A Platform for High Performance Overlay Hosting Services

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1 A Platform for High Performance Overlay Hosting Services Jon Turner with Patrick Crowley, John DeHart, Brandon Heller, Fred Kuhns, Sailesh Kumar, John Lockwood, Jing Lu, Mike Wilson, Charlie Wiseman and Dave Zar

2 Overlay Hosting Services overlay hosting platform internet tunnels or provisioned links (MPLS,VLAN,...) local access via internet tunnels Shared infrastructure hosting overlay-based services Objectives for overlay hosting platform»internet-scale traffic volumes and consistently low latency»deployment target: first Planetlab, then commercial and GENI 2 - Jon Turner - 10/15/2007

3 PlanetLab Canonical overlay hosting service, using PC platform Applications run as user-space processes in virtual machines Effective and important research testbed But, low throughput and widely variable latency limits its potential as service deployment platform obtains slice descriptions from PlanetLab database 3 - Jon Turner - 10/15/2007 Node Manager Application 1 Application 2 Application 3 VM VM VM VM PlanetLab OS PlanetLab Node Network Interface standard socket programs token bucketbased scheduling of VMs

4 Supercharging PlanetLab exceptional packets forwarded to slow-path External Interfaces Node Manager Application 1 Application 2 Application 3 PlanetLab OS Network Interface Slow Path Data Interfaces Forwarding Infrastructure slow-path runs in a standard PlanetLab environment existing PlanetLab applications can run unchanged in slow path fast-path handles most traffic Application 1 Application 2 Application 3 Fast Path fast-path runs on a network processor Supercharged PlanetLab Platform (SPP) 4 - Jon Turner - 10/15/2007

5 SPP Components conventional server which coordinates system components and synchronizes with PlanetLab conventional server blades supporting standard PlanetLab environment Control Processor (CP) Line Card (LC) Switch General Purpose Processing Engine (GPE)... Network Processing Engine (NPE)... blade containing 10GE data switch and 1GE control switch dual Intel IXP 2850 blade which forwards packets to correct PEs dual Intel IXP 2850 blades supporting application fast-paths 5 - Jon Turner - 10/15/2007

6 ATCA Boards Intel server blades» for CP and GPE» dual Xeons (2 GHz)» 4x1GbE» on-board disk» Advanced Mezzanine Card slot Radisys NP blades» for LC and NPE» dual IXP 2850 NPs n n n 3xRDRAM 4xSRAM shared TCAM» 2x10GbE to backplane» 10x1GbE external IO (or 1x10GbE) Radisys switch blade» up to 16 slot chassis» 10 GbE fabric switch» 1 GbE control switch» full VLAN support Scaling up» 5x10 GbE to front» 2 more to back 6 - Jon Turner - 10/15/2007

7 What You Need to Build Your Own Qty Description Supplier Model 1 Dual Network Processor Module with IO Radisys A7K-PPM10-CFG002 2 Dual Network Processor Module A7010-BASE MB IDT TCAM Module A7010-TCAM-01-R 3 10 Gb/s Fabric Interface Card A7010-FIC-2X10G 1 10 GE/1GE Switch & Control Module A2210-SWH-CFG-01 1 RTM with extra IO ports A5010-SPM GE plugin modules (4 per kit) A2K-SFP-C 2 Server blade with 2 dual-core Xeon processors Intel MPCBL004N01Q 1 Zephyr 6 Slot ATCA Shelf Schroff ZR5ATC6TMDPEM2N 1 Shelf Manager Alarm Board ISAP2 1 1U Power Supply Shelf Unipower TPCPR1U3B 1 48 Vdc/25A Power Supply TPCP Vac/15A Power Cord Jon Turner - 10/15/2007

8 IXP 2850 Overview ME ME... ME Loc. Mem. TC TC... thread contexts ALU input MP MI output PCI,GigE SRAM SDRAM 16 multi-threaded MicroEngines (MEs)» 8 thread contexts with rapid switching capability» fast nearest-neighbor connections for pipelined apps 3 SDRAM and 4 SRAM channels (optional TCAM) Management Processor (MP) for control 8 - Jon Turner - 10/15/2007

