Add note that some versions of OS X require SHMMAX to be an exact multiple

of 4096.  Also add comment explaining why we don't suggest using
/etc/sysctl.conf to avoid needing to edit /etc/rc.

diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 0e88a6c297bd24874a24ce4dc05ab3f21e95623d..2aabdb83780aef7a6f62cc7ce6f368eb0c0a6287 100644 (file)
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -1,5 +1,5 @@
 
 
 
@@ -879,14 +879,27 @@ sysctl -w kern.sysv.shmmni
 sysctl -w kern.sysv.shmseg
 sysctl -w kern.sysv.shmall
 
-        In OS X 10.3, these commands have been moved to /etc/rc
-        and must be edited there.  You'll need to reboot to make changes
-        take effect.  Note that /etc/rc is usually
-        overwritten by OS X updates (such as 10.3.6 to 10.3.7) so you
-        should expect to have to redo your editing after each update.
+        In OS X 10.3 and later, these commands have been moved to
+        /etc/rc and must be edited there.  Note that
+        /etc/rc is usually overwritten by OS X updates (such as
+        10.3.6 to 10.3.7) so you should expect to have to redo your editing
+        after each update.  In all versions, you'll need to reboot to make
+        changes take effect.  
        
+
+
+
        
         SHMALL is measured in 4KB pages on this platform.
+        Also note that some releases of OS X will reject attempts to
+        set SHMMAX to a value that isn't an exact multiple
+        of 4096.