Re: [dpdk-users] VIRTIO for containers

["Avi Cohen (A)" <avi.cohen@huawei.com>]

Thanks you Jianfeng - pls see inline marked  [Avi Cohen (A)]

> -----Original Message-----
> From: Tan, Jianfeng [mailto:jianfeng.tan@intel.com]
> Sent: Monday, 03 July, 2017 10:22 AM
> To: Avi Cohen (A); dpdk-ovs@lists.01.org; users@dpdk.org
> Subject: RE: VIRTIO for containers
> 
> 
> 
> > -----Original Message-----
> > From: Avi Cohen (A) [mailto:avi.cohen@huawei.com]
> > Sent: Wednesday, June 28, 2017 2:45 PM
> > To: Tan, Jianfeng; dpdk-ovs@lists.01.org; users@dpdk.org
> > Subject: RE: VIRTIO for containers
> >
> > Thank you Jianfeng
> >
> > > -----Original Message-----
> > > From: Tan, Jianfeng [mailto:jianfeng.tan@intel.com]
> > > Sent: Tuesday, 27 June, 2017 5:22 PM
> > > To: Avi Cohen (A); dpdk-ovs@lists.01.org; users@dpdk.org
> > > Subject: Re: VIRTIO for containers
> > >
> > >
> > >
> > > On 6/26/2017 8:06 PM, Avi Cohen (A) wrote:
> > > > Thank You Jianfeng
> > > >
> > > >> We have developed virtio-user + vhost-kernel as the backend. In
> > > >> that scenario, you can add the tap interface into a container
> > > >> network
> > > namespace.
> > > >> And there's a vhost kthread to push the data out to user space.
> > > >>
> > > >> And I cannot guarantee the performance as it has diametric model
> > > >> in VM
> > > >> (virtio) - OVS-DPDK (vhost).
> > > >>
> > > > [Avi Cohen (A)]
> > > > Can you refer to a document how to run this setup?
> > >
> > > Please refer to
> > > http://dpdk.org/doc/guides/howto/virtio_user_as_exceptional_path.htm
> > > l
> > >
> > [Avi Cohen (A)]
> > My setup includes a container and ovs-dpdk , i still not sure about:
> >  - How to set the virtio backend port in the ovs-dpdk ?
> 
> For OVS-DPDK, you need a version above 2.7.0. Below command is used to
> create a virtio-user port with vhost-kernel backend:
> # ovs-vsctl add-port br0 virtiouser0 -- set Interface virtiouser0 type=dpdk
> options:dpdk-devargs=virtio_user0,path=/dev/vhost-net
> 
> >  - How to set the container with the virtio frontend ?
> 
> No, containers will not hold the virtio frontend in this case. Above ovs-vsctl
> command will generate a virtio-user port in OVS, and a tap interface in
> kernel, you can assign the tap interface into a net namespace of some
> container so that its networking flow will go through OVS-DPDK then to
> outside.
[Avi Cohen (A)] 
Thanks you Jianfeng
I've tested it and the performance looks very good compared to native ovs.
I have 1 more question:
You wrote " there's a vhost kthread to push the data out to user space " - 
Is that mean a copy from userspace to kernel (and viceversa) or there is a zero-copy mmap  like in AF_PACKET which handles TX/RX rings in userspace ?
Best Regards
avi
> 
> Thanks,
> Jianfeng
> 
> > Best Regards
> > avi
> >
> > > Thanks,
> > > Jianfeng
> > >
> > > > Best Regards
> > > > avi
> > > >>> I've tested the performance of a container connected to OVS-DPDK
> > > >>> via vdev-af_packet  and processed by virtual PMD, and its
> > > >>> performance is good [uses mmap'ed to userspace  - zero copy
> > > >>> RX/TX ring buffer] but not good as  the performance  of a  VM
> > > >>> connected to OVS-DPDK (@host) via vhost-user virtio.
> > > >>> Best Regards
> > > >>> avi
> > > >>>
> > > >>>> -----Original Message-----
> > > >>>> From: Tan, Jianfeng [mailto:jianfeng.tan@intel.com]
> > > >>>> Sent: Monday, 26 June, 2017 6:15 AM
> > > >>>> To: Avi Cohen (A); dpdk-ovs@lists.01.org; users@dpdk.org
> > > >>>> Subject: RE: VIRTIO for containers
> > > >>>>
> > > >>>> Hi Avi,
> > > >>>>
> > > >>>>> -----Original Message-----
> > > >>>>> From: users [mailto:users-bounces@dpdk.org] On Behalf Of Avi
> > Cohen
> > > >>>>> (A)
> > > >>>>> Sent: Sunday, June 25, 2017 11:13 PM
> > > >>>>> To: dpdk-ovs@lists.01.org; users@dpdk.org
> > > >>>>> Subject: [dpdk-users] VIRTIO for containers
> > > >>>>>
> > > >>>>> Hello,
> > > >>>>> Does  anyone know the status of this project
> > > >>>>> http://dpdk.org/ml/archives/dev/2015-November/027732.html  -
> > > >>>>> Implementing a virtio device for containers ?
> > > >>>> It has been upstreamed since v16.07. Here is a howto doc:
> > > >>>>
> > > >>>
> > >
> http://dpdk.org/doc/guides/howto/virtio_user_for_container_networking.
> > > >>> h
> > > >>>> tml
> > > >>>>
> > > >>>>
> > > >>>> Thanks,
> > > >>>> Jianfeng
> > > >>>>
> > > >>>>> Best Regards
> > > >>>>> avi