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<p>On Mon, Jan 05, 2026 at 03:35:43PM +0100, Christoph via Bird-users
wrote:</p>
<blockquote>
<p>Some more lines from the logfile suggests an issue with netlink
performance?</p>
<p>2026-01-05 01:16:00.367 [0001] <WARN> Netlink: File exists <<
many times […] 2026-01-05 01:16:44.093 [0001] <WARN> kernel1: Can’t
scan, still pruning</p>
</blockquote>
<p>This is more likely a synchronization bug. Will check though.</p>
<blockquote>
<p>2026-01-05 01:22:42.408 [0001] <BUG> kernel1.ipv4: Attempted to start
channel’s already started export 2026-01-05 01:24:21.910 [0001] <BUG>
kernel1.ipv4: Attempted to start channel’s already started export</p>
</blockquote>
<p>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.</p>
<blockquote>
<p>net.core.rmem_max=16777216 net.core.rmem_default=4194304
net.core.wmem_max=4194304</p>
<p>Are these still sensible values or should they be increased further?
This is a BGP router getting 2 full tables.</p>
</blockquote>
<p>BIRD 3 should be <em>faster</em> doing this, not slower. If you need
to update these values, it’s definitely <em>our</em> bug.</p>
<p>Maria</p>
<p>–<br />
Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.</p>
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