Browsing by Author "Crovella, Mark"

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Browsing by Author "Crovella, Mark"

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  • Analysis of OD Flows (Raw Data)
    Lakhina, Anukool; Papagiannaki, Konstantina; Crovella, Mark; Diot, Christophe; Kolaczyk, Eric D.; Taft, Nina (Boston University Computer Science Department, 2003-11-20)
    In a recent paper, Structural Analysis of Network Traffic Flows, we analyzed the set of Origin Destination traffic flows from the Sprint-Europe and Abilene backbone networks. This report presents the complete set of results ...
  • Bayesian Packet Loss Detection for TCP
    Fonseca, Nahur; Crovella, Mark (Boston University Computer Science Department, 2004-07-06)
    One of TCP's critical tasks is to determine which packets are lost in the network, as a basis for control actions (flow control and packet retransmission). Modern TCP implementations use two mechanisms: timeout, and fast ...
  • BU/NSF Workshop on Internet Measurement, Instrumentation and Characterization
    Govindan, Ramesh; Jamin, Sugih; Zekauskas, Matt; Willinger, Walter; Towsley, Don; Pitkow, Jim; Ammar, Mostafa; Padmanabhan, Venkata; Bharghavan, Vaduvur; Schulzrinne, Henning; Rajagopalan, Bala; Zinky, John (Boston University Computer Science Department, 1999-12-15)
  • Changes in Web Client Access Patterns: Characteristics and Caching Implications
    Barford, Paul; Bestavros, Azer; Bradley, Adam; Crovella, Mark (Boston University Computer Science Department, 1998-12-04)
    Understanding the nature of the workloads and system demands created by users of the World Wide Web is crucial to properly designing and provisioning Web services. Previous measurements of Web client workloads have been ...
  • Characterization of Network-Wide Anomalies in Traffic Flows
    Lakhina, Anukool; Crovella, Mark; Diot, Christophe (Boston University Computer Science Department, 2004-05-19)
    Detecting and understanding anomalies in IP networks is an open and ill-defined problem. Toward this end, we have recently proposed the subspace method for anomaly diagnosis. In this paper we present the first large-scale ...
  • Characterizing Reference Locality in the WWW
    Almeida, Virgílio; Bestavros, Azer; Crovella, Mark; de Oliveira, Adriana (Boston University Computer Science Department, 1996-06-21)
    As the World Wide Web (Web) is increasingly adopted as the infrastructure for large-scale distributed information systems, issues of performance modeling become ever more critical. In particular, locality of reference is ...
  • Corrections to "How Does TCP Generate Pseudo-Self-Similarity?"
    Guo, Liang; Crovella, Mark; Matta, Ibrahim (Boston University Computer Science Department, 2001)
  • Describing and Forecasting Video Access Patterns
    Gursun, Gonca; Crovella, Mark; Matta, Ibrahim (CS Department, Boston University, 2010-11-10)
    Computer systems are increasingly driven by workloads that reflect large-scale social behavior, such as rapid changes in the popularity of media items like videos. Capacity planners and system designers must plan for rapid, ...
  • Diagnosing Network-Wide Traffic Anomalies
    Lakhina, Anukool; Crovella, Mark; Diot, Christophe (Boston University Computer Science Department, 2004-02-24)
    Anomalies are unusual and significant changes in a network's traffic levels, which can often involve multiple links. Diagnosing anomalies is critical for both network operators and end users. It is a difficult problem ...
  • Distributed Packet Rewriting and its Application to Scalable Server Architectures
    Bestavros, Azer; Crovella, Mark; Liu, Jun; Martin, David (Boston University Computer Science Department, 1998-02-01)
    To construct high performance Web servers, system builders are increasingly turning to distributed designs. An important challenge that arises in distributed Web servers is the need to direct incoming connections to ...
  • Diversity of Forwarding Paths in Pocket Switched Networks
    Erramilli, Vijay; Chaintreau, Augustin; Crovella, Mark; Diot, Christophe (Boston University Computer Science Department, 2007)
    Forwarding in DTNs is a challenging problem. We focus on the specific issue of forwarding in an environment where mobile devices are carried by people in a restricted physical space (e.g. a conference) and contact patterns ...
  • End-to-End Inference of Loss Nature in a Hybrid Wired/Wireless Environment
    Liu, Jun; Matta, Ibrahim; Crovella, Mark (Boston University Computer Science Department, 2002-03-14)
    End-to-End differentiation between wireless and congestion loss can equip TCP control so it operates effectively in a hybrid wired/wireless environment. Our approach integrates two techniques: packet loss pairs (PLP) and ...
  • Extracting Location from Contact Traces
    Vasconcelos, Marisa; Crovella, Mark (Boston University Computer Science Department, 2008-09-11)
    Localization is essential feature for many mobile wireless applications. Data collected from applications such as environmental monitoring, package tracking or position tracking has no meaning without knowing the location ...
  • Generating Representative Web Workloads for Network and Server Performance Evaluation
    Barford, Paul; Crovella, Mark (Boston University Computer Science Department, 1997-12-31)
    One role for workload generation is as a means for understanding how servers and networks respond to variation in load. This enables management and capacity planning based on current and projected usage. This paper applies ...
  • Graph Wavelets for Spatial Traffic Analysis
    Crovella, Mark; Kolaczyk, Eric (Boston University Computer Science Department, 2002-07-15)
    A number of problems in network operations and engineering call for new methods of traffic analysis. While most existing traffic analysis methods are fundamentally temporal, there is a clear need for the analysis of traffic ...
  • How does TCP generate Pseudo-self-similarity?
    Guo, Liang; Crovella, Mark; Matta, Ibrahim (Boston University Computer Science Department, 2001)
    Long-range dependence has been observed in many recent Internet traffic measurements. In addition, some recent studies have shown that under certain network conditions, TCP itself can produce traffic that exhibits dependence ...
  • An Independent-Connection Model for Traffic Matrices
    Erramilli, Vijay; Crovella, Mark; Taft, Nina (Boston University Computer Science Department, 2006-09-06)
    A common assumption made in traffic matrix (TM) modeling and estimation is independence of a packet's network ingress and egress. We argue that in real IP networks, this assumption should not and does not hold. The fact ...
  • Measuring Web Performance in the Wide Area
    Barford, Paul; Crovella, Mark (Boston University Computer Science Department, 1999-04-23)
    One of the most vexing questions facing researchers interested in the World Wide Web is why users often experience long delays in document retrieval. The Internet's size, complexity, and continued growth make this a difficult ...
  • The Network Effects of Prefetching
    Crovella, Mark; Barford, Paul (Boston University Computer Science Department, 1997-07-10)
    Prefetching has been shown to be an effective technique for reducing user perceived latency in distributed systems. In this paper we show that even when prefetching adds no extra traffic to the network, it can have serious ...
  • On the Emergence of Highly Variable Distributions in the Autonomous System Topology
    Fayed, Marwan; Krapivsky, Paul; Byers, John; Finkel, David; Redner, Sid; Crovella, Mark (Boston University Computer Science Department, 2003-03-01)
    Recent studies have noted that vertex degree in the autonomous system (AS) graph exhibits a highly variable distribution [15, 22]. The most prominent explanatory model for this phenomenon is the Barabási-Albert (B-A) model ...