[ovs-discuss] [OVN] Python IDL: handling modify operations in update2 notifications is slow

Miguel Angel Ajo Pelayo majopela at redhat.com
Tue Feb 27 15:15:18 UTC 2018

Wow, amazing, big +1 for such patch. :D

On Tue, Feb 27, 2018 at 3:57 PM Daniel Alvarez Sanchez <dalvarez at redhat.com>

> Hi all,
> When working on the performance of the OVN OpenStack integration and
> following up this thread [0].
> I went a bit deeper trying to find out the root cause of the linear
> growth. It happens that during the processing of the update2 messages, when
> there's a 'modify' operation, the data is converted to JSON [1] and then we
> build a Row from this JSON [2].
> This seems pretty useless and, since the JSON document is not used
> anywhere else, I just avoided that conversion. This conversion takes longer
> as the number of elements in the row increases, which is the case of adding
> a new address to the Address_Set table or adding new ACLs to the acl column
> in Logical_Switch. This have a big impact at scale and it can be easily
> fixed.
> After removing the extra conversions (I'll be submitting the patch in a
> while), the time for creating ports from OpenStack remains almost constant
> regardless of the amount of ports in the system as you can see in the
> attached image and further in this blogpost [3] and it's cut down
> considerably.
> This would make the implementation of the Port_Set discussed at [0] less
> urgent.
> [0]
> https://mail.openvswitch.org/pipermail/ovs-discuss/2018-February/046149.html
> [1]
> https://github.com/openvswitch/ovs/blob/f73d562fc0ee3ff43f65cc418f213a79a727cb19/python/ovs/db/idl.py#L604
> [2]
> https://github.com/openvswitch/ovs/blob/f73d562fc0ee3ff43f65cc418f213a79a727cb19/python/ovs/db/idl.py#L524
> [3]
> http://dani.foroselectronica.es/ovn-profiling-and-optimizing-ports-creation-434/
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