From: Ondřej Surý <ondrej@isc.org>
Date: Tue, 17 Sep 2024 14:02:16 +0000 (+0000)
Subject: fix: usr: Limit the outgoing UDP send queue size
X-Git-Tag: v9.21.2~34
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3b26732781c26dad9695a291c0bc43fe897f2d7d;p=thirdparty%2Fbind9.git

fix: usr: Limit the outgoing UDP send queue size

If the operating system UDP queue gets full and the outgoing UDP sending
starts to be delayed, BIND 9 could exhibit memory spikes as it tries to
enqueue all the outgoing UDP messages.  Try a bit harder to deliver the
outgoing UDP messages synchronously and if that fails, drop the outgoing
DNS message that would get queued up and then timeout on the client side.

Closes #4930

Merge branch '4930-limit-the-UDP-send-queue' into 'main'

See merge request isc-projects/bind9!9506
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3b26732781c26dad9695a291c0bc43fe897f2d7d