Simon Kelley ed2ba5b07a Optimise TCP send.
In the DNS TCP code, there are a couple of places where
we have a buffer containing a message which we need to
send via TCP. The DNS protocol is that this is sent as
<16-bit length in network order><message>

Making two write calls, one for the length and one
for the message causes the TCP stack to send two packets,
one for each. A single packet containing both is
preferable from a performance POV.

Implement a scatter-gather version of our read_write()
wrapper and use it where necessary to send TCP DNS messages.
2026-01-28 14:57:50 +00:00
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