On Wed, Feb 22, 2012 at 4:48 PM, Dongsu Park <dongsu.park@xxxxxxxxxxxxxxxx> wrote: >> Try turning ioeventfd off for the virtio-blk device: >> >> -device virtio-blk-pci,ioeventfd=off,... >> >> You might see better performance since ramdisk I/O should be very >> low-latency. The overhead of using ioeventfd might not make it >> worthwhile. The ioeventfd feature was added post-0.14 IIRC. Normally >> it helps avoid stealing vcpu time and also causing lock contention >> inside the guest - but if host I/O latency is extremely low it might >> be faster to issue I/O from the vcpu thread. > > Thanks for the tip. I tried that too, but no success. My guesses have all been wrong. Maybe it's time to git bisect this instead :). Stefan -- 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
