Xenial - OpenvSwitch 2.5 + DPDK 2.2 with VirtIO brings KVM guest connectivity down on all vNICs!

[Christian Ehrhardt]

As James and I answered on the Bug, here more of an FYI towards the list.

That "to consume all virtio devices" is a known DPDK .... ummm ... Feature.

Not limited to Openvswitch-DPDK you always have to work with
--pci-blacklist or --pci-whitelist on the EAL options for whatever DPDK
based solution you are using.

See this for EAL parameters in general:
http://dpdk.org/doc/guides-1.8/testpmd_app_ug/run_app.html

This issue is described more "verbose" in the serverguide section about
DPDK once released for 16.04



Christian Ehrhardt
Software Engineer, Ubuntu Server
Canonical Ltd

On Mon, Apr 11, 2016 at 1:00 AM, Martinx - ジェームズ <thiagocmartinsc at gmail.com>
wrote:

> Hey guys, Christian, James...
>
>  Now that I can use OpenvSwitch with DPDK easily on bare-metal host, when
> with ixgbe NIC cars, I know how to give it a try when inside of a KVM Guest.
>
>  However, it is not working!
>
>  In fact, soon as I start up openvswitch-dpdk inside of a KVM guest, it
> brings down all the VirtIO NICs! Including non-DPDK NIC VirtIO devices!
>
>  I can reproduce the problem easily, on two hosts, a Dell server and a
> Macbook Pro, both running Xenial on host and on VM.
>
>  Also, if DPDK Openvswitch options are enabled on
> /etc/default/openvswitch, soft reboot stops working! Very weird...
>
>
> * Launchpad Bug Report:
>
> - OpenvSwitch with DPDK brings all VirtIO NICs down, software reboot also
> doesn't work:
>
>  https://bugs.launchpad.net/ubuntu/+source/openvswitch/+bug/1568627
>
> * Video Bug Report:
>
> - Xenial with OpenvSwitch + DPDK doesn't work with VirtIO (KVM guest):
>
>  https://www.youtube.com/watch?v=sSBqYUVsO8U
>
>  IMPORTANT NOTE: I just tried this very same setup, on top of Trusty KVM
> Guest with Linux 4.4 (same Xenial kernel), but with DPDK 2.0 and
> OpenvSwitch 2.4 from Liberty Cloud Archive, and it works (at least, it
> doesn't lose connectivity and soft reboot works too)!
>
>  So, something is wrong with OpenvSwitch 2.5 when with DPDK 2.2 (Xenial
> Combo).
>
> Cheers!
> Thiago
>
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