Re: [virtio-dev] [PATCH v3 0/7] Vhost-pci for inter-VM communication

[Jason Wang <jasowang@redhat.com>]

On 2017年12月05日 15:15, Wei Wang wrote:
> On 12/05/2017 03:01 PM, Jason Wang wrote:
> > On 2017年12月05日 11:33, Wei Wang wrote:
> > > Vhost-pci is a point-to-point based inter-VM communication solution. 
> > > This
> > > patch series implements the vhost-pci-net device setup and 
> > > emulation. The
> > > device is implemented as a virtio device, and it is set up via the
> > > vhost-user protocol to get the neessary info (e.g the memory info of 
> > > the
> > > remote VM, vring info).
> > >
> > > Currently, only the fundamental functions are implemented. More 
> > > features,
> > > such as MQ and live migration, will be updated in the future.
> > >
> > > The DPDK PMD of vhost-pci has been posted to the dpdk mailinglist here:
> > > http://dpdk.org/ml/archives/dev/2017-November/082615.html
> > >
> > > v2->v3 changes:
> > > 1) static device creation: instead of creating and hot-plugging the
> > >     device when receiving a vhost-user msg, the device is not created
> > >     via the qemu booting command line.
> > > 2) remove vqs: rq and ctrlq are removed in this version.
> > >      - receive vq: the receive vq is not needed anymore. The PMD 
> > > directly
> > >                    shares the remote txq and rxq - grab from remote 
> > > txq to
> > >                    receive packets, and put to rxq to send packets.
> > >      - ctrlq: the ctrlq is replaced by the first 4KB metadata area 
> > > of the
> > >               device Bar-2.
> > > 3) simpler implementation: the entire implementation has been tailored
> > >     from ~1800 LOC to ~850 LOC.
> >
> > Hi:
> >
> > Any performance numbers you can share?
>
> Hi Jason,
>
> Performance testing and tuning on the data plane is in progress (btw, 
> that wouldn't affect the device part patches).
> If possible, could we start the device part patch review in the meantime?
>
> Best,
> Wei

Hi Wei:

Will do, but basically, the cover lacks of the motivation for vhost-pci 
and I want to see some numbers first since I suspect it can over-perform 
exist data-path.

Thanks