Re: [PATCH 2/2] nvme-pci: allow unmanaged interrupts

Ming Lei
2024-05-21T02:32:13Z

On Mon, May 20, 2024 at 05:37:42PM +0200, Christoph Hellwig wrote:
> On Sun, May 12, 2024 at 08:35:55AM +0200, Thomas Gleixner wrote:
> > That's expected as you pin the I/O operation on the isolated CPUs which
> > in turn makes them use the per CPU queue.
> >
> > The isolated CPUs are only excluded for device management interrupts,
> > but not for the affinity spread of the queues.
>
> We'll probably need a version of isolcpus that also excludes the
> interrupt spread given that users are asking for it. And I'd much
> prefer that over adding radom module options to every driver to disable
> managed interrupts.

BTW, isolcpus has been marked as deprecated, and it can't be adjust
runtime.

isolcpus= [KNL,SMP,ISOL] Isolate a given set of CPUs from disturbance.
[Deprecated - use cpusets instead]

Thanks,
Ming