The measured performance of content distribution networks

被引：37

作者：

Johnson, KL ^{[1
]}

Carr, JF ^{[1
]}

Day, MS ^{[1
]}

Kaashoek, MF ^{[1
]}

机构：

[1] Cisco Syst Inc, Waltham, MA 02452 USA

来源：

COMPUTER COMMUNICATIONS | 2001年 / 24卷 / 02期

关键词：

content distribution network; Akamai; Digital Island;

D O I：

10.1016/S0140-3664(00)00315-7

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

We have measured the performance of two commercial content distribution networks (CDNs), one operated by Akamai and one operated by Digital Island. Although there are differences in the implementation of these services, both CDNs redirect requests by using DNS. In this paper, we describe our simple measurement technique for a DNS-based CDN, our data for the two commercial services, and our interpretation of that data. Our main conclusion is that CDNs provide a valuable service, but that neither Akamai nor Digital Island can consistently pick the best server of those available. Contrary to some widely disseminated marketing messages, we argue that CDNs succeed not so much by choosing an "optimal" server as by avoiding notably bad servers. (C) 2001 Published by Elsevier Science B.V.

引用

页码：202 / 206

页数：5