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doc: Clarify units for io_combine_limit and io_max_combine_limit.

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If these parameters are set without units, the values are interpreted
as blocks. This detail was previously missing from the documentation,
so this commit adds it.

Backpatch to v17 where io_combine_limit was added.

Author: Karina Litskevich <litskevichkarina@gmail.com>
Reviewed-by: Chao Li <lic@highgo.com>
Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/CACiT8iZCDkz1bNYQNQyvGhXWJExSnJULRTYT894u4-Ti7Yh6jw@mail.gmail.com
Backpatch-through: 17
This commit is contained in:
Fujii Masao
2025-11-07 14:42:17 +09:00
parent 5310fac6e0
commit 6fba6cb05d
1 changed files with 4 additions and 0 deletions
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doc/src/sgml/config.sgml
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@@ -2697,6 +2697,8 @@ include_dir 'conf.d'
This parameter can only be set in This parameter can only be set in
the <filename>postgresql.conf</filename> file or on the server the <filename>postgresql.conf</filename> file or on the server
command line. command line.
If this value is specified without units, it is taken as blocks,
that is <symbol>BLCKSZ</symbol> bytes, typically 8kB.
The maximum possible size depends on the operating system and block The maximum possible size depends on the operating system and block
size, but is typically 1MB on Unix and 128kB on Windows. size, but is typically 1MB on Unix and 128kB on Windows.
The default is 128kB. The default is 128kB.
@@ -2716,6 +2718,8 @@ include_dir 'conf.d'
higher than the <varname>io_max_combine_limit</varname> parameter, the higher than the <varname>io_max_combine_limit</varname> parameter, the
lower value will silently be used instead, so both may need to be raised lower value will silently be used instead, so both may need to be raised
to increase the I/O size. to increase the I/O size.
If this value is specified without units, it is taken as blocks,
that is <symbol>BLCKSZ</symbol> bytes, typically 8kB.
The maximum possible size depends on the operating system and block The maximum possible size depends on the operating system and block
size, but is typically 1MB on Unix and 128kB on Windows. size, but is typically 1MB on Unix and 128kB on Windows.
The default is 128kB. The default is 128kB.