| FreeBSD | Linux | ||
| Number of the rules | E[S] | Number of the rules | E[S] |
| 10 | 0.09 | 10 | 0.10 |
| 20 | 0.14 | 20 | 0.15 |
| 30 | 0.18 | 30 | 0.19 |
| 40 | 0.22 | 40 | 0.23 |
| 50 | 0.24 | 50 | 0.25 |
| 60 | 0.26 | 60 | 0.27 |
| 70 | 0.27 | 70 | 0.28 |
| 80 | 0.28 | 80 | 0.30 |
| 90 | 0.29 | 90 | 0.31 |
| 100 | 0.30 | 100 | 0.32 |