Research increasing size of neighbor table in discovery image

[akrzos]

Research if we should bump discovery image neighbor arp table size from default:

[root@localhost ~]# sysctl net.ipv6.neigh.default.gc_thresh1
net.ipv6.neigh.default.gc_thresh1 = 128
[root@localhost ~]# sysctl net.ipv6.neigh.default.gc_thresh2
net.ipv6.neigh.default.gc_thresh2 = 512
[root@localhost ~]# sysctl net.ipv6.neigh.default.gc_thresh3
net.ipv6.neigh.default.gc_thresh3 = 1024
[root@localhost ~]# sysctl net.ipv4.neigh.default.gc_thresh1
net.ipv4.neigh.default.gc_thresh1 = 128
[root@localhost ~]# sysctl net.ipv4.neigh.default.gc_thresh2
net.ipv4.neigh.default.gc_thresh2 = 512
[root@localhost ~]# sysctl net.ipv4.neigh.default.gc_thresh3
net.ipv4.neigh.default.gc_thresh3 = 1024

To what OCP ships with via cluster-node-tuning-operator:

[root@e38-h06-000-r650 ~]# sysctl net.ipv6.neigh.default.gc_thresh1
net.ipv6.neigh.default.gc_thresh1 = 8192
[root@e38-h06-000-r650 ~]# sysctl net.ipv6.neigh.default.gc_thresh2
net.ipv6.neigh.default.gc_thresh2 = 32768
[root@e38-h06-000-r650 ~]# sysctl net.ipv6.neigh.default.gc_thresh3
net.ipv6.neigh.default.gc_thresh3 = 65536
[root@e38-h06-000-r650 ~]# sysctl net.ipv4.neigh.default.gc_thresh1
net.ipv4.neigh.default.gc_thresh1 = 8192
[root@e38-h06-000-r650 ~]# sysctl net.ipv4.neigh.default.gc_thresh2
net.ipv4.neigh.default.gc_thresh2 = 32768
[root@e38-h06-000-r650 ~]# sysctl net.ipv4.neigh.default.gc_thresh3
net.ipv4.neigh.default.gc_thresh3 = 65536