Comment # 2 on bug 1003821 from Dominique Leuenberger

For reference from man 5 coredump.conf

>MaxUse=, KeepFree=
>  Enforce limits on the disk space taken up by externally stored coredumps.
>  MaxUse= makes sure that old coredumps are removed as soon as
>  the total disk space taken up by coredumps grows beyond this limit (defaults
>  to 10% of the total disk size).  KeepFree= controls how much disk space to
>  keep free at least (defaults to 15% of the total disk size). Note that the disk
>  space used by coredumps might temporarily exceed these limits while coredumps are
>  processed. Note that old coredumps are also removed based on time via systemd-
>  tmpfiles(8). Set either value to 0 to turn off size-based clean-up.