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btrfs-progs: docs: clarify zstd level mapping

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Question forwarded from wiki:
  https://btrfs.wiki.kernel.org/index.php?title=Talk:Compression&diff=0&oldid=33545

  (info few months old) higher levels: upstream and library has levels 1..22.

      mapping to the upstream levels 1 to 15

As implemented in kernel zstd.c, max level is 15 and the level selection
is direct without any translation.

Pull-request: #442
Author: jtagcat <git-12dbd862@jtag.cat>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
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jtagcat 2022-02-07 17:55:28 +01:00 committed by David Sterba
parent 471ca4a580
commit 9d85418c52
1 changed files with 1 additions and 1 deletions
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Documentation/ch-compression.rst
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@ -25,7 +25,7 @@ LZO
* good backward compatibility
ZSTD
* compression comparable to zlib with higher compression/decompression speeds and different ratio
* levels: 1 to 15
* levels: 1 to 15, mapped directly (higher levels are not available)
* since 4.14, levels since 5.1
The differences depend on the actual data set and cannot be expressed by a