Here are the vmcore.N.gz sizes for a few configured levels:
```
-2 30983609 clamped to 1
-1 28151699 in zlib, -1 selects the default, which is 6
0 31335591 clamped to 1; 0 is valid, but makes no sense
1 31396046
9 28064805
10 28010073 clamped to 9
```