Enhancing Performance in PlanetLab: A High-Performance Multi-Application Overlay Network Platform

A High Performance,Multi-Alpplication,Overlay Network Platform Supercharging PlanetLab Reviewed by YoungSoo Lee CSL

Overview • PlanetLab has become a popular experimental platform. • But PlanetLab are subject to high latency, high delay jitter, poor performance. What is the Solution?

Solution

SSP’s Objectives • Higher level of both IO performance and processing performance. • Reasonably straightforward for PlanetLab users take advantage of the capabilities • Require t.hat legacy PlanetLab applications run on the system without change.

System Overview • Modern NPs are not designed to be shared. • Application are divided into Fast Path and Slow Path

System Components • Line Card(LC) : LC forwards each arriving packet to the system component, and queues outgoing packets for transmission. • General Purpose Processing Engines(GPE). • Network Processing Engines(NPE) • Control Processor(CP)

Network Processor Issues • NP products have been developed for use in conventional router. • Micro-Engines(ME) : packet processing. • DRAM : packet buffer. • SRAM : implementing lookup table & linked list queues. • MP : overall system control

Network Processor Issues • NP provides a different mechanism for coping with the memory latency gap, hardware multithreading. • Operate in a round-robin fashion.

Sharing the NPE • Develop software for the NPE that allows it to be shared by the fast path segments of many different slices. • Process 8 packets concurrently using the hardware thread contexts.

Sharing the NPE • Rx : packet received from switch are copied to DRAM & passes a pointer main packet processing pipeline. • Substr. : determines which slice the packet belongs & strips outer header form the packet. • Parse : preconfigured set of Code Option & form lookup key.

Sharing the NPE • Lookup : provides generic lookup capability. • Hdr Format : makes necessary changes to the slice-specific packet header. • Queue Manager : implements a configurable collection of queues. • Tx : forwards the packet to the output.

Enhancing GPE Performance • Boost performance of the GPEs. • 1. Use higher performance hardware configurations than usual for PlanetLab. • 2. Improve the latency of PlanetLab applications. • Changing coarse-grained scheduling paradigm

Enhancing GPE Performance

Overall System

Slice Configuration • ① : CP obtains slice configuration data using the standard PlanetLab mechanism of periodically polling the PLC • ② : Slices are assigned to one of GPE by GNM. • ③ : Corresponding entry is made in a local copy of my PLC. • ④ : The LNM on each of the GPEs periodically poll myPLC to obtain new slice configurations. ④ ① ② ③

Port Assignment • ① : LRM reservation request th the GRM. • ② : If the requested port number is available, it makes the appropriate assignment to LRM. • ③ : GRM configures the Line Card so that LC will forward to the right GPE. ① ③ ②

NPE Assignment • ① : LRM forwards the request to the GRM. • ② : GRM selects the most appropriate NPE to host the slice and returns its id to the LRM • ③ : LRM then interacts with the MP. ① ② ③

Evaluation • Implement two different application. • IPv4 & Internet Indirection Infrastructure.

IPv4-Fair Queueing Mechanism

IPv4 - Throughput

IPv4 - Latency

Internet Indirection Infrastructure

IPv4 & III- Throughput

III- GPE vs NPE

Enhancing Performance in PlanetLab: A High-Performance Multi-Application Overlay Network Platform

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