❦ 2 décembre 2019 22:48 +01, Vincent Bernat <ber...@luffy.cx>: > Also, from 4.2, the cache entries are only created for exceptions (PMTU > notably). So, in fact, the initial value should be mostly safe. You can > monitor it with `/proc/net/rt6_stats`. This is the before last value. If > you can share what you have, I would be curious to know how low it is > (compared to the 4th entry notably).
Just to be clear: I did forget this fact and therefore my initial recommendation to increase max_size with more than 4096 active hosts does not apply anymore (as long as you have a 4.2+ kernel). Keep the default value and watch `/proc/net/rt6_stats`. -- Program defensively. - The Elements of Programming Style (Kernighan & Plauger)