** Changed in: neutron
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1312482
Title:
scalability problem of router routes update
Status in OpenStack Neutron (virtual network service):
Fix Released
Bug description:
Updating router routes takes long time when increasing a number of routes.
The critical problem is that it is CPU bound task of neutron-server and
neutron-server can not reply for other request.
I show below a measurement example of neutron-server's CPU usage.
Setting routes to a router. (0 to N)
100 routes: 1 sec
1000 routes: 5 sec
10000 routes: 51 sec
I found validation check of parameter is inefficient. The following
example support it too.
No change but just specify same routes to a router. (N to N, DB is not
changed)
100 routes: <1 sec
1000 routes: 4 sec
10000 routes: 52 sec
Remove routes from a router. (N to 0)
100 routes: <1 sec
1000 routes: 8 sec
10000 routes: 750 sec
I found handling of record deletion is bad. It takes N**2 order.
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