[Bug 296466] copy_file_range can be very slow on zfs even for small files
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Date: Fri, 10 Jul 2026 15:18:49 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=296466
Rick Macklem <rmacklem@FreeBSD.org> changed:
What |Removed |Added
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CC| |rmacklem@FreeBSD.org
--- Comment #7 from Rick Macklem <rmacklem@FreeBSD.org> ---
(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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