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docs: update 4.3 changelog

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Zaiming (Stone) Shi 2022-09-20 15:05:27 +02:00
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CHANGES-4.3.md
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@ -9,14 +9,19 @@ File format:
- Use weight-2 heading for releases
- One list item per change topic
Change log ends with a list of GitHub PRs
## v4.3.21
### Enhancements
- TLS listener memory usage optimization
new option 'hibernate_after' to hibernate TLS process after idling
- TLS listener default buffer size to 4KB
Eliminate uncertainty that the buffer size is set by OS default
- TLS listener memory usage optimization [#9005](https://github.com/emqx/emqx/pull/9005).
New config `listener.ssl.$NAME.hibernate_after` to hibernate TLS connection process after idling.
Hibernation can reduce RAM usage significantly, but may cost more CPU.
This configuration is by default disabled.
Our preliminary test shows a 50% of RAM usage decline when configured to '5s'.
- TLS listener default buffer size to 4KB [#9007](https://github.com/emqx/emqx/pull/9007)
Eliminate uncertainty that the buffer size is set by OS default.
## v4.3.20