[Jetson AGX Orin] Intel Network Card RX Interrupts Locked to CPU0 Despite Affinity Settings

[WayneWWW]

yes, it is a known issue and will not fix.

You could apply the GIC MSI patch here to unblock the GIC MSI and your interrupt could be routed to other CPU cores.

R36.3 Patch to re-enable GICv2m for PCIe MSI interrupts and restore I/O performance

R36.x has a major performance regression over R35.x. The problem is all PCIe MSI interrupts are now routed to CPU 0 whereas they used to be distributed across all CPU cores. For any workload requiring high I/O bandwidth, e.g. multiple NVME devices, this results in lower performance and system lock ups due to CPU 0 being overwhelmed with interrupts. There was an earlier thread on this issue but with no solution: [Orin NX R36.2 cannot change IRQ smp affinity - #7 by thegtx25] I’ve ported the o…