RE: [RFC PATCH v8 00/16] Provide a zero-copy method on KVMvirtio-net.

From: Dong, Eddie
Date: Tue Aug 03 2010 - 22:13:14 EST

Arnd Bergmann wrote:
> On Friday 30 July 2010 17:51:52 Shirley Ma wrote:
>> On Fri, 2010-07-30 at 16:53 +0800, Xin, Xiaohui wrote:
>>>> Since vhost-net already supports macvtap/tun backends, do you think
>>>> whether it's better to implement zero copy in macvtap/tun than
>>>> inducing a new media passthrough device here?
>>> I'm not sure if there will be more duplicated code in the kernel.
>> I think it should be less duplicated code in the kernel if we use
>> macvtap to support what media passthrough driver here. Since macvtap
>> has support virtio_net head and offloading already, the only missing
>> func is zero copy. Also QEMU supports macvtap, we just need add a
>> zero copy flag in option.
> Yes, I fully agree and that was one of the intended directions for
> macvtap to start with. Thank you so much for following up on that,
> I've long been planning to work on macvtap zero-copy myself but it's
> now lower on my priorities, so it's good to hear that you made
> progress on it, even if there are still performance issues.

But zero-copy is a Linux generic feature that can be used by other VMMs as well if the BE service drivers want to incorporate. If we can make mp device VMM-agnostic (it may be not yet in current patch), that will help Linux more.

Thx, Eddie--
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