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Jichen was able to use this information immediately, to great benefit
[1].  (If those paying attention could have a quick look at that to make
sure he used it right, it would be appreciated; I'm not an expert here.)

[1]
https://review.openstack.org/#/c/527658/31..32/nova/virt/zvm/guest.py@192

On 04/10/2018 09:06 PM, Chen CH Ji wrote:
> Thanks for your info ,really helpful
> 
> Best Regards!
> 
> Kevin (Chen) Ji 纪 晨
> 
> Engineer, zVM Development, CSTL
> Notes: Chen CH Ji/China/IBM at IBMCN Internet: jichenjc at cn.ibm.com
> Phone: +86-10-82451493
> Address: 3/F Ring Building, ZhongGuanCun Software Park, Haidian
> District, Beijing 100193, PRC
> 
> Inactive hide details for Andreas Scheuring ---04/10/2018 10:19:21
> PM---Yes, that’s how it works! ---Andreas Scheuring ---04/10/2018
> 10:19:21 PM---Yes, that’s how it works! ---
> 
> From: Andreas Scheuring <scheuran at linux.vnet.ibm.com>
> To: "OpenStack Development Mailing List (not for usage questions)"
> <openstack-dev at lists.openstack.org>
> Date: 04/10/2018 10:19 PM
> Subject: Re: [openstack-dev] [nova] Changes
> toComputeVirtAPI.wait_for_instance_event
> 
> ------------------------------------------------------------------------
> 
> 
> 
> Yes, that’s how it works!
> 
> ---
> Andreas Scheuring (andreas_s)
> 
> 
> 
> On 10. Apr 2018, at 16:05, Matt Riedemann <_mriedemos at gmail.com_
> <mailto:mriedemos at gmail.com>> wrote:
> 
> On 4/9/2018 9:57 PM, Chen CH Ji wrote:
> 
>         Could you please help to share whether this kind of event is
>         sent by neutron-server or neutron agent ? I searched neutron code
>         from [1][2] this means the agent itself need tell neutron server
>         the device(VIF) is up then neutron server will send notification
>         to nova through REST API and in turn consumed by compute node?
>         [1]_https://github.com/openstack/neutron/tree/master/neutron/notify_port_active_direct_
>         <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_openstack_neutron_tree_master_neutron_notify-5Fport-5Factive-5Fdirect&d=DwMFaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=8sI5aZT88Uetyy_XsOddbPjIiLSGM-sFnua3lLy2Xr0&m=tIntFpZ0ffp-_h5CsqN1I9tv64hW2xugxBXaxDn7Z_I&s=bVXQK6rjkLdaaYUVCaIBHJYOMGQ2tPGg1bKNkOSmF7Q&e=>
>         [2]_https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/rpc.py#L264_
>         <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_openstack_neutron_blob_master_neutron_plugins_ml2_rpc.py-23L264&d=DwMFaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=8sI5aZT88Uetyy_XsOddbPjIiLSGM-sFnua3lLy2Xr0&m=tIntFpZ0ffp-_h5CsqN1I9tv64hW2xugxBXaxDn7Z_I&s=9Ywu8bHp7mWDkIviZpAXCFjiYo7RfSREeg0ze3iPedA&e=>
> 
> 
> I believe the neutron agent is the one that is getting (or polling) the
> information from the underlying network backend when VIFs are plugged or
> unplugged from a host, then route that information via RPC to the
> neutron server which then sends an os-server-external-events request to
> the compute REST API, which then routes the event information down to
> the nova-compute host where the instance is currently running.
> 
> -- 
> 
> Thanks,
> 
> Matt
> 
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