r22142: add mention of the Vista performance fixes

1 files changed, 23 insertions, 1 deletions

diff --git a/WHATSNEW.txt b/WHATSNEW.txt
index c6de79d16b2..592bdb254a3 100644
--- a/WHATSNEW.txt
+++ b/WHATSNEW.txt
@@ -25,7 +25,8 @@ Major features included in the 3.0.25 code base include:
   o Support for passing Windows security descriptors to a VFS 
     plug-in allowing for multiple Unix ACL implements to running side 
     by side on the Same server.
-  o Improved compatibility with Windows Vista clients.
+  o Improved compatibility with Windows Vista clients including 
+    improved read performance with Linux servers.
   o Man pages for VFS plug-ins.
 
 
@@ -70,6 +71,27 @@ which means it is now possible to support multiple ACL implementations
 on the same server including NFSv4 and GPFS ACLs.
 
 
+VFS ReadAhead Plugin
+====================
+
+Windows Vista introduces pipe-lined read support for improved 
+performance when transferring files.  The new vfs_readahead plugin
+allows Linux file servers to utilize additional Kernel buffers
+for caching files in order to avoid Disk I/O wait time when serving
+Vista clients.  If you experience poor read performance between 
+Linux servers and Vista clients, please test the vfs_readahead
+module by adding the following lines to the share definition
+in smb.conf:
+
+[file_share]
+	vfs objects = readahead
+	readahead:length = 1M
+
+Note that this plugin will result in additional RAM requirements
+due to the increased amount of kernel buffer caches used by smbd.
+Please refer to vfs_readahead(8) for more information.
+
+
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 Changes
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