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

[Keith Busch]

On Thu, Jul 30, 2026 at 03:16:46PM +0200, Thomas Gleixner wrote:
> As I told you before it's simple math and resource exhaustion due to the
> way how NVME is implemented and the x86 vector space limitations.
> 
> If you want that to behave differently, then you have to talk to the
> NVME people as I told you before.

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.