bird became slow

[Alexander Shikov]

Hello!

My bird handles ~170 BGP peers, ~60000 routes. Every peer is in
the separate table, then routes from peers' tables are exported
to main table and vice versa.

Yesterday bird became very slow, BGP sessions started flapping.
If I restart bird, it is stable for 5-10 minutes, and after that
problem occurs again.

I see following messages in log:

Nov  9 09:00:30 rs0 kernel: sonewconn: pcb 0xfffff8005e640620: Listen queue overflow: 13 already in queue awaiting acceptance (637 occurrences)
Nov  9 09:01:30 rs0 kernel: sonewconn: pcb 0xfffff8005e640620: Listen queue overflow: 13 already in queue awaiting acceptance (614 occurrences)
Nov  9 09:01:56 rs0 bird: I/O loop cycle took 447740 ms for 427 events
Nov  9 09:02:30 rs0 kernel: sonewconn: pcb 0xfffff8005e640620: Listen queue overflow: 13 already in queue awaiting acceptance (557 occurrences)

I'm still running 1.5.0, FreeBSD 10.3-RELEASE.
Is that known issue? Has it been fixed in later releases?

Thanks in advance!

-- 
Alexander Shikov
Technical Staff, Digital Telecom IX
Tel.: +380 44 201 14 07
http://dtel-ix.net/