Re: PCI passthrough with VT-d - native performance

Avi Kivity
2008-07-16T14:36:31Z

Ben-Ami Yassour wrote:
> In last few tests that we made with PCI-passthrough and VT-d using
> iperf, we were able to get the same throughput as on native OS with a 1G
> NIC

Excellent!

> (with higher CPU utilization).
>

How much higher?

> The following patches are the PCI-passthrough patches that Amit sent
> (re-based on the last kvm tree), followed by a few improvements and the
> VT-d extension.
> I am also sending the userspace patches: the patch that Amit sent for
> PCI passthrough and the direct-mmio extension for userspace (note that
> without the direct mmio extension we get less then half the throughput).
>

Is mmio passthrough the reason for the performance improvement? If not,
what was the problem?

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