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Previous research indicates that packet reordering is not a rare event on some Internet paths. Reordering can cause performance problems for TCP's fast retransmission algorithm, which uses the arrival of duplicate acknowledgments to detect segment loss. Duplicate acknowledgments can be caused by the loss of a segment or by the reordering of segments by the(More)
Managed languages such as Java and C# are being considered for use in hard real-time systems. A hurdle to their widespread adoption is the lack of garbage collection algorithms that offer predictable space-and-time performance in the face of fragmentation. We introduce SCHISM/CMR, a new concurrent and real-time garbage collector that is fragmentation(More)
While managed languages such as C# and Java have become quite popular in enterprise computing, they are still considered unsuitable for hard real-time systems. In particular, the presence of garbage collection has been a sore point for their acceptance for low-level system programming tasks. Real-time extensions to these languages have the dubious(More)
In this paper we propose an architecture for using cross-organization information sharing to identify members of a group of hosts enslaved for malicious purposes on the Internet. We root our system in so-called " detectives " — savvy network monitors like sophisticated intrusion detection systems or honeyfarms that have a deep understanding of malicious(More)
This paper proposes a system for storing and sharing In-ternet measurement data amongst researchers. The Scal-able Internet Measurement Repository (SIMR) is centered around a database of measurements, tools, experiments, users and datasets. From this set of databases users can search for particular measurements, download the tools used to make and analyze(More)
In this note we explore the various causes of micro-bursting in TCP connections and also the behavior of several mitigations that have been suggested in the literature along with extensions we develop herein. This note methodically sketches the behavior of the mitigations and presents the tradeoffs of various schemes as a data point in the ongoing(More)
— Many network services such as voice, video, and collaborative applications require an informed view of network characteristics for effective operation. Sharing a network measurement service across multiple applications can significantly reduce measurement overhead, and remove the burden of performing network measurements from individual applications. To(More)
Predictable concurrency control is difficult. In this paper we present wait-free pair transactions, a lightweight, transactional communication object with the goal of achieving predictable communication between concurrent threads of execution, a key component to predictable concurrency control. Wait-free pair transactions allow entirely non-blocking, but(More)