diff --git a/unknow-server-bench/src/main/java/unknow/server/bench/BenchJaxb.java b/unknow-server-bench/src/main/java/unknow/server/bench/BenchJaxb.java
index 45bee18e..a1b57aa5 100644
--- a/unknow-server-bench/src/main/java/unknow/server/bench/BenchJaxb.java
+++ b/unknow-server-bench/src/main/java/unknow/server/bench/BenchJaxb.java
@@ -3,7 +3,6 @@
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.OutputStream;
 import java.io.Reader;
 import java.io.StringReader;
 
@@ -49,7 +48,7 @@ private static void bench(JAXBContext c) throws JAXBException, IOException {
 		}
 		if (!(o instanceof Complex))
 			throw new JAXBException(o.getClass().getName());
-		c.createMarshaller().marshal(o, DUMP);
+		c.createMarshaller().marshal(o, NullOutputStream.INSTANCE);
 	}
 
 	@Benchmark
@@ -66,18 +65,4 @@ public void reference() throws JAXBException, IOException {
 	public void moxy() throws JAXBException, IOException {
 		bench(MOXY);
 	}
-
-	private static final OutputStream DUMP = new OutputStream() {
-		@Override
-		public void write(int b) throws IOException { // OK
-		}
-
-		@Override
-		public void write(byte[] b) throws IOException { // OK
-		}
-
-		@Override
-		public void write(byte[] b, int off, int len) throws IOException { // OK
-		}
-	};
 }
diff --git a/unknow-server-bench/src/main/java/unknow/server/bench/EncoderDecoder.java b/unknow-server-bench/src/main/java/unknow/server/bench/EncoderDecoder.java
index eb6bb655..5348970f 100644
--- a/unknow-server-bench/src/main/java/unknow/server/bench/EncoderDecoder.java
+++ b/unknow-server-bench/src/main/java/unknow/server/bench/EncoderDecoder.java
@@ -33,4 +33,10 @@ public String charset() {
 		d.decode(b, c, true);
 		return c.flip().toString();
 	}
+
+	@Benchmark
+	public String string() {
+		byte[] bytes = DATA.getBytes(StandardCharsets.UTF_8);
+		return new String(bytes, StandardCharsets.UTF_8);
+	}
 }
diff --git a/unknow-server-bench/src/main/java/unknow/server/bench/Main.java b/unknow-server-bench/src/main/java/unknow/server/bench/Main.java
index cdef8425..8029c2f5 100644
--- a/unknow-server-bench/src/main/java/unknow/server/bench/Main.java
+++ b/unknow-server-bench/src/main/java/unknow/server/bench/Main.java
@@ -17,7 +17,7 @@
 
 public class Main {
 	public static void main(String[] args) throws Exception {
-		Options o = new OptionsBuilder().forks(1).measurementIterations(10).verbosity(VerboseMode.NORMAL).warmupIterations(5).build();
+		Options o = new OptionsBuilder().forks(1).measurementIterations(10).verbosity(VerboseMode.SILENT).warmupIterations(5).build();
 
 		try (PrintStream w = args.length > 0 ? new PrintStream(Files.newOutputStream(Paths.get(args[0])), false, StandardCharsets.UTF_8) : System.out) {
 			for (Class<?> c : Arrays.asList(EncoderDecoder.class, BenchJaxb.class, BenchDocument.class, BenchProtostuff.class)) {
diff --git a/unknow-server-bench/src/main/java/unknow/server/bench/NullOutputStream.java b/unknow-server-bench/src/main/java/unknow/server/bench/NullOutputStream.java
new file mode 100644
index 00000000..97c9080c
--- /dev/null
+++ b/unknow-server-bench/src/main/java/unknow/server/bench/NullOutputStream.java
@@ -0,0 +1,24 @@
+package unknow.server.bench;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+public class NullOutputStream extends OutputStream {
+	public static final NullOutputStream INSTANCE = new NullOutputStream();
+
+	private NullOutputStream() {
+	}
+
+	@Override
+	public void write(int b) throws IOException { // OK
+	}
+
+	@Override
+	public void write(byte[] b) throws IOException { // OK
+	}
+
+	@Override
+	public void write(byte[] b, int off, int len) throws IOException { // OK
+	}
+
+}
diff --git a/unknow-server-bench/src/main/java/unknow/server/bench/Time.java b/unknow-server-bench/src/main/java/unknow/server/bench/Time.java
new file mode 100644
index 00000000..c3628001
--- /dev/null
+++ b/unknow-server-bench/src/main/java/unknow/server/bench/Time.java
@@ -0,0 +1,16 @@
+package unknow.server.bench;
+
+import org.openjdk.jmh.annotations.Benchmark;
+
+public class Time {
+
+	@Benchmark
+	public long nanoTime() {
+		return System.nanoTime();
+	}
+
+	@Benchmark
+	public long currentMillies() {
+		return System.currentTimeMillis();
+	}
+}
diff --git a/unknow-server-jaxb/src/main/java/unknow/server/jaxb/NsCollector.java b/unknow-server-jaxb/src/main/java/unknow/server/jaxb/NsCollector.java
index d72cba82..3f71caad 100644
--- a/unknow-server-jaxb/src/main/java/unknow/server/jaxb/NsCollector.java
+++ b/unknow-server-jaxb/src/main/java/unknow/server/jaxb/NsCollector.java
@@ -172,8 +172,12 @@ public static final Map<String, String> buildNsMapping(Map<String, Integer> ns)
 		if (map.isEmpty())
 			map.put(it.next(), "");
 		int i = 0;
-		while (it.hasNext())
-			map.put(it.next(), prefix(i++));
+		while (it.hasNext()) {
+			String p = prefix(i++);
+			if (p.equals("xml") || p.equals("xmlns"))
+				p = prefix(i++);
+			map.put(it.next(), p);
+		}
 		return map;
 	}
 
@@ -196,7 +200,7 @@ public static final String prefix(int t) {
 		int i = t % PREFIX_FIRST.length;
 		sb.append(PREFIX_FIRST[i]);
 		t -= i;
-		while (t > PREFIX_OTHER.length) {
+		while (t >= PREFIX_OTHER.length) {
 			i = t % PREFIX_OTHER.length;
 			sb.append(PREFIX_OTHER[i]);
 			t -= i;
diff --git a/unknow-server-servlet/src/main/java/unknow/server/servlet/utils/PathTree.java b/unknow-server-servlet/src/main/java/unknow/server/servlet/utils/PathTree.java
index 36ff5326..3dfe7b47 100644
--- a/unknow-server-servlet/src/main/java/unknow/server/servlet/utils/PathTree.java
+++ b/unknow-server-servlet/src/main/java/unknow/server/servlet/utils/PathTree.java
@@ -51,7 +51,7 @@ private FilterChain tryFind(ServletRequestImpl req, PartNode last, String path,
 			if (n == null)
 				break;
 			if (l < 0) {
-				req.setPathInfo(i - 1);
+				req.setPathInfo(path.length());
 				return n.exact;
 			}
 			last = n;