http://hdl.handle.net/10900/124616 Sat, 03 Oct 2026 00:53:09 GMT 2026-10-03T00:53:09Z https://publikationen.uni-tuebingen.de:443/xmlui/bitstream/id/572ebe39-9ac1-4c08-ab6a-7cb6182e56df/ http://hdl.handle.net/10900/124616 http://hdl.handle.net/10900/126091 Are Kubernetes CNI solutions ready for >10 Gbit/s? Volpert, Simon; Eisenhart, Georg; Domaschka, Jörg The growth in variety of Container Network Interface (CNI) implementations as well as increasing Kubernetes adoption on bare metal require a thorough assessment of its performance characteristics. Specifically, the question whether CNI can saturate network links above 10 Gbit/s is of interest. This paper highlights an initial approach and central research questions towards the goal of this assessment. Therefore, we propose a method to acquire measurements that act as a groundwork for further investigations. Preliminary results show that a simple setup is not able to saturate even a 50 Gbit/s link. Thu, 07 Apr 2022 00:00:00 GMT http://hdl.handle.net/10900/126091 2022-04-07T00:00:00Z http://hdl.handle.net/10900/126087 P4-programmable Data Plane for Content-based Publish/Subscribe Wernecke, Christian; Parzyjegla, Helge; Mühl, Gero The domain-specific programming language P4 enables developers to specify how data plane devices (e.g., switches, routers) process packets. This opens up novel opportunities for efficient information dissemination at the network layer drastically reducing notification delays compared to applicationlayer publish/subscribe using broker overlay networks. In this paper, we present three different strategies that use P4 to realize content-based publish/subscribe. We start with a source routing strategy that is, then, improved to exploit and adapt a preinstalled forwarding tree by adding or removing branches if required. The most advanced strategy enables multiple forwarding trees to be dynamically stitched and adapted as needed. Thu, 07 Apr 2022 00:00:00 GMT http://hdl.handle.net/10900/126087 2022-04-07T00:00:00Z http://hdl.handle.net/10900/126082 A Simulation Model for Investigating Clock Synchronization Issues in Time-Sensitive Networks Danielis, Peter; Parzyjegla, Helge; Rashid, Yasir; Schweissguth, Eike; Mühl, Gero; Timmermann, Dirk The IEEE 802.1 Time-Sensitive Networking (TSN) task force has set guidelines for IEEE 802.3 networks allowing deterministic realtime communication over Ethernet. To execute deterministic time-triggered scheduling operations, the network nodes need to be synchronized. One application of time synchronization is distributed data acquisition for the Wendelstein 7-X nuclear fusion experiment. Both the system control and the scientific evaluation of the experiments need measurement timestamps with accuracies in the nanosecond range. The TSN standard IEEE 802.1AS has specified the generalized Precision Time Protocol (gPTP) which executes the synchronization process. However, there are some issues that are not addressed in the standard such as the impact of clock skew and drift of network nodes on the number of resynchronizations needed to maintain the required synchronization accuracy. This paper introduces an OMNeT++ simulation model, which can be used to investigate clock synchronization issues in time-sensitive networks. Thu, 07 Apr 2022 00:00:00 GMT http://hdl.handle.net/10900/126082 2022-04-07T00:00:00Z http://hdl.handle.net/10900/126081 Offloading SCION Packet Forwarding to XDP BPF Schulz, Lars-Christian; Hausheer, David Existing fixed-function packet processing hardware does not support novel protocols like the next-generation Internet architecture SCION. While SCION routers have previously been accelerated using DPDK and Tofino ASICs, we present an alternative lightweight but feature-complete approach based on the eXpress data path (XDP). We discuss implementation challenges and opportunities unique to the XDP BPF environment and demonstrate a first prototype capable of forwarding at least 0.676 million packets per second per CPU core. Thu, 07 Apr 2022 00:00:00 GMT http://hdl.handle.net/10900/126081 2022-04-07T00:00:00Z