Re: [RFC PATCH 00/17] virtual-bus

[Herbert Xu]

On Thu, Apr 02, 2009 at 12:02:09PM +0300, Avi Kivity wrote:
>
> There is no choice.  Exiting from the guest to the kernel to userspace  
> is prohibitively expensive, you can't do that on every packet.

I was referring to the bit between the kernel and userspace.

In any case, I just looked at the virtio mitigation code again
and I am completely baffled at why we need it.  Look at Greg's
code or the netback/netfront notification, why do we need this
completely artificial mitigation when the ring itself provides
a natural way of stemming the flow?

Cheers,
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