Despite of traffic control on host netdevice, is it worth to impose alimit control on qemu emulated net device?

[Liu ping fan]

Hi,

As we know, in order to control the guest OS's TX rate limit, we can
apply rate limit on ingress Qdisc of host's tap device.
But I think skb will be dropped on host's tap ingress Qdisc, which
means that for those protocol lacking of congestion control such as
UDP, it will cost a lot of meaningless time to produce dropped packet
.

What about introducing rate limit on qemu's emulated net device?  I
think guest's UDP transaction will be  blocked at wait_for_wmem.

Thanks and regards,
pingfan
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