Android app is an important class of today’s Internet applications that generate roughly 40-50% of mobile Web and app traffic. More than 1.4 million Android apps are offered through Google’s open market and tens of thousands of new apps are added every month. However, very little information is known about their application protocol behaviors because ...

Datacenter applications like cloud storage need high bandwidth (40Gbps or more) to meet rising customer demand. Traditional TCP/IP (Transmission Control Protocol/Internet Protocol) stacks cannot be used at such speeds, since they have very high CPU (Central Processing Unit) overhead. The brutal economics of cloud services business dictates that CPU usage that cannot be monetized should ...

Legacy congestion controls including TCP and its variants are known to perform poorly over cellular networks due to highly variable capacities over short time scales, self-inflicted packet delays and packet losses unrelated to congestion. To cope with these challenges, the authors present Verus, an end-to-end congestion control protocol that uses delay measurements to react quickly ...

One-to-many group communication is common in modern data centers running cloud and web-based applications, or High Performance Computing (HPC) applications. In this paper, the authors propose FlyCast, an architecture using the physical layer of Free-Space Optics (FSO) to accelerate multicast communication. FlyCast leverages off-the-shelf devices (e.g. switchable mirror and beam splitter) to physically split the ...

In this paper, the authors challenge the applicability of entropy-based approaches for detecting and diagnosis network traffic anomalies and claim that full statistics (i.e., empirical probability distributions) should be applied to improve the change detection capabilities. They support their claim by detecting and diagnosing large-scale traffic anomalies in a real cellular network, caused by specific ...

In this paper, the authors present the design and implementation of SpotFi, an accurate indoor localization system that can be deployed on commodity Wi-Fi infrastructure. SpotFi only uses information that is already exposed by Wi-Fi chips and does not require any hardware or firmware changes, yet achieves the same accuracy as state-of-the-art localization systems. SpotFi ...

Datacenter operators rely on low-cost, high-density technologies to maximize throughput for data-intensive services with tight tail latencies. In-memory rack-scale computing is emerging as a promising paradigm in Scale-out datacenters capitalizing on Commodity SoC, low-latency and high bandwidth communication fabrics and a remote memory access model to enable aggregation of a rack’s memory for critical data-intensive ...

Traditional techniques for pipeline scheduling in high-level synthesis for FPGAs assume an additive delay model where each operation incurs a pre-characterized delay. While a good approximation for some operation types, this fails to consider technology mapping, where a group of logic operations can be mapped to a single Look-Up Table (LUT) and together incur one ...

The fairly recent explosion in the availability of reasonably fast wireless and mobile data networks has spurred demand for more capable mobile computing devices. Conversely, the emergence of new devices increases demand for better net-works, creating a virtuous cycle. The current concept of a smartphone as an always-connected computing device with multiple sensing modalities was ...

Multi-Version Concurrency Control (MVCC) is a widely employed concurrency control mechanism, as it allows for execution modes where readers never block writers. However, most systems implement only Snapshot Isolation (SI) instead of full serializability. Adding serializability guarantees to existing SI implementations tends to be prohibitively expensive. The authors present a novel MVCC implementation for main-memory ...