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Towards Scalable SDN Switches: Enabling Faster Flow Table Entries Installation

机译:迈向可扩展的SDN交换机:启用更快的流表条目安装

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摘要

SDN applications operate the switching hardware in new ways, uncovering some strict constraints of current switching devices. The large flow table entries installation time is among these constraints, since it limits the applicability of hardware SDN switches, in particular in those applications that require a reactive logic. The source of this performance limitation lays in the technological solutions adopted by current ASICs, which typically rely on Ternary Content Addressable Memory (TCAM) to implement the flow tables. While TCAM can be used to implement very fast and powerful lookups, for instance to search on a range of values, unfortunately their write operations are quite slow. Furthermore, the implementation of flexible lookups may require the writing of more than one entry in the memory, in a precise order, sensibly increasing the installation time.
机译:SDN应用程序以新的方式操作交换硬件,从而揭示了当前交换设备的一些严格限制。大流量表条目的安装时间是这些限制之一,因为它限制了硬件SDN交换机的适用性,尤其是在需要反应式逻辑的那些应用程序中。这种性能限制的根源在于当前的ASIC采用的技术解决方案,这些解决方案通常依赖于三进制内容可寻址存储器(TCAM)来实现流表。尽管TCAM可用于实现非常快速和强大的查找(例如,在一系列值上进行搜索),但不幸的是,它们的写入操作非常慢。此外,灵活查找的实现可能需要以精确的顺​​序在内存中写入一个以上的条目,从而明显增加了安装时间。

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