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In a recent blog post, Alban Crequy and Mauricio Vásquez benchmarked egress filtering solutions in the Linux kernel and compared iptables, ipsets, and BPF at the tc hook. That is exciting, not only because egress benchmarks are missing with everyone focusing on ingress (e.g., XDP), but also because they: included short CPU traces, allowing us to understand what is happening. provided the code and ran it on Packet machines, allowing anyone to easily reproduce results.
IO and multiprotocol processing in highly demanding embedded architectures
By Vincent Laporte, CTO, Cetrac.io
IO and network management are faced with increasing speed requirements
Low physical I/O protocols or device management have always been handled by a hardware device, simply because line survey or reaction to a bus change need very short reaction time. It would require a huge amount of processing power in order to be fast enough to comply with the bus management physical and timing requirements.
But once the physical layer has been handled by these components, it can still be up to a processor to undertake data handling and low-level protocol management.