On Tue, 3 Dec 2024 12:01:16 +0100 Alexander Lobakin wrote: > >> @ Jakub, > > > > Context? What doesn't work and why? > > My tests show the same perf as on Lorenzo's series, but I test with UDP > trafficgen. Daniel tests TCP and the results are much worse than with > Lorenzo's implementation. > I suspect this is related to that how NAPI performs flushes / decides > whether to repoll again or exit vs how kthread does that (even though I > also try to flush only every 64 frames or when the ring is empty). Or > maybe to that part of the kthread happens in process context outside any > softirq, while when using NAPI, the whole loop is inside RX softirq. > > Jesper said that he'd like to see cpumap still using own kthread, so > that its priority can be boosted separately from the backlog. That's why > we asked you whether it would be fine to have cpumap as threaded NAPI in > regards to all this :D Certainly not without a clear understanding what the problem with a kthread is.
