mynewt-nimble

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There's currently no documentation about Data Length Extension.

It is silly to list a feature on the front page of documentation that isn't actually documented in any normal way.

Yes, it is indeed not easy to find. Take a look at nimble/controller/syscfg.yml:

    BLE_LL_CFG_FEAT_DATA_LEN_EXT:
        description: >
            This option enables/disables the data length update procedure in
            the controller. If enabled, the controller is allowed to change the
            size of tx/rx pdu's used in a connection. This option has only
            minor impact on code size and non on RAM.
        value: '1'

And from my own experience, looking at

• BLE_LL_MAX_PKT_SIZE
• BLE_LL_CONN_INIT_MAX_TX_BYTES,
• BLE_LL_SUPP_MAX_RX_BYTES
• BLE_LL_SUPP_MAX_TX_BYTES

will add to the picture and hopefully achieve the desired behavior?!

Will investigate and test out, thanks @haukepetersen.

how was your investigation? any chances you could send PR with documentation update?