Re: [dpdk-users] VIRTIO for containers

["Tan, Jianfeng" <jianfeng.tan@intel.com>]

> -----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.html
> >
> [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.

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