On Wed, 30 Sep 2020 12:21:35 -0700 Wei Wang wrote: > With napi poll moved to kthread, scheduler is in charge of scheduling both > the kthreads handling network load, and the user threads, and is able to > make better decisions. In the previous benchmark, if we do this and we > pin the kthreads processing napi poll to specific CPUs, scheduler is > able to schedule user threads away from these CPUs automatically. > > And the reason we prefer 1 kthread per napi, instead of 1 workqueue > entity per host, is that kthread is more configurable than workqueue, > and we could leverage existing tuning tools for threads, like taskset, > chrt, etc to tune scheduling class and cpu set, etc. Another reason is > if we eventually want to provide busy poll feature using kernel threads > for napi poll, kthread seems to be more suitable than workqueue.
As I said in my reply to the RFC I see better performance with the workqueue implementation, so I would hold off until we have more conclusive results there, as this set adds fairly strong uAPI that we'll have to support for ever.
