[Bug 296466] copy_file_range can be very slow on zfs even for small files

[email protected] Fri, 10 Jul 2026 15:18:49 +0000

Newsgroups	gmane.os.freebsd.devel.file-systems
Message-ID	<[email protected]/bugzilla/>

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=296466

Rick Macklem <[email protected]> changed:

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--- Comment #7 from Rick Macklem <[email protected]> ---
(In reply to martin from comment #6)
Try setting
vfs.zfs.dmu_offset_next_sync=0

This makes SEEK_DATA/SEEK_HOLE run much
faster, but can miss a hole on recently
written data. (For copy_file_range(), that
means it might not maintain the hole and write
bytes of zeros to the copied file.)

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