Serf RTT not giving correct values

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Harsha Nanayakkara

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Jun 15, 2025, 5:13:09 AMJun 15

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Hello,

I am currently observing the following issues while using vanilla serf. I am running serf on 162 containers which are running on containerlab. I am also adding custom delays to thhe links using tc qdisc command. However, I have observed the following;

- Before any delay is added Serf gives accurate RTTs aligned with actual RTTs no matter how many nodes we have (eg: 0-2ms)
- After adding delay it works for about 10 nodes.. But, keep giving much higher RTTs when the node count is increased (eg: for the RTT of 50ms, it gives 10-20ms higher values like 60ms,70ms)