RE: [5.14-rc1] mlx5_core receives no interrupts with maxcpus=8

Dexuan,

On Mon, Jul 19 2021 at 20:33, Dexuan Cui wrote:

This is a bare metal x86-64 host with Intel CPUs. Yes, I believe the
issue is in the IOMMU Interrupt Remapping mechanism rather in the
NIC driver. I just don't understand why bringing the CPUs online and
offline can work around the issue. I'm trying to dump the IOMMU IR
table entries to look for any error. 

can you please enable GENERIC_IRQ_DEBUGFS and provide the output of

cat /sys/kernel/debug/irq/irqs/$THENICIRQS

Thanks,

        tglx