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This applies the same change in #9115 to FreeBSD. This was actually the old behavior in FreeBSD 12; it only regressed when FreeBSD support was added to OpenZFS. As far as I can tell, the timeline went like this: * Illumos's zfsvfs_teardown used an unconditional txg_wait_synced * Illumos added the dirty data check [^4] * FreeBSD merged in Illumos's conditional check [^3] * OpenZFS forked from Illumos * OpenZFS removed the dirty data check in #7795 [^5] * @mattmacy forked the OpenZFS repo and began to add FreeBSD support * OpenZFS PR #9115[^1] recreated the same dirty data check that Illumos used, in slightly different form. At this point the OpenZFS repo did not yet have multi-OS support. * Matt Macy merged in FreeBSD support in #8987[^2] , but it was based on slightly outdated OpenZFS code. In my local testing, this vastly improves the reboot speed of a server with a large pool that has 1000 datasets and is resilvering an HDD. [^1]: https://github.com/openzfs/zfs/pull/9115 [^2]: https://github.com/openzfs/zfs/pull/8987 [^3]: |
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