On Tue, Sep 29, 2020 at 11:24:49AM -0700, Sagi Grimberg wrote: > Yes, basically usage of managed affinity caused people to report > regressions not being able to change irq affinity from procfs.
Well, why would they change it? The whole point of the infrastructure is that there is a single sane affinity setting for a given setup. Now that setting needed some refinement from the original series (e.g. the current series about only using housekeeping cpus if cpu isolation is in use). But allowing random users to modify affinity is just a receipe for a trainwreck. So I think we need to bring this back ASAP, as doing affinity right out of the box is an absolute requirement for sane performance without all the benchmarketing deep magic.
