On Mon, Jan 05, 2026 at 03:35:43PM +0100, Christoph via Bird-users wrote:

Some more lines from the logfile suggests an issue with netlink performance?

2026-01-05 01:16:00.367 [0001] Netlink: File exists << many times […] 2026-01-05 01:16:44.093 [0001] kernel1: Can’t scan, still pruning

This is more likely a synchronization bug. Will check though.

2026-01-05 01:22:42.408 [0001] kernel1.ipv4: Attempted to start channel’s already started export 2026-01-05 01:24:21.910 [0001] kernel1.ipv4: Attempted to start channel’s already started export

And this is even more suspicious. Will check whether it’s possible to reproduce that from this description and get back to you if i need more information from you.

net.core.rmem_max=16777216 net.core.rmem_default=4194304 net.core.wmem_max=4194304

Are these still sensible values or should they be increased further? This is a BGP router getting 2 full tables.

BIRD 3 should be faster doing this, not slower. If you need to update these values, it’s definitely our bug.

Maria

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Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.