Re: [PATCH RFC/RFT net-next 00/17] net: Convert neighbor tables to per-namespace

On Thu, Jul 19, 2018 at 9:16 AM David Ahern [off-list ref] wrote:

Chatting with Nikolay about this and he brought up a good corollary - ip
fragmentation. It really is a similar problem in that memory is consumed
as a result of packets received from an external entity. The ipfrag
sysctls are per namespace with a limit that non-init_net namespaces can
not set high_thresh > the current value of init_net. Potential memory
consumed by fragments scales with the number of namespaces which is the
primary concern with making neighbor tables per namespace.

Nothing new, already discussed:
https://marc.info/?l=linux-netdev&m=140391416215988&w=2

:)