Measure and Optimize TCP Split for Cloud Services
Under submission.... Will update in future :-)
Under submission.... Will update in future :-)
Loss rate measurement between arbitrary Internet hosts
We present a new methodology, Queen, for estimating pakcet-loss rates between arbitrary Internet hosts. Queen, extending the King methodology for estimating delay, takes advantage of the open recursive DNS name servers. It requires neither additional infrastructure deployment nor control of the DNS recursive servers. We perform an extensive measurement validation of Queen's accuracy. Our validation shows that Queen's accuracy is reasonably high.
With Queen, we conduct a loss rate measurement for a large geographic area with world-wide coverage.
We quantify the potential gains of hybrid CDN-P2P for two of the leading CDN companies, Akamai and Limelight. We develop novel measurement methodology for mapping the topologies of CDN networks. We then consider ISP-friendly P2P distribution schemes which work in conjunction with the CDNs to localize traffic within regions of ISPs. We use two real-world traces: a video-on-demand trace and a large-scale software update trace, to evaluate these schemes. We find that hybrid CDN-P2P can significantly reduce the cost of content distribution, even when peer sharing is localized within ISPs and further localized within regions of ISPs. Hybrid CDN-P2P distribution can economically satisfy the exponential growth of Internet video content without placing an unacceptable burden on regional ISPs.
Data center location selection
We conduct extensive and thorough measurements that accurately characterize the performance of two large-scale CDNs. Our measurements include charting the CDNs (locating all their content and DNS servers), assessing their server availability, and quantifying their world-wide delay performance. Our measurement techniques can be adopted by CDN customers to independently evaluate the performance of CDN vendors. It can also be used by a new CDN entrant to choose an approciate CDN design and to locate its servers.
Bases on the measurements, we shed light on two radically different design philosophies for CDNs: one that enters deep into ISPs and one that brings ISPs to home. We choose an example for each design and comapre them with regards to the number of their content servers, their internal DNS designs, the geographic locations of their data centers, and their DNS and content server delays.
Relay discovery and selection in large P2P network
Peer-to-peer overlays can be used for service discovery over a global network fabric. We describe and evaluate a new service indexing mechanism for in-band streaming services such as application relays, mixers, and media transcoders. For this type of service, the location of the service in the network and service admission status are key attributes. We describe and analyze a service indexing mechanism which uses network position-based advertisement. We show that this mechamism gives good service selection, provides a close to uniform advertisement distribution in the overlay, reduces message overhead, and exhibits acceptable stability and setup delay.
We investigate different relay selection schemes to compare the selection overhead.