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On 8 December 2016 at 20:55, Armando M. <armamig at gmail.com> wrote:

>
>
> On 5 December 2016 at 07:59, Bence Romsics <bence.romsics at gmail.com>
> wrote:
>
>> Hi,
>>
>> I measured how the new trunk API scales with lots of subports. You can
>> find the results here:
>>
>> https://wiki.openstack.org/wiki/Neutron_Trunk_API_Performance_and_Scaling
>>
>> Hope you find it useful. There are several open ends, let me know if
>> you're interested in following up some of them.
>>
>
> I looked into [1] a little bit as it bothered me :)
>
> Here's my findings:
>
>
>    - openstack port list is slower than neutron port-list as it looks
>    like the command goes to Nova first [2], which is where the overhead comes
>    from.
>    - when you have subports the port-list response gets bigger because of
>    the bigger response due to the trunk-details extension.
>    - However, the bulk of the time is spent in [3], when building the
>    payload for a port involved as a parent port. In no other case you will see
>    the overhead as in no other case the loop over subports is executed.
>
> The hook should be optimized!
>

Follow up: Kevin and I put together a couple of patches [1,2] to fix and
validate how to speed up the lookup. We'll dig into why sqlalchemy is
acting differently when listing ports with or without filters, but this
should do for now.

Cheers,
Armando

[1] https://review.openstack.org/#/c/409267/
[2] https://review.openstack.org/#/c/408983/


> [1] https://wiki.openstack.org/wiki/Neutron_Trunk_API_Performanc
> e_and_Scaling#surprise_effect_on_filtered_port_listings
> [2] http://paste.openstack.org/show/591882/
> [3] https://github.com/openstack/neutron/blob/master/
> neutron/services/trunk/plugin.py#L42
>
>
>> Cheers,
>> Bence Romsics
>>
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