Re: [PATCH net-next] docs: net: document neigh gc_interval and gc_stale_time sysctls
From: Jakub Kicinski <kuba@kernel.org>
Date: 2026-02-21 00:43:46
Also in:
linux-doc, lkml
From: Jakub Kicinski <kuba@kernel.org>
Date: 2026-02-21 00:43:46
Also in:
linux-doc, lkml
On Thu, 19 Feb 2026 17:21:58 +0100 Gabriel Goller wrote:
+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.
+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 ? -- pw-bot: cr