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tarfs.5: Document the importance of zstd framing
Reviewed by: des, kib MFC after: 1 week Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D44628
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@ -61,6 +61,19 @@ sysctl setting and tunable.
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Setting it to 0 will reset it to its default value.
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Note that changes to this setting only apply to filesystems mounted
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after the change.
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.Pp
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When the backing tar file is compressed with
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.Xr zstd 1 ,
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I/O performance can be improved by ensuring that compressed data is
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broken up into multiple frames.
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This helps minimize unnecessary decompression work.
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When using
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.Xr bsdtar 1
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to create the tar file, this can be achieved using the
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.Cm zstd:max-frame-size
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and
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.Cm ztsd:frame-per-file
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options.
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.Sh DIAGNOSTICS
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If enabled by the
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.Dv TARFS_DEBUG
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