On Sat, 2011-05-07 at 08:14 -0500, Anthony Liguori wrote: > It seems like this patch is simply avoiding raising the interrupt line > if the ISR has not been acknowledged yet. I don't think there's a > functional issue here but I'm surprised that it's a win. There should > be a very short window when the interrupt is lowered in the APIC but > still not acknowledged in the ISR. > > You should just be saving a pretty cheap system call. I wonder if the > system call is taking longer than it should.. The patch seems to fix a bug where the guest kernel breaks down under interrupt storm and stops doing VIRTIO_PCI_QUEUE_NOTIFY. We assumed it was something with our code but your comments make me wonder if there's a real problem in KVM_IRQ_LINE. Pekka -- 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
