From: Eric Dumazet <eduma...@google.com> Date: Thu, 8 Mar 2018 12:51:41 -0800
> fallback tunnels (like tunl0, gre0, gretap0, erspan0, sit0, > ip6tnl0, ip6gre0) are automatically created when the corresponding > module is loaded. > > These tunnels are also automatically created when a new network > namespace is created, at a great cost. > > In many cases, netns are used for isolation purposes, and these > extra network devices are a waste of resources. We are using > thousands of netns per host, and hit the netns creation/delete > bottleneck a lot. (Many thanks to Kirill for recent work on this) > > Add a new sysctl so that we can opt-out from this automatic creation. > > Note that these tunnels are still created for the initial namespace, > to be the least intrusive for typical setups. > > Tested: ... > Signed-off-by: Eric Dumazet <eduma...@google.com> Applied, thanks Eric.
