BIRD memory usage

[Justin Cattle]

Hi,


A colleague of mine reported a memory usage issue with the bird daemon last
year, which resulted in a request for a core dump, but we never followed it
up.
I'd like to re-open this discussion and see if anything can be done to fix
it.

I'll provide some information regarding a production environment, where the
problem is most obvious.  But any further details and diagnostics will have
to come from our lab environment.
Please note, in production we mostly run 1.5, but in the lab we are on 1.6,
however we see the same symptoms in both environments on both versions.

The symptoms are twofold, but potentially related -  greater than expected
memory usage reported by the bird daemon itself for the number of routes,
but also massively more memory actually used by the daemon process.

When the process is started, we see "normal" memory usage, which then seems
to grow indefinitely in distinct steps, separated by a period of a few
hours.
In production, this consumes most of the 32G of memory until the kernel
oom-killer to intervenes.


Production:

BIRD 1.5.0 ready.
bird> show memory
BIRD memory usage
Routing tables:   1405 MB
Route attributes:   84 kB
ROA tables:        192  B
Protocols:          45 kB
Total:            1405 MB

bird> show route count
2273 of 2273 routes for 1142 networks



# ps u  -p 3441
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
bird      3441  0.1 55.4 18275124 18241540 ?   Ssl  Aug10  73:39
/usr/sbin/bird -f -u bird -g bird



..so that's ~1.4G reported by bird, and ~18G actually consumed by the
process.


Lab:
BIRD 1.6.0 ready.
bird> show mem
BIRD memory usage
Routing tables:    693 MB
Route attributes:   28 kB
ROA tables:        192  B
Protocols:          41 kB
Total:             693 MB

bird> show route count
175 of 175 routes for 91 networks


# ps u -p 29085
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
bird     29085  0.0 14.9 4994852 4915032 ?     Ssl  Aug05  19:41
/usr/sbin/bird -f -u bird -g bird


..so that's ~ 0.7G reported by bird, and ~5G actually consumed by the
process.

I also attached the bird config from the lab.


Any help is much appreciated!
Thanks.



Cheers,
Just

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