Reviewed by: Matt Ahrens <m...@delphix.com>
Reviewed by: John Kennedy <john.kenn...@delphix.com>

Here is an instance where we see a big discrepancy.

estimate is : 431217656 bytes
actual size is : 492215048 bytes

Without the -e flag, the discrepancy is much higher.

Upstream bug: DLPX-45514
You can view, comment on, or merge this pull request online at:

  https://github.com/openzfs/openzfs/pull/585

-- Commit Summary --

  * 9256 zfs send space estimation off by > 10% on some datasets

-- File Changes --

    M 
usr/src/test/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_006_pos.ksh 
(2)
    M usr/src/uts/common/fs/zfs/dmu_send.c (11)

-- Patch Links --

https://github.com/openzfs/openzfs/pull/585.patch
https://github.com/openzfs/openzfs/pull/585.diff

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