On Fri, May 09, 2025 at 09:47:31AM +0800, Ming Lei wrote: > On Thu, Apr 24, 2025 at 08:19:42PM +0200, Daniel Wagner wrote: > > Multiqueue devices should only allocate queues for the housekeeping CPUs > > when isolcpus=io_queue is set. This avoids that the isolated CPUs get > > disturbed with OS workload. > > The commit log needs to be updated: > > - io_queue isn't introduced yet > > - this patch can only reduce nr_hw_queues, and queue mapping isn't changed > yet, so nothing to do with > > "This avoids that the isolated CPUs get disturbed with OS workload"
What about: The calculation of the upper limit for queues does not depend solely on the number of possible CPUs; for example, the isolcpus kernel command-line option must also be considered. To account for this, the block layer provides a helper function to retrieve the maximum number of queues. Use it to set an appropriate upper queue number limit. I would use this version for the other patches as well, s/possible/online/ where necessary.
