Re: [Qemu-devel] [virtio-dev] Re: [PATCH v2 00/16] Vhost-pci for inter-VM communication

[Jason Wang]

On 2017年05月17日 14:16, Jason Wang wrote:
> On 2017年05月16日 15:12, Wei Wang wrote:
> > > >
> > >
> > > Hi:
> > >
> > > Care to post the driver codes too?
> > OK. It may take some time to clean up the driver code before post it 
> > out. You can first
> > have a check of the draft at the repo here:
> > https://github.com/wei-w-wang/vhost-pci-driver
> >
> > Best,
> > Wei
>
> Interesting, looks like there's one copy on tx side. We used to have 
> zerocopy support for tun for VM2VM traffic. Could you please try to 
> compare it with your vhost-pci-net by:
>
> - make sure zerocopy is enabled for vhost_net
> - comment skb_orphan_frags() in tun_net_xmit()
>
> Thanks

You can even enable tx batching for tun by ethtool -C tap0 rx-frames N. 
This will greatly improve the performance according to my test.

Thanks