1,721,077 research outputs found
Un pharmacien Niçois : Joseph-Antoine Risso : F. -E. Vayrolatti, in Pharmax, 1921, 1923
No full textGuitard Eugène-Humbert. Un pharmacien Niçois : Joseph-Antoine Risso : F. -E. Vayrolatti, in Pharmax, 1921, 1923. In: Bulletin de la Société d'histoire de la pharmacie, 13ᵉ année, n°46, 1925. p. 53
Un pharmacien Niçois : Joseph-Antoine Risso : F. -E. Vayrolatti, in Pharmax, 1921, 1923
No full textGuitard Eugène-Humbert. Un pharmacien Niçois : Joseph-Antoine Risso : F. -E. Vayrolatti, in Pharmax, 1921, 1923. In: Bulletin de la Société d'histoire de la pharmacie, 13ᵉ année, n°46, 1925. p. 53
Partial offloading of OpenFlow rules on a traditional hardware switch ASIC
No full textOpenFlow represents a new powerful paradigm that combines the flexibility of the software with the efficiency of a programmable hardware switch. However, such an approach is currently reserved for new hardware devices, specifically engineered for this paradigm. This paper presents our experience and findings about selectively offloading OpenFlow rules into a non-OpenFlow compatible hardware switch silicon, which enables existing (legacy) hardware ASICs to become compatible with the SDN paradigm. We describe our solution that transparently offloads the portion of OpenFlow rules supported by the hardware while keeping in software the remaining ones, and that is able to support the presence of multiple hardware tables although with limited capabilities in terms of matches and actions. Moreover, we illustrate the design choices used to implement all the basic functionalities required by the OpenFlow protocol (e.g., packet-in, packet-out messages) and then we demonstrate the considerable advantage in terms of performance that can be obtained by performing switching in hardware, while maintaining an SDN-type ability to program and to instantiate desired network operations from a central controlle
A proof-of-concept 5G mobile gateway with eBPF
Full text linkIn this poster we propose the first proof-of-concept open-source implementation of a 5G Mobile Gateway based on eBPF/XDP and present benchmarks that compare its performance with alternative technologies.
We show how it outperforms other in-kernel solutions (e.g., OvS) and is comparable with DPDK-based platforms
Measuring the cost of the Linux network stack in real-time
Full text linkAs network interfaces in the data center get faster and faster, and an increasingly big portion of the services is implemented in software, we must wonder just how much time our servers' CPUs are spending handling network traffic.
This paper explores the feasibility of measuring the cost of the entire in-kernel network stack in real-time on production systems by relying on the eBPF tracing capabilities instead of utilizing custom logic or kernel patching. We describe two methods that have been attempted, respectively based on an "exact" instrumentation of the stack and sampling, along with the advantages and defects of each approach
CrownLabs - A Collaborative Environment to Deliver Remote Computing Laboratories
Full text linkThe coronavirus pandemic hit the entire education sector hard. All students were sent home and lectures started to be delivered through video-conferencing systems. CrownLabs is an open-source project providing an answer to the problem of delivering remote computing laboratories. Simplicity is one of its main characteristics, requiring nothing but a simple web browser to interact with the system and being all heavyweight computations performed at the university premises. Cooperation and mentoring are also encouraged through parallel access to the same remote desktop. The entire system is built up using components from the Kubernetes ecosystem, to replicate a "cloud grade" infrastructure, coupled with custom software implementing the core business logic. To this end, most of the complexity has been delegated to the infrastructure, to speed up the development process and reduce the maintenance burden. An extensive evaluation has been performed in both real and simulated scenarios to validate the overall performance: the results are encouraging, as well as the feedback from the early adopters of the system
Providing Telco-oriented Network Services with eBPF: The Case for a 5G Mobile Gateway
Full text linkAlthough several technologies exist for high-speed data plane processing, such as DPDK, the above technologies require a rigid partitioning of the resources of the system, such as dedicated CPU cores and network interfaces. Unfortunately, this is not always possible when running at the edge of the network, in which a few servers are available in each cluster and a mixture of data and control plane services must coexist on the same hardware. In this respect, eBPF can become a better alternative thanks to its integration in the vanilla Linux kernel, which enables contemporary support for data and control plane services, hence enabling a more efficient usage of the (scarce) computing resources. This paper proposes the first proof-of-concept open-source implementation of a 5G Mobile Gateway based on eBPF/XDP, highlighting the possible challenges (e.g., to create traffic policers, as buffering is not available in eBPF) and the resulting architecture. The result is characterized in terms of performance and scalability and compared with alternative technologies, showing that it outperforms other in-kernel solutions (e.g., Open vSwitch) and is comparable with DPDK-based platforms
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The impact of Italian regionalisation on transporting neonatal patients back from the neonatal intensive care unit to the referring level two unit
No full text- …
