native kvm tool hrtimer problem

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Hi all,
for an university study, I'm doing some network test between two vm
using native linux kvm tool and connected via tap/virtio/vhost.
When I run my script (several consecutive iperf tcp and udp
execution), the first vm freeze with a message like: "hrtimer:
interrupt took * ns".
Is this a bug? (In order to complete the test i had to set the number
of guest cpu to 1)

Do you know what is the expected throughput between two vm using virtio/vhost?

Thanks,
Daniele
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