Add mention of sysctl(8) for IPC tuning on Linux.

diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 47b01bb4faccb08acdee14d662ce72fdf06c0cc8..1a86b5c9bb9242d9b6d6495e9576820156d53abe 100644 (file)
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -1,5 +1,5 @@
 
 
 
@@ -1305,7 +1305,7 @@ env PGOPTIONS='-c geqo=off' psql
     consistently across different systems; 
     linkend="sysvipc-parameters"> gives an overview. The methods to
     set them, however, vary; suggestions for some platforms are given
-    below. Be aware that you will probably have to reboot your
+    below. Be warned that it is often necessary to reboot your
     machine at least, possibly even recompile the kernel, to change these
     settings.
    
@@ -1596,6 +1596,22 @@ options         SEMMAP=256
         You could put these commands into a script run at boot-time.
        
 
+       
+        Alternatively, you can use
+        sysctl
+        8, if available, to
+        control these parameters.  Look for a file called
+        /etc/sysctl.conf and add lines like the
+        following to it:
+
+kernel.shmall = 134217728
+kernel.shmmax = 134217728
+
+        This file is usually processed at boot time, but
+        sysctl can also be called
+        explicitly later.
+       
+
        
         Other parameters are sufficiently sized for any application.
         If you want to see for yourself look into