Re: [RFC] PCI_IRQ_AFFINITY limits MSI-X allocation on 384 CPU / 1000+ NVMe system

[Keith Busch]

On Thu, Jul 30, 2026 at 09:44:21PM +0200, Thomas Gleixner wrote:
> On Thu, Jul 30 2026 at 07:28, Keith Busch wrote:
> > We can introduce a module parameter to throttle down the maximum number
> > of IO queues to allocate per controller. I don't think the driver can
> > automatically reason out what the correct number should be because it
> > doesn't know how many devices it's going to see.
> 
> I might be missing something here as usual, but the number of io queues
> per controller does not affect that at all as I explained before.

Oh, you did explain that. I skipped to the end as I had too many
distractions last week. Sorry about that, and thanks for the
re-explanation.

I mistakenly was thinking the effective_affinity was the only hardware
resource used. Back to the drawing board.