| 1. |
- Roozbeh, Amir, 1983-, et al.
(författare)
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Software-Defined "Hardware" Infrastructures : A Survey on Enabling Technologies and Open Research Directions
- 2018
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Ingår i: IEEE Communications Surveys and Tutorials. - : Institute of Electrical and Electronics Engineers (IEEE). - 1553-877X. ; 20:3, s. 2454-2485
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Tidskriftsartikel (refereegranskat)abstract
- This paper provides an overview of software-defined "hardware" infrastructures (SDHI). SDHI builds upon the concept of hardware (HW) resource disaggregation. HW resource disaggregation breaks today's physical server-oriented model where the use of a physical resource (e.g., processor or memory) is constrained to a physical server's chassis. SDHI extends the definition of of software-defined infrastructures (SDI) and brings greater modularity, flexibility, and extensibility to cloud infrastructures, thus allowing cloud operators to employ resources more efficiently and allowing applications not to be bounded by the physical infrastructure's layout. This paper aims to be an initial introduction to SDHI and its associated technological advancements. This paper starts with an overview of the cloud domain and puts into perspective some of the most prominent efforts in the area. Then, it presents a set of differentiating use-cases that SDHI enables. Next, we state the fundamentals behind SDI and SDHI, and elaborate why SDHI is of great interest today. Moreover, it provides an overview of the functional architecture of a cloud built on SDHI, exploring how the impact of this transformation goes far beyond the cloud infrastructure level in its impact on platforms, execution environments, and applications. Finally, an in-depth assessment is made of the technologies behind SDHI, the impact of these technologies, and the associated challenges and potential future directions of SDHI.
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| 2. |
- Turull, Daniel, et al.
(författare)
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Evaluating OpenFlow in libNetVirt
- 2012
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Ingår i: The 8th Swedish National Computer Networking Workshop 2012 (SNCNW 2012).
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Konferensbidrag (refereegranskat)abstract
- LibNetVirt, the library presented and evaluated here, proposes an architecture for a network virtualization abstraction. Network virtualization has been an important research topic for many years but still suffers from the lack of an abstraction level like the one present in virtualization of computing and storage. LibNetVirt is deployed as a library, similar to libvirt in computer virtualization, with a unified interface towards the underlying network specific drivers. The architecture allows management tools to be independent of the underlying technologies. In addition, it enables programmatic and on-demand creation of virtual networks. We have evaluated libNetVirt in an OpenFlow-enabled network in three different tests: the setup time of a flow, the behavior of the system under a Denial of Service attack and the packet losses in high rate UDP flows.
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| 3. |
- Turull, Daniel, et al.
(författare)
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libNetVirt : The network virtualization library
- 2012
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Ingår i: 2012 IEEE International Conference on Communications (ICC). - : IEEE conference proceedings. - 9781457720536 ; , s. 5543-5547
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Konferensbidrag (refereegranskat)abstract
- Network virtualization has been an important research topic for many years but still suffers from the lack of an abstraction level like the one present in virtualization of computing and storage. Our work in progress presented here proposes an architecture for such a network virtualization abstraction. It is deployed as a library, similar to libvirt in computer virtualization, with a unified interface towards the underlying network specific drivers. The architecture will allow management tools to be independent of the underlying technologies. In addition, it will enable programmatic and on-demand creation of virtual networks. A common set of calls is defined to instantiate different virtual networks, using a single node view to provide the user with a suitable abstraction of the network. We describe a prototype of our proposed architecture on top of an OpenFlow-enabled network. We demonstrate its feasibility for creating isolated virtual networks in a programmatic and on demand fashion.
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| 4. |
- Turull, Daniel
(författare)
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Network virtualization as enabler for cloud networking
- 2016
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The Internet has exponentially grown and now it is part of our everyday life. Internet services and applications rely on back-end servers that are deployed on local servers and data centers. With the growing use of data centers and cloud computing, the locations of these servers have been externalized and centralized, taking advantage of economies of scale.However, some applications need to define complex network topologies and require more than simple connectivity to the remote sites. Therefore, the network part of cloud computing, what is called cloud networking, needs to be improved and simplified.This thesis argues that network virtualization permits to fill the missing gap and we propose a network virtualization abstraction layer to ease the use of cloud networking for the end users. We implement a software prototype of our ideas using OpenFlow. We also evaluate our prototype with state of the art controllers that has similar functionalities for network virtualization.A second part of this thesis focuses on developing a tool for performance testing. We have improved the widely used tool pktgen with receiver functionalities. We use pktgen to generate traffic for our experiments with network virtualization.
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| 5. |
- Turull, Daniel, et al.
(författare)
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Performance evaluation of openflow controllers for network virtualization
- 2014
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Ingår i: High Performance Switching and Routing (HPSR), 2014 IEEE 15th International Conference on. - : IEEE conference proceedings. ; , s. 50-56
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Konferensbidrag (refereegranskat)abstract
- This paper investigates OpenFlow performance, focusing on how the delay between switch and OpenFlow controller can impact the performance of a network. We use open-source controllers that support network virtualization to evaluate how such delay impacts ICMP, TCP and UDP traffic. We compare the controllers’ flow set-up strategies and we conduct several experiments to compare their TCP and UDP performance. In ad-dition, we introduce a new metric to measure UDP packet losses at the beginning of the flow. The results of the measurements indicate that there are large differences in performance between controllers, and that performance depends on switch-controller delay and flow set-up strategy.
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| 6. |
- Turull, Daniel, et al.
(författare)
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Pktgen : Measuring performance on high speed networks
- 2016
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Ingår i: Computer Communications. - : Elsevier. - 0140-3664 .- 1873-703X. ; 82, s. 39-48
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Tidskriftsartikel (refereegranskat)abstract
- Abstract Pktgen is a tool for high-speed packet generation and testing. It runs in the Linux kernel, and is designed to accommodate a wide range of network performance tests. Pktgen consists of a packet generator, a receiver, and a protocol that defines the format for test packets. This paper describes the design of pktgen, and discusses its usage as a capable performance testing tool. The design is focused on performance, and in order to generate packets at high packet rate, pktgen takes advantage of multicore systems and multi-queue features on modern network cards. To support realistic heterogeneous traffic patterns, pktgen can generate multiple simultaneous UDP flows. Pktgen supports measurements of throughput, latency, packet inter-arrival time, and packet delay variation with a wide-range of fine-grained user specified rates. We evaluate and compare pktgen to other tools, and show that it is more than an order of magnitude faster than current Linux applications such as Iperf and Netperf, and has the same upper limit on performance as special-purpose high-speed tools, such as DPDK and Netmap, when it comes to throughput measurements with user-specified rate.
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| 7. |
- Turull, Daniel, et al.
(författare)
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Using libNetVirt to control the virtual network
- 2012
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Ingår i: 2012 IEEE 1st International Conference on Cloud Networking (CLOUDNET) (IEEE CloudNet’12). - : IEEE conference proceedings. ; , s. 148-152
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Konferensbidrag (refereegranskat)abstract
- LibNetVirt proposes an architecture for a network virtualization abstraction using the single node representation model. LibNetVirt is deployed as a library, similar to libvirt in computer virtualization, with a unified interface towards the underlying network specific drivers. The architecture allows management tools to be independent of the underlying technologies. In addition, it enables programmatic and on-demand creation of virtual networks. We have evaluated libNetVirt in an OpenFlow-enabled network in three different tests: the setup time of a flow, the behavior of the system under a Denial of Service attack and the packet losses in high rate UDP flows.
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