Hi Paolo, On Fri, May 08, 2015 at 06:26:13PM +0200, Paolo Bonzini wrote: > It probably doesn't matter much indeed, but can you time the difference? > kvm_set_irq_routing is not too frequent, but happens enough often that > we had to use a separate SRCU instance just to speed it up (see commit > 719d93cd5f5, kvm/irqchip: Speed up KVM_SET_GSI_ROUTING, 2014-01-16). The results vary a lot, but what I can say for sure is that the kvm_set_irq_routing function takes at least twice as long (~10.000 vs ~22.000 cycles) as before on my AMD Kaveri machine (maximum was between 3-4 times as long). On the other side this function is only called 2 times at boot in my test, so I couldn't detect a noticable effect on the overall boot time of the guest (37 disks were attached). Joerg -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
