Comment 2 for bug 1918936

Current size of ipset used for testing:

| ubuntu@juju-87625f-hloeung-93:~/ipset$ wc -l ~/whitelist-ipv4
| 515698 /home/ubuntu/whitelist-ipv4

With the patch:

| ubuntu@juju-87625f-hloeung-93:~/ipset$ sudo ipset destroy test
| ubuntu@juju-87625f-hloeung-93:~/ipset$ sudo ipset create test hash:net,port,net hashsize 4096 maxelem 786432
| ubuntu@juju-87625f-hloeung-93:~/ipset$ time sudo ~/ipset/src/ipset restore < ~/whitelist-ipv4
|
| real 0m7.204s
| user 0m3.104s
| sys 0m3.877s

vs without.

| ubuntu@juju-87625f-hloeung-93:~/ipset$ sudo ipset destroy test
| ubuntu@juju-87625f-hloeung-93:~/ipset$ sudo ipset create test hash:net,port,net hashsize 4096 maxelem 786432
| ubuntu@juju-87625f-hloeung-93:~/ipset$ time sudo ~/ipset/src/ipset restore < ~/whitelist-ipv4
|
| real 0m33.232s
| user 0m25.291s
| sys 0m7.682s

Output of what I used to revert to compare - https://paste.ubuntu.com/p/x9wcsQdxMn/