As mentioned here: https://www.spinics.net/lists/netdev/msg505054.html
icmp6_send() can be expensive when there are a lot of devices and anycast addresses. One solution I've prototyped is adding a global hash table to store and allow more efficient searches for anycast addresses. This works and prevents the long delays I've seen when many neighbors are invalidated in large numbers. A colleague mentioned that another alternative may be to do something like an rt6_lookup on the address and check for the RTF_ANYCAST flag. This is much simpler, and I'm in the process of testing it now. Is there any preference or recommendation as to which way to proceed before I submit a patch? Thanks, Jeff
