Characterizing the Deployment and Performance of Multi-CDNs
Characterizing the Deployment and Performance of Multi-CDNs
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DOI：
10.1145/3278532.3278548
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发表时间：
2018-10
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影响因子：
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通讯作者：
Rachee Singh;Arun Dunna;Phillipa Gill
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文献类型：
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作者：
Rachee Singh;Arun Dunna;Phillipa Gill
对软件供应商来说，向数以百万计的地理位置不同的客户推送软件更新是一个重要的技术挑战。在本文中，我们描述了内容交付网络（cdn）如何在3年的时间里用于交付两种主要操作系统（Windows和iOS）的软件更新。我们利用分布在206个国家的9000个RIPE Atlas客户端的DNS和ping测量数据集，了解使用多个cdn来提供操作系统更新的区域和时间趋势。我们对比了微软和苹果采用的两种相互竞争的发布操作系统更新的方法，其中大多数微软客户从他们当地的ISP下载Windows更新。但是，90%的苹果客户通过苹果自己的网络访问iOS更新。我们发现亚洲和非洲的客户在访问本地isp的边缘缓存内容时观察到的延迟大约改善了70毫秒。此外，微软还通过引导发展中地区的客户使用Akamai丰富的边缘缓存网络，为他们提供更低的延迟。我们还观察到，发展中地区的客户端从Level 3访问Windows更新，由于在这些地区没有Level 3的足迹，导致延迟较差。
Pushing software updates to millions of geographically diverse clients is an important technical challenge for software providers. In this paper, we characterize how content delivery networks (CDNs) are used to deliver software updates of two prominent operating systems (Windows and iOS), over a span of 3 years. We leverage a data set of DNS and ping measurements from 9,000 RIPE Atlas clients, distributed across 206 countries, to understand regional and temporal trends in the use of multiple CDNs for delivering OS updates. We contrast two competing methodologies for distributing OS updates employed by Microsoft and Apple, where the majority of Microsoft clients download Windows updates from their local ISP. But, 90% of Apple clients access iOS updates from Apple's own network. We find an approximate improvement of 70 ms in the latency observed by clients in Asia and Africa when accessing content from edge caches in local ISPs. Additionally, Microsoft provides lower latencies to its clients in developing regions by directing them to Akamai's rich network of edge caches. We also observe that clients in developing regions accessing Windows updates from Level 3 get poor latencies arising from the absence of Level 3's footprint in those regions.