He said "The RAM needed for each container was very small" - the RAM is _not_ the limit here. The point is that running many containers is a very different (har

He said "The RAM needed for each container was very small" - the RAM is _not_ the limit here. The point is that running many containers is a very different (hard to compare directly) type of load than the main, well optimized use case of running a single large desktop environment. Networking in particular: with thousands of containers, now there are lots more interfaces, routes, conntrack entries, "background" traffic, iptables rules etc. Some problems are algorithmic: for example historically a lot of code has been written with the assumption that the number of network interfaces is small. With >1k interfaces, suddenly O(n) lookups take time. Similarly, iptables rules are run sequentially. etc. Some resources have limits. Exceeding these may impact performance. In his case the load blew up the ARP cache. Nice!