Simon RichterDo softirqs in Linux have node affinity?
The xe driver forwards MEI interrupts via softirq, and that one is allocated on node 0, hardcoded. Is that bad if another node has the IRQ handler that pokes the softirq?
Ben Hutchings@GyrosGeier As I understand it softirqs are replicated across all CPUs. Normally they run on whichever CPU(s) trigger them. Networking has the RPS and RFS features to spread or direct packet processing across multiple instances of the NAPI softirqs. I don't know about other softirq types.
@bwh ah, excellent, so the node number is not used for the call, only for where the irq_desc is allocated, so https://patchwork.freedesktop.org/series/156945/ is somewhere between "unnecessary" and "cosmetic".