Tiziana Refice
Tiziana received a Master's Degree in computer engineering at Roma Tre University in 2005 and a Ph.D. in networking at the same university in 2008 with a thesis on root cause analysis in inter-domain routing. She has worked as research engineer at the RIPE NCC on analysis of registration and routing data. She is currently working on Internet performance measurement.
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An Argument for Increasing TCP's Initial Congestion Window
Jerry Chu
Tom Herbert
Amit Agarwal
Arvind Jain
Natalia Sutin
ACM SIGCOMM Computer Communications Review, vol. 40 (2010), pp. 27-33
Preview abstract
TCP flows start with an initial congestion window of at most four segments or approximately 4KB of data. Because most Web transactions are short-lived, the initial congestion window is a critical TCP parameter in determining how quickly flows can finish. While the global network access speeds increased dramatically on average in the past decade, the standard value of TCP’s initial congestion window has remained unchanged.
In this paper, we propose to increase TCP’s initial congestion window to at least ten segments (about 15KB). Through large-scale Internet experiments, we quantify the latency benefits and costs of using a larger window, as functions of network bandwidth, round-trip time (RTT), bandwidthdelay product (BDP), and nature of applications. We show that the average latency of HTTP responses improved by approximately 10% with the largest benefits being demonstrated in high RTT and BDP networks. The latency of low bandwidth networks also improved by a significant amount in our experiments. The average retransmission rate increased by a modest 0.5%, with most of the increase coming from applications that effectively circumvent TCP’s slow start algorithm by using multiple concurrent connections. Based on the results from our experiments, we believe the initial congestion window should be at least ten segments and the same be investigated for standardization by the IETF.
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Preview abstract
As IPv4 address space approaches exhaustion, large networks are deploying IPv6 or preparing for deployment. However, there is little data available about the quantity and quality of IPv6 connectivity. We describe a methodology to measure IPv6 adoption from the perspective of a Web site operator and to evaluate the impact that adding IPv6 to a Web site will have on its users. We apply our methodology to the Google Web site and present results collected over the last year. Our data show that IPv6 adoption, while growing significantly, is still low, varies considerably by country, and is heavily influenced by a small number of
large deployments. We find that native IPv6 latency is comparable to IPv4 and provide statistics on IPv6 transition mechanisms used.
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Access and Analyze Broadband Measurements Collected using M-Lab
Summer 2010 ESCC/Internet2 Joint Techs
Preview abstract
Measurement Lab (M-Lab) is an open, distributed server platform for researchers, to deploy Internet measurement tools. Everybody can use M-Lab's tools to measure their own broadband connection performance. The M-Lab servers collect logs of all the users' tests and make them publicly available. As of July 2010, users have run millions of tests that have generated many terabytes of measurement data.
This talk will present the public repositories of M-Lab data and will explain how to analyze M-Lab data using Google's BigQuery. BigQuery stores M-Lab's measurements logs in a table with more than 60 billions of rows. It takes less than 1 minute to run a query against the whole dataset.
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Measuring Route Diversity in the Internet from Remote Vantage Points
Andrea Di Menna
Luca Cittadini
Giuseppe Di Battista
Proc. International Conference on Networks (ICN 2009)
YouTube Hijacking (February 24th 2008) Analysis of BGP Routing Dynamics
Antony Antony
Daniel Karrenberg
Robert Kisteleki
Rene Wilhelm
Dept. of Computer Science and Automation, University of Roma Tre (2008)
Measuring and Visualizing Interdomain Routing Dynamics with BGPath
Luca Cittadini
Alessio Campisano
Giuseppe Di Battista
Claudio Sasso
IEEE Symposium on Computers and Communications (ISCC 2008)
Tracking Back the Root Cause of a Path Change in Interdomain Routing
Alessio Campisano
Luca Cittadini
Giuseppe Di Battista
Claudio Sasso
IEEE/IFIP Network Operations and Management Symposium (NOMS 2008)
Mediterranean Fiber Cable Cut (January-February 2008) Analysis of Network Dynamics
Antony Antony
Luca Cittadini
Daniel Karrenberg
Robert Kisteleki
Tom Vest
Rene Wilhelm
Dept. of Computer Science and Automation, University of Roma Tre. (2008)
A Study of Internet Routing Stability Using Link Weight
Mohit Lad
Jonathan Park
Lixia Zhang
Computer Science Department, University of California Los Angeles (2008)
How to Extract BGP Peering Information from the Internet Routing Registry
