From 5434e469868a198824df6198733e4fc57f72ce12 Mon Sep 17 00:00:00 2001
From: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: Tue, 16 Dec 2008 19:30:43 +0000
Subject: [PATCH] Add note to the shared memory sizing table about needing to
use page count in shared_buffers and wal_buffers, not size in bytes. Per
discussion.
---
doc/src/sgml/runtime.sgml | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index f40899e0d60..c48ffa57afa 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -1,4 +1,4 @@
-<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.422 2008/11/20 11:48:26 mha Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.423 2008/12/16 19:30:43 alvherre Exp $ -->
<chapter Id="runtime">
<title>Operating System Environment</title>
@@ -1124,6 +1124,16 @@ set semsys:seminfo_semmsl=32
</tbody>
</tgroup>
</table>
+
+ <note>
+ <para>
+ The multipliers for <varname>shared_buffers</> and
+ <varname>wal_buffers</> should be the number of buffers, not the
+ amount in bytes. To find out the number of shared or wal buffers, divide
+ the amount in bytes by <xref linkend="guc-block-size"> and
+ <xref linkend="guc-wal-block-size">, respectively.
+ </para>
+ </note>
</sect2>
--
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