On 20.02.2026 16:43, Jakub Kicinski wrote:

On Thu, 19 Feb 2026 17:21:58 +0100 Gabriel Goller wrote:

quoted

+neigh/default/gc_interval - INTEGER
+	How often the garbage collector for neighbor entries should run. This
+	value applies to the entire table, not individual entries.
+
+	Default: 30 seconds

AI suggests that this value is not actually currently used
in our implementation. I can't find any use either, TBH.
It's read and can be written but it's seemingly not used for anything.

You're right, I'll remove this section.

quoted

+neigh/default/gc_stale_time - INTEGER
+	Determines how long a neighbor entry can remain unused before it is
+	considered stale and eligible for garbage collection. Entries that have
+	not been used for longer than this time will be removed by the garbage
+	collector, unless they have active references, are marked as PERMANENT,
+	or carry the NTF_EXT_LEARNED or NTF_EXT_VALIDATED flag.
+
+	Default: 60 seconds

AI adds:

  Important caveat: This check is only reached when total_entries >= gc_thresh1
  (line 1000-1001). Below that threshold, the periodic GC skips the scan
  entirely.

If true I think we should mention that ?

Yes this is true -- I'll mention this in the description.

Thanks for the review!