Hello, We’ve built Bird from origin/bmp branch and found out that BMP most likely introduces memory leak.
In the experiment, the device has 4 BGP peers (see attached bird.conf).
The device is flooded with massive number of routes from each peer.
Memory-usage snapshots are taken: before flooding with routes, after flooding
with routes,
after dropping BGP sessions and waiting for routes to be removed for Linux.
The experiment was performed twice: with and without BMP configured.
Case 1: With BMP configured:
Before flooding:
BIRD memory usage
Routing tables: 20 kB
Route attributes: 6224 B
Protocols: 33 kB
Total: 123 kB
After flooding (about 1150000 routes in Linux):
BIRD memory usage
Routing tables: 412 MB
Route attributes: 11 kB
Protocols: 1473 MB
Total: 1885 MB
After dropping BGP sessions and waiting for routes to be removed from kernel:
BIRD memory usage
Routing tables: 284 kB
Route attributes: 10 kB
Protocols: 1018 MB
Total: 1019 MB
Case 2: Same config, but without protocol bmp {…}:
Before flooding:
BIRD memory usage
Routing tables: 20 kB
Route attributes: 6224 B
Protocols: 26 kB
Total: 112 kB
After flooding (about 1130000 routes in Linux):
BIRD memory usage
Routing tables: 381 MB
Route attributes: 11 kB
Protocols: 163 MB
Total: 544 MB
After dropping BGP sessions and waiting for routes to be removed from kernel:
BIRD memory usage
Routing tables: 284 kB
Route attributes: 10 kB
Protocols: 795 kB
Total: 1153 kB
We would like to ask about code examination and pointing us towards probable
cause of the issue,
because we are unable to find it ourselves.
Thanks in advance and regards,
Dawid Macek
bird.conf
Description: bird.conf
