System freezes with Bird running on FreeBSD 11.1

[Ondrej Zajicek]

On Wed, Jan 03, 2018 at 12:02:24PM -0200, Clistenes Viana wrote:
> Following the outputs;
> 
>  # netstat -nr4 | wc -l
>    688431
> 
>  # time netstat -nr > /dev/null
>  3.474u 1.063s 0:04.57 99.1% 183+183k 0+0io 6pf+0w
>  3.519u 1.196s 0:04.71 99.7% 183+183k 0+0io 0pf+0w
>  3.468u 0.841s 0:04.31 99.7% 183+183k 0+0io 0pf+0w
>  3.492u 0.841s 0:04.33 100.0% 183+183k 0+0io 0pf+0w
> ‪
> More info about bird;

Hi

I tested that on Linux an FreeBSD 10, and for full BGP table
(680k routes) the scan took about 1.3 s on Linux and about
2.4 s on FreeBSD 10. Unfortunately i don't have FreeBSD 11
here now to test it.

Also it is 'system freeze' or just BIRD freeze?

There are two possible issues - logging and memory:

Enabling 'debug {routes}' or 'debug all' for Kernel protocol could slow
down the scan significantly.

Kernel table scan on BSD require a buffer for all routes, so it may
require some nontrivial additional memory during routing table scans.

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."