[PATCH] cciss: read_ahead bumped to 1024

This patch changes our read_ahead to 1024.  This has been shown to increase
performance.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/block/cciss.c

@@ -115,7 +115,7 @@ static struct board_type products[] = {
 /*define how many times we will try a command because of bus resets */
 #define MAX_CMD_RETRIES 3
 
-#define READ_AHEAD 	 256
+#define READ_AHEAD 	 1024
 #define NR_CMDS		 384 /* #commands that can be outstanding */
 #define MAX_CTLR 8