OSD Journal size config

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Hello All,
I have increased my cluster's OSD journal size from 2GB to 10GB.
But could NOT see much write/read performance improvements.

(Cluster is with 4 servers + 96 osds).

Do I miss anything here? Or do I need to update some more config
variables related to journalling?

like(using the default for the below):
==
journal max write bytes
journal max write entries
journal queue max ops
journal queue max bytes
journal max corrupt search
==
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