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Abstract
En 中文
The emergence of programmable network devices and the increasing data traffic of datacenters motivate the idea of in-network computation. By offloading compute operations onto intermediate networking devices (e.g., switches, network accelerators, middleboxes), one can (1) serve network requests on the fly with low latency; (2) reduce datacenter traffic and mitigate network congestion; and (3) save energy by running servers in a low-power mode. However, since (1) existing switch technology doesn't provide general computing capabilities, and (2) commodity datacenter networks are complex (e.g., hierarchical fat-tree topologies, multipath communication), enabling in-network computation inside a datacenter is challenging.
In this paper, as a step towards in-network computing, we present IncBricks, an in-network caching fabric with basic computing primitives. IncBricks is a hardware-software co-designed system that supports caching in the network using a programmable network middlebox. As a key-value store accelerator, our prototype lowers request latency by over 30% and doubles throughput for 1024 byte values in a common cluster configuration. Our results demonstrate the effectiveness of in-network computing and that efficient datacenter network request processing is possible if we carefully split the computation across the different programmable computing elements in a datacenter, including programmable switches, network accelerators, and end hosts.
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