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

[Ming Lei]

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