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DOC: quic: add note on performance issue with listener contention

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Complete quic4/quic6 bind lines by a note on performance issues due to
receiver socket contention. Suggest to use sharding to improve the
situation.

This should be backported up to 2.6.

(cherry picked from commit 7078fb1f3a11b1af3170e47cbc250387b3eb6ee5)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
This commit is contained in:
Amaury Denoyelle 2022-11-22 11:26:16 +01:00 committed by Christopher Faulet
parent 9840786232
commit bc0dd61e23
1 changed files with 8 additions and 2 deletions
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10
doc/configuration.txt
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@ -4495,9 +4495,15 @@ bind /<path> [, ...] [param*]
to receive a FD over the unix socket and uses it as if it to receive a FD over the unix socket and uses it as if it
was the FD of an accept(). Should be used carefully. was the FD of an accept(). Should be used carefully.
- 'quic4@' -> address is resolved as IPv4 and protocol UDP - 'quic4@' -> address is resolved as IPv4 and protocol UDP
is used. is used. Note that QUIC connections attached to a
listener will be multiplexed over the listener socket.
With a large traffic this has a noticeable impact on
performance and CPU consumption. To improve this, you
should duplicate QUIC listener instances over several
threads, for example using "shards" keyword.
- 'quic6@' -> address is resolved as IPv6 and protocol UDP - 'quic6@' -> address is resolved as IPv6 and protocol UDP
is used. is used. The performance note for QUIC over IPv4 applies
as well.
You may want to reference some environment variables in the You may want to reference some environment variables in the
address parameter, see section 2.3 about environment address parameter, see section 2.3 about environment