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首页> 外文期刊>IEEE Transactions on Parallel and Distributed Systems >BitTorrent Locality and Transit TrafficReduction: When, Why, and at What Cost?
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BitTorrent Locality and Transit TrafficReduction: When, Why, and at What Cost?

机译：BitTorrent本地性和减少过境流量：何时，为什么以及以什么成本付费？

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摘要

A substantial amount of work has recently gone into localizing BitTorrent traffic within an ISP in order to avoid excessive and often times unnecessary transit costs. Several architectures and systems have been proposed and the initial results from specific ISPs and a few torrents have been encouraging. In this work we attempt to deepen and scale our understanding of locality and its potential. Looking at specific ISPs, we consider tens of thousands of concurrent torrents, and thus capture ISP-wide implications that cannot be appreciated by looking at only a handful of torrents. Second, we go beyond individual case studies and present results for few thousands ISPs represented in our data set of up to 40K torrents involving more than 3.9M concurrent peers and more than 20M in the course of a day spread in 11K ASes. Finally, we develop scalable methodologies that allow us to process this huge data set and derive accurate traffic matrices of torrents. Using the previous methods we obtain the following main findings: i) Although there are a large number of very small ISPs without enough resources for localizing traffic, by analyzing the 100 largest ISPs we show that Locality policies are expected to significantly reduce the transit traffic with respect to the default random overlay construction method in these ISPs; ii) contrary to the popular belief, increasing the access speed of the clients of an ISP does not necessarily help to localize more traffic; iii) by studying several real ISPs, we have shown that soft speed-aware locality policies guarantee win-win situations for ISPs and end users. Furthermore, the maximum transit traffic savings that an ISP can achieve without limiting the number of inter-ISP overlay links is bounded by “unlocalizable” torrents with few local clients. The application of restrictions in the number of inter-ISP links leads to a higher transit traffic reduction but the QoS of clients downloading “unlocalizable&x201-; ; torrents would be severely harmed.
机译：最近，大量工作已投入到在ISP内对BitTorrent流量进行本地化的工作，以避免过多的（通常是不必要的）不必要的传输成本。已经提出了几种架构和系统，来自特定ISP和一些种子的初步结果令人鼓舞。在这项工作中，我们试图加深和扩大对当地及其潜力的了解。通过查看特定的ISP，我们考虑了成千上万个并发的torrent，因此捕获了整个ISP范围的含义，仅通过查看少量的torrent就无法理解。其次，我们不仅仅进行个案研究，而且还提供了数千个ISP的结果，这些数据在我们的数据集中代表了多达40,000个torrent，涉及超过390万个并发对等端，每天传播超过1千万个AS中的2000万个。最终，我们开发了可扩展的方法，使我们能够处理这一庞大的数据集并得出准确的洪流流量矩阵。使用以前的方法，我们得出以下主要发现：i）尽管有很多非常小的ISP，而没有足够的资源来对流量进行本地化，但通过分析100个最大的ISP，我们表明，区域性政策有望大大减少遵守这些ISP中默认的随机覆盖构建方法； ii）与普遍看法相反，提高ISP客户端的访问速度并不一定有助于本地化更多流量； iii）通过研究几个真实的ISP，我们已经表明，了解速度的软性本地策略可确保ISP和最终用户双赢。此外，ISP可以在不限制ISP间覆盖链接数量的情况下实现的最大传输流量节省受限于本地客户端很少的“无法本地化”的洪流。 ISP间链接数量的限制的应用导致更高的传输流量减少，但客户端下载“ unlocalizable＆x201-; ;激流将受到严重伤害。

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