NDLI: SilkRoad: Making Stateful Layer-4 Load Balancing Fast and Cheap Using Switching ASICs

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SilkRoad: Making Stateful Layer-4 Load Balancing Fast and Cheap Using Switching ASICs

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SilkRoad: Making Stateful Layer-4 Load Balancing Fast and Cheap Using Switching ASICs

Content Provider	ACM Digital Library
Author	Kim, Changhoon Zeng, Hongyi Lee, Jeongkeun Yu, Minlan Miao, Rui
Abstract	In this paper, we show that up to hundreds of software load balancer (SLB) servers can be replaced by a single modern switching ASIC, potentially reducing the cost of load balancing by over two orders of magnitude. Today, large data centers typically employ hundreds or thousands of servers to load-balance incoming traffic over application servers. These software load balancers (SLBs) map packets destined to a service (with a virtual IP address, or VIP), to a pool of servers tasked with providing the service (with multiple direct IP addresses, or DIPs). An SLB is stateful, it must always map a connection to the same server, even if the pool of servers changes and/or if the load is spread differently across the pool. This property is called per-connection consistency or PCC. The challenge is that the load balancer must keep track of millions of connections simultaneously. Until recently, it was not possible to implement a load balancer with PCC in a merchant switching ASIC, because high-performance switching ASICs typically can not maintain per-connection states with PCC. Newer switching ASICs provide resources and primitives to enable PCC at a large scale. In this paper, we explore how to use switching ASICs to build much faster load balancers than have been built before. Our system, called SilkRoad, is defined in a 400 line P4 program and when compiled to a state-of-the-art switching ASIC, we show it can load-balance ten million connections simultaneously at line rate.
Starting Page	15
Ending Page	28
Page Count	14
File Format	PDF
ISBN	9781450346535
DOI	10.1145/3098822.3098824
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2017-08-07
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Programmable switches Load balancing
Content Type	Text
Resource Type	Article

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