Reduce readahead further

Signed-off-by: tytydraco <tylernij@gmail.com>

ktweak

@@ -154,11 +154,11 @@ do
 	write "${queue}iostats" 0
 
 	# Reduce heuristic read-ahead in exchange for I/O latency
-	write "${queue}read_ahead_kb" 64
+	write "${queue}read_ahead_kb" 16
 
 	# Reduce the maximum number of I/O requests in exchange for latency
 	write "${queue}nr_requests" 64
 done
 
 # Always return success, even if the last write fails
-exit 0
+exit 0