For the same traffic flow executing `tcpdump -npi mce3 host 198.18.0.1` does not produce any packets drop.
```
# netstat -hw1 -I mce3
input mce3 output
packets errs idrops bytes packets errs bytes colls
6.0M 0 0 345M 0 0 0 0
6.0M 0 0 345M 0 0 0 0
6.0M 0 0 345M 0 0 0 0
6.0M 0 0 345M 0 0 0 0
6.0M 0 0 345M 0 0 0 0
6.0M 0 0 345M 0 0 0 0
5.9M 0 0 338M 0 0 0 0
6.0M 0 0 345M 0 0 0 0
6.0M 0 0 345M 0 0 0 0
6.0M 0 0 345M 0 0 0 0
6.0M 0 0 345M 0 0 0 0
^C
```
Of course this does not mean that adding BPF filter is costless. But at least the patch reduces overhead and grows the limit when such task is safe.