Re: [Qemu-devel] Using virtio-net and vhost_net on an ARM machine using qemu-system-arm & KVM

[Peter Maydell]

On 12 January 2014 21:49, Barak Wasserstrom <address@hidden> wrote:
> Thanks - I got virtio-net-device running now, but performance is terrible.
> When i look at the guest's ethernet interface features (ethtool -k eth0) i
> see all offload features are disabled.
> I'm using a virtual tap on the host (tap0 bridged to eth3).
> On the tap i also see all offload features are disabled, while on br0 and
> eth3 i see the expected offload features.
> Can this explain the terrible performance i'm facing?
> If so, how can this be changed?
> If not, what else can cause such bad performance?
> Do you know if vhost_net can be used on ARM Cortex A15 host/guest, even
> though the guest doesn't support PCI & MSIX?

I have no idea, I'm afraid. I don't have enough time available to
investigate performance issues at the moment; if you find anything
specific you can submit patches...

thanks
-- PMM