Full/Container virtualization ASIC/Network Processors Supercharging PlanetLab Juniper E series S/W ASIC Scalability High Limited Flexibility Performance Low Isolation Moderate Usability Good
5
FPGA as a Virtualization Platform
High performance Flexible hardware through reconfiguration Full reconfiguration Reprogram entire chip Chip shut down during reconfiguration Partial reconfiguration Reprogram ‘part’ of the chip Non-reconfigured regions can still operate during reconfiguration
6
FPGA as a Virtualization Platform
Key Challenges Resource isolation between virtual routers Scalability - Limited on-chip logic In this paper, Use partial reconfiguration for better resource isolation between virtual routers Combine software virtual routers with hardware routers to create a scalable system
7
System Overview NIC NIC Linux NetFPGA OpenVZ VRouter OpenVZ VRouter
Software bridge Linux Kernel driver PCI 1G Ethernet I/F SDRAM SRAM PHY HW VRouter SDRAM HW VRouter SRAM NetFPGA
8
Reconfigurable Region
Architecture Fwd Logic Fwd Table PRR1 PRR2 CPU Transceiver MAC RXQ CPU RXQ MAC TXQ CPU TXQ Input Arbiter Design Select Output Queues PCI I/F Bridge OpenVZ Virtual Router VIP TYPE x.x.x.x HW y.y.y.y SW VID 1 CONTROL FPGA Static Reconfigurable Region Linux
9
Reconfigurable Region
Architecture Fwd Logic Fwd Table PRR1 PRR2 CPU Transceiver MAC RXQ CPU RXQ MAC TXQ CPU TXQ Input Arbiter Design Select Output Queues PCI I/F Bridge OpenVZ Virtual Router VIP TYPE x.x.x.x HW y.y.y.y SW VID 1 CONTROL FPGA Static Reconfigurable Region Linux 9
10
Dynamic Virtual Router Management
Virtual router requirements change over time Varying bandwidth/latency requirements Different routing policies -> Different h/w resources Solution - Exploit heterogeneity High throughput routers -> Hardware Low throughput routers -> Software Dynamically migrate virtual routers between s/w and h/w
11
Dynamic Virtual Router Management
Allocation Try allocation in software (if b/w permits) Else try allocation in hardware (if b/w and resources permit) Removal S/W - Destroy OpenVZ container H/W - Program blank bitstream to reconfigurable region Upgrades Greedily migrate virtual routers between FPGA and Software based on bandwidth requirement
12
Evaluation Source Virtual Router Sink
2 Partially reconfigurable virtual routers on Virtex II Software virtual routers - 3Ghz AMD X2 2GB RAM Metrics Throughput Reconfiguration time Packet generation NetFPGA packet generator Source NetFPGA Pktgen Virtual Router Sink NetFPGA Pktcap 1Gbps 1Gbps
13
Partial Bitstream Generation
Virtual router 2 (Verilog) Virtual router 1 (Verilog) Xilinx Early Access Partial Reconfiguration Partial bitstream repository PlanAhead JTAG
14
Throughput of Partially Reconfigurable Virtual Router
Consistent line rate (1Gbps) across packet sizes
15
Traffic Isolation and Reconfiguration Time
Full Reconfiguration Approach Fully Reconfigure FPGA eth OpenVZ H/W Virtual Router A Virtual Router B Source Sink MAC Qs Design Select Output S/W Bridge FPGA H/W Virtual router B’ Linux
16
Traffic Isolation and Reconfiguration time
Full reconfiguration 12 seconds Partial reconfiguration 20x reduction in downtime
17
Throughput per virtual router
Partial reconfiguration benefits at higher reconfiguration frequencies
18
Dynamic Virtual Network Allocation
Evaluation Model 1000 virtual networks Bandwidth distribution from PlanetLab nodes. Poisson arrivals and Poisson lifetimes Mean arrival period = 2hrs Mean lifetime = ~2.5 days (64 hrs) Bandwidth of live network changes according to Uniform distribution between 0%-X% from initial allocation b/w All networks can be either allocated in FPGA or Software virtual routers
19
Benefit of Virtual Network Migration
Upto 20% more upgrade requests serviced by dynamic assignment Reallocation benefits over wide fluctuations in bandwidth
20
Resource Usage and Power Consumption
FPGA # Partially Reconfigurable Virtual Routers Virtex II 2 Virtex 5 32 Power management via Clock gating Shutdown virtual routers when not in use Saves 10% overall power
21
Conclusion A novel heterogeneous network virtualization platform
Enhanced resource isolation and reconfiguration time With partial FPGA reconfiguration Scalable Combines fast FPGA virtual routers with software virtual routers Dynamic network allocation and migration Towards a green virtualization platform Integrates power management techniques
22
Future Work Usability Higher level abstractions for creating and managing partial bitstreams Explore non-JTAG interfaces for reconfiguration (PCI Express/ICAP)
23
Thank you Questions?
Similar presentations
