virtio for 9.1-R

Bryan Venteicher bryanv at
Thu Nov 29 18:03:15 UTC 2012



> What's the actual reallife performance benefits from virtio?
>  Twofold,
> threefold, more, less?

A magnitude or more. I can push 6-7Gbs through vtnet vs. <400Mbs with
the emulated e1000. The best advice of course is just to try it out
in your environment. It may not matter depending on your needs.

IIRC, I could get Linux VirtIO to do 8-9Gbs in the same setup. I hope
to close that gap with my upcoming work.


> Linux-KVM web-site,, mentions
> that they can push 1Gbps or so through the virtio network driver, but
> the number seems meaningless, since no context is established of the
> KVM performance prior to virtio.
> Another official-looking page,,
> fails to make any number-based sales pitch whatsoever, whereas
> likewise attempts to
> show up some random meaningless numbers, still failing to establish
> the context of what the performance is like without virtio.
> C.
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