On Wed, Feb 22, 2012 at 4:48 PM, Dongsu Park
<address@hidden> 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
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