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-rw-r--r--doc/src/sgml/config.sgml6
-rw-r--r--src/backend/utils/misc/guc.c3
-rw-r--r--src/backend/utils/misc/postgresql.conf.sample3
-rw-r--r--src/include/storage/bufmgr.h2
4 files changed, 5 insertions, 9 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 4f93e7062dd..e0e5a1edc60 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -2038,9 +2038,9 @@ include_dir 'conf.d'
than the OS's page cache, where performance might degrade. This
setting may have no effect on some platforms. The valid range is
between <literal>0</literal>, which disables controlled writeback,
- and <literal>2MB</literal>. The default is <literal>128Kb</> on
- Linux, <literal>0</> elsewhere. (Non-default values of
- <symbol>BLCKSZ</symbol> change the default and maximum.)
+ and <literal>2MB</literal>. The default is <literal>0</> (i.e. no
+ flush control). (Non-default values of <symbol>BLCKSZ</symbol>
+ change the maximum.)
</para>
</listitem>
</varlistentry>
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index cf3eb1a4f14..9b02111a834 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -2457,8 +2457,7 @@ static struct config_int ConfigureNamesInt[] =
GUC_UNIT_BLOCKS
},
&backend_flush_after,
- /* see bufmgr.h: OS dependent default */
- DEFAULT_BACKEND_FLUSH_AFTER, 0, WRITEBACK_MAX_PENDING_FLUSHES,
+ 0, 0, WRITEBACK_MAX_PENDING_FLUSHES,
NULL, NULL, NULL
},
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index 3ef2a9761cc..8260e371bc9 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -170,8 +170,7 @@
#max_parallel_workers_per_gather = 2 # taken from max_worker_processes
#old_snapshot_threshold = -1 # 1min-60d; -1 disables; 0 is immediate
# (change requires restart)
-#backend_flush_after = 0 # 0 disables,
- # default is 128kb on linux, 0 otherwise
+#backend_flush_after = 0 # 0 disables, default is 0
#------------------------------------------------------------------------------
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index 38b602724e1..3d5dea7efb5 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -60,11 +60,9 @@ extern PGDLLIMPORT int NBuffers;
/* FIXME: Also default to on for mmap && msync(MS_ASYNC)? */
#ifdef HAVE_SYNC_FILE_RANGE
#define DEFAULT_CHECKPOINT_FLUSH_AFTER 32
-#define DEFAULT_BACKEND_FLUSH_AFTER 16
#define DEFAULT_BGWRITER_FLUSH_AFTER 64
#else
#define DEFAULT_CHECKPOINT_FLUSH_AFTER 0
-#define DEFAULT_BACKEND_FLUSH_AFTER 0
#define DEFAULT_BGWRITER_FLUSH_AFTER 0
#endif /* HAVE_SYNC_FILE_RANGE */