On Fri, May 09, 2025 at 10:04:18AM +0800, Ming Lei wrote: > > io_queue > > Isolate from IO queue work caused by multiqueue > > device drivers. Restrict the placement of > > queues to housekeeping CPUs only, ensuring that > > all IO work is processed by a housekeeping CPU. > > > > Note: When an isolated CPU issues an IO, it is > > forwarded to a housekeeping CPU. This will > > trigger a software interrupt on the completion > > path. > > > > Note: It is not possible to offline housekeeping > > CPUs that serve isolated CPUs. > > This patch adds kernel parameter only, but not apply it at all, the above > words just confuses everyone, so I'd suggest to not expose the kernel > command line & document until the whole mechanism is supported. I'll add this doc update as last patch. > Especially 'irqaffinity=0 isolcpus=io_queue' requires the application > to offline CPU in order, which has to be documented: > > https://lore.kernel.org/all/cc5e44dd-e1dc-4f24-88d9-ce45a8b0794f@flourine.local/ Okay, so you want me to extend the above second note in this case. I'll give it a go.
