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

On 2017年05月17日 14:16, Jason Wang wrote:

On 2017年05月16日 15:12, Wei Wang wrote:


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:


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()


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.


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