indeed, but afaik these more or less depend on dedicating a cpu-thread to the software-thread because a cache eviction would completely wreck the performance
I think with networking appliances that are built from eg DPDK building blocks the main motivation for pinning and isolcpus usage is largely that users want to have a fixed topology of CPU cores, PCIe devices, NUMA memory pools/hugepages. But this doesn't really mean it would be necessary if we started using userspace networking drivers for general purpouse linux workloads.