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--- proc:irq_vectors [2017/04/06 10:51] – peter
+++ proc:irq_vectors [2020/07/15 09:30] (current) – external edit 127.0.0.1
@@ Line 36: / Line 36: @@
 The **default_smp_affinity** mask applies to all non-active IRQs, which are the IRQs which have not yet been allocated/activated, and hence which lack a /proc/irq/[0-9]* directory.
+The node file on an SMP system shows the node to which the device using the IRQ reports itself as being attached.  This hardware locality information does not include information about any possible driver locality preference.
+**prof_cpu_mask** specifies which CPUs are to be profiled by the system wide profiler.  Default value is **ffffffff** (all cpus).
+The way IRQs are routed is handled by the IO-APIC, and it's Round Robin between all the CPUs which are allowed to handle it.  As usual the kernel has more info than you and does a better job than you, so the defaults are the best choice for almost everyone.