Hi Justin,
On 2016-09-05 16:21, Justin Cattle wrote:
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
Thanks for this report. I successfully simulated this weird behavior
too. The setting of kernel protocol with some export filter will cause
memory leak bug. I prepared fixing commits in branch
`krt-export-filtr-fix'
https://gitlab.labs.nic.cz/labs/bird/commits/krt-export-filtr-fix
Can you please download it and confirm, that the bug is fixed?
Best,
Pavel
..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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