From: Jesper Dangaard Brouer <redacted>
Date: Sat, 8 Dec 2018 12:36:10 +0100

The annoying part is actually that depending on the kernel config
options CONFIG_XFRM, CONFIG_NF_CONNTRACK and CONFIG_BRIDGE_NETFILTER,
whether there is a cache-line split, where mem_info gets moved into the
next cacheline.

Note that Florian Westphal's work (trying to help MP-TCP) would
eliminate this variability.