38,189 research outputs found
Fast Packet-drop Analysis and Network Self-Recovery
For large networks, e.g., that include hundreds of thousands to millions of network devices, the event of a packet drop somewhere in the network is fairly frequent. Packet drops can result in data loss. Analyzing and recovering from packet drops is currently a time-consuming process. This disclosure describes techniques that incorporate packet-drop intelligence into network devices, such that debugging and root-cause analysis of packet drops is made thorough, efficient, and real-time. A debugging engine is incorporated into a network device such as a switch and runs as part of the switch operating system. The engine leverages the device hardware to perform various counter collections, trap network flows, collect debugging data, inject debug packets, etc. The techniques enable efficient and economic debugging of network issues such as connectivity problems, control-plane protocol time-outs, memory errors, hardware failures, congestion drops, etc
Open-TEE - An Open Virtual Trusted Execution Environment
Hardware-based Trusted Execution Environments (TEEs) are widely deployed in
mobile devices. Yet their use has been limited primarily to applications
developed by the device vendors. Recent standardization of TEE interfaces by
GlobalPlatform (GP) promises to partially address this problem by enabling
GP-compliant trusted applications to run on TEEs from different vendors.
Nevertheless ordinary developers wishing to develop trusted applications face
significant challenges. Access to hardware TEE interfaces are difficult to
obtain without support from vendors. Tools and software needed to develop and
debug trusted applications may be expensive or non-existent.
In this paper, we describe Open-TEE, a virtual, hardware-independent TEE
implemented in software. Open-TEE conforms to GP specifications. It allows
developers to develop and debug trusted applications with the same tools they
use for developing software in general. Once a trusted application is fully
debugged, it can be compiled for any actual hardware TEE. Through performance
measurements and a user study we demonstrate that Open-TEE is efficient and
easy to use. We have made Open- TEE freely available as open source.Comment: Author's version of article to appear in 14th IEEE International
Conference on Trust, Security and Privacy in Computing and Communications,
TrustCom 2015, Helsinki, Finland, August 20-22, 201
Setting the stage – embodied and spatial dimensions in emerging programming practices.
In the design of interactive systems, developers sometimes need to engage in various ways of physical
performance in order to communicate ideas and to test out properties of the system to be realised. External
resources such as sketches, as well as bodily action, often play important parts in such processes, and
several methods and tools that explicitly address such aspects of interaction design have recently been
developed. This combined with the growing range of pervasive, ubiquitous, and tangible technologies
add up to a complex web of physicality within the practice of designing interactive systems. We illustrate
this dimension of systems development through three cases which in different ways address the design
of systems where embodied performance is important. The first case shows how building a physical sport
simulator emphasises a shift in activity between programming and debugging. The second case shows a
build-once run-once scenario, where the fine-tuning and control of the run-time activity gets turned into
an act of in situ performance by the programmers. The third example illustrates the explorative and experiential
nature of programming and debugging systems for specialised and autonomous interaction
devices. This multitude in approaches in existing programming settings reveals an expanded perspective
of what practices of interaction design consist of, emphasising the interlinking between design, programming,
and performance with the system that is being developed
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