Ettikan Kandasamy Karuppiah

Performance Analysis and Optimization of User Space versus Kernel Space Network Application

Operating systems such as Linux cater to numerous network applications ranging from daemons that provide services namely HTTPd and SSHd to client programs that access these services. Traditionally, these programs are written in user space and use system calls to switch to the kernel so that operations such as establishing a socket, read or write can be executed. This paper discusses the alternative to the above method which is to implement these user space applications in the kernel. In this research, the performance of LDP implementations of server and client programs in the user space are compared to running them in the kernel space. It proofs the concept that implementing applications in the kernel space reduces the CPL load and enables slightly faster goodput rate due to lesser context-switching between the user and kernel space.

Organization of devices information in ontology representation to support service composition

Nowadays, with rapid development in networking technology, inter-device communication and controlling has getting easier. Existing technologies such as UPnP, Jini and HAVi address the device communication issue. However, there is still lack of a mechanism for organizing device information into useful inputs for service composition. Thus, we propose an ontology-based schema to support dynamic service composition and selection of networked devices. In our proposal, networked devices are organized in ontologies based on: (i) device’s functionality and (ii) device’s profile (e.g. device’s IP address, location and usage status). By referring to the ontologies, our system can determine the suitable devices that are capable to do certain task based on device’s functionality. Ontology also provides a shared understanding of device information to achieve interoperability of devices on the network. Proper classification of device information has significantly assist user’s decision in selecting appropriate device to perform desired service.

Service continuity for audio visual service

This paper presents a monitoring and handover mechanism which aims to minimize audio visual (AV) service disruption. Service discovery technology like UPnP has limited and inflexible fault tolerance feature. Our proposed monitoring and handover mechanism enhances the functionality of UPnP eventing. It consists of a Fault Analyzing Manager which proactively monitors changes of subscribed events and determines the possible occurrence of service failure. Compared with other existing service continuity architectures, our proposed architecture is able to perform autonomous recovery action based on action list and move away from single point of failure problem. Furthermore, it offers adaptive and proactive fault detection.

Effect of AV Traffic on UPNP Advertisements in a Home Network Environment

Universal plug and play (UPnP) is a widely accepted and most popular candidate for Consumer Electronics (CE) critical function of devices and services discovery, eventing, access and control at home network (HNet), The impact of bursty and high bandwidth audio video (AV) streaming in HNet which is to be the common scenario is not much explored. Timely UPnP message advertisements and delivery are critical to ensure actual device or service status is propagated to all users or devices in HNet for optimal user experience. Home CE devices are critical in terms of processing power and memory. It is also common to have display devices such as television to be the monitoring and control device for other tiny devices which are incapable of displaying information. Therefore, this paper aims to briefly analyze the challenges of HNet and study the impact of AV streaming on UPnP advertisements by running an AV client and an AV server in a Ethernet-based HNet for AV content streaming while multiple UPnP devices are simulated in the same network to understand further the effectiveness of the message delay. Selected messages from UPnP 1.0 specification were used for this purpose on the UPnP AV testbed