add conf item for write buffer size

Signed-off-by: Jason Volk <jason@zemos.net>

conduwuit-example.toml

@@ -100,20 +100,6 @@
 #
 #database_backups_to_keep = 1
 
-# Set this to any float value in megabytes for conduwuit to tell the
-# database engine that this much memory is available for database-related
-# caches.
-#
-# May be useful if you have significant memory to spare to increase
-# performance.
-#
-# Similar to the individual LRU caches, this is scaled up with your CPU
-# core count.
-#
-# This defaults to 128.0 + (64.0 * CPU core count).
-#
-#db_cache_capacity_mb = varies by system
-
 # Text which will be added to the end of the user's displayname upon
 # registration with a space before the text. In Conduit, this was the
 # lightning bolt emoji.
@@ -149,6 +135,34 @@
 #
 #cache_capacity_modifier = 1.0
 
+# Set this to any float value in megabytes for conduwuit to tell the
+# database engine that this much memory is available for database read
+# caches.
+#
+# May be useful if you have significant memory to spare to increase
+# performance.
+#
+# Similar to the individual LRU caches, this is scaled up with your CPU
+# core count.
+#
+# This defaults to 128.0 + (64.0 * CPU core count).
+#
+#db_cache_capacity_mb = varies by system
+
+# Set this to any float value in megabytes for conduwuit to tell the
+# database engine that this much memory is available for database write
+# caches.
+#
+# May be useful if you have significant memory to spare to increase
+# performance.
+#
+# Similar to the individual LRU caches, this is scaled up with your CPU
+# core count.
+#
+# This defaults to 48.0 + (4.0 * CPU core count).
+#
+#db_write_buffer_capacity_mb = varies by system
+
 # This item is undocumented. Please contribute documentation for it.
 #
 #pdu_cache_capacity = varies by system