[OpenWrt-Devel] [RFC] BCM63XX SMP: assign interrupts to one cpu rather than both

José Vázquez ppvazquezfer at gmail.com
Fri Jul 4 06:46:25 EDT 2014

Found this comment in a Broadcom source code that has an interesting
comment; in addition, danitool, testing different kernel command lines
found that forcing all the interrupts to CPUx the network throughput
was increased more than a 15% (as far i remember).

Any comment will be welcome.


 		 .depth = 1,
 		 .lock = __SPIN_LOCK_UNLOCKED(irq_desc->lock),
 #ifdef CONFIG_SMP
+#if defined(CONFIG_MIPS_BRCM)
+		/* We don't have an interrupt controller to distribute interrupts, so
+		initially assign all interrupts to one cpu, then make explicit
adjustments if needed */
+		.affinity = CPU_MASK_CPU0
 		.affinity = CPU_MASK_ALL
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