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<a href="https://github.com/tarantool/tarantool/commit/<a class=hub.com/tarantool/tarantool/commit/55dcde00d15553c897fc99f1e24124a4393c453b">55dcde00d<a href="https://github.com/tarantool/tarantool/commit/55dcde00d15553c897fc99f1e24124a4393c453b">&quot;&gt;xlog: fix sync_is_async xlog option

The behaviour change was introduced in cda3cb55: sync_is_async option
was forgotten to be updated from xdir; sync_interval was forgotten too,
but was restored in 1900c58b.

The commit fixes the performance regression around 6-14% for average RPS
on default nosqlbench workload with 30 seconds duration. The additional
information about benchmarking can be found in #3747.

Thanks to Vladimir Davydov (@locker) for the investigation of the
cda3cb55 changes.

Closes #3747

(cherry picked from commit </a><a class="double-link" href="https://github.com/tarantool/tarantool/commit/<a class="double-link" href="https://github.com/tarantool/tarantool/commit/cd9cc4c5057581970db4f8107c2a86ff0b24f4e2">cd9cc4c50</a>">cd9cc4c50</a><a href="https://github.com/tarantool/tarantool/commit/55dcde00d15553c897fc99f1e24124a4393c453b">)

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