9 Sharing the NPE forms key for lookup Forwarding Infrastructure Application Specific Code each application has private lookup entries Input Interfaces Parse App 1 App 2 App 3 Control Interface each application has private queues Fast-path Manager Lookup Header Format App 1 App 2 App 3 Output Interfaces formats outgoing packet headers NPE 9 - Jon Turner - 10/15/2007

10 System Control User PLC Internet Instantiate new application Open socket Instantiate fast-path Data Interfaces Control Interface Global Node Manager Global Resource Manager Line Card Manager Filter Filter CP LC Control Switch Local Node Manager Local Resource Manager... Fast-path Manager Fast-path... VM VM GPE NPE SPP 10 - Jon Turner - 10/15/2007

11 Basic Operational Demo bandwidth of outgoing streams bandwidth of incoming streams queue backlogs Traffic on 5 inputs going to single output» offset, but overlapping traffic bursts Each flow has different share of output bandwidth 11 - Jon Turner - 10/15/2007

12 Evaluation Slice 1 IPv4» packets arrive/depart in UDP tunnels Slice 2 Internet Indirection Infrastructure (i3)» packets contain triggers matched to IP addresses» no match at local node results in Chord forwarding IPv4 GPE-only Click Modular Router Data Interfaces SPP Filter Filter Filter Filter LC Switch i3 GPE-only IPv4 slow-path i3 slow-path GPE IPv4 fast-path i3 fast-path NPE conventional i3 standard IP forwarding single trigger matching and Chord forwarding 12 - Jon Turner - 10/15/2007

13 IPv4 Throughput Comparison output bandwidth (Mb/s) 10,000 1, x improvement for NPE x almost byte payloads improvement keeps for 0 byte up with payloads full line rate for 0 byte payloads 120B, 400B, 800B, 1400B 0B 120B 1400B 800B 400B ,000 10,000 input bandwidth (Mb/s) 0B NPE Click 13 - Jon Turner - 10/15/2007

14 So, what this means is... Xeon Server blade IXP 2850 NP blade = price-performance advantage of >15X 14 - Jon Turner - 10/15/2007

15 IPv4 Latency Comparison B, mean plus 3(std. dev.) Click 100 ping delays (ms) B, mean 1400B 8 IPv4 instances 15 - Jon Turner - 10/15/2007 NPE ,000 10,000 input bandwidth (Mb/s) 1400B 400B Measured ping delay against background traffic

16 IPv4/i3 Fast-Path Throughput Comparison 6.00 packet rate (Mp/s) IPv4 0B payload IPv4 40B payload i3 0B payload i3 40B payload i3 share Constant input rate of 5 Gb/s 16 - Jon Turner - 10/15/2007

17 Scaling Up slot chassis»3 Line Cards»2 switch blades»9 processing blades (NP or server) Multi-chassis systems»direct connection using expansion ports up to 7 chasses»indirect connection using separate 10 GbE switches up to 24 chasses 17 - Jon Turner - 10/15/2007

18 Other ATCA Components Sun dual 8-core UltraSparc Diversified Technologies 10 GbE Switch Blade Motorola dual Cavium NPs with 16 MIPS cores each Motorola 4xAMC carrier, with 10Gx1G switch Artesyn - AMC Compute blades Bitstream - AMC FPGA blades 18 - Jon Turner - 10/15/2007

19 Summary ATCA is important enabling development for overlay hosting services like GENI» market for open, programmable network subsystems» many vendors, variety of products» greater opportunity for network service innovation Growing role of multi-core processors» to use them effectively, must design for parallelism» requires deeper understanding of performance Conventional servers have dreadful performance on IO-intensive applications» partly hardware, but mostly software» to fix, need to push fast-path down into drivers and program for multi-core parallelism 19 - Jon Turner - 10/15/2007

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