Latency reduction all over:

- SSU: Reduce ack delay
- Streaming: Reduce min RTO and flusher delay
- Tunnels: Reduce GW batching time

apps/streaming/java/src/net/i2p/client/streaming/impl/Connection.java

@@ -85,7 +85,7 @@ class Connection {
     private long _lifetimeDupMessageReceived;
     
     public static final long MAX_RESEND_DELAY = 45*1000;
-    public static final long MIN_RESEND_DELAY = 2*1000;
+    public static final long MIN_RESEND_DELAY = 1000;
 
     /**
      *  Wait up to 5 minutes after disconnection so we can ack/close packets.

apps/streaming/java/src/net/i2p/client/streaming/impl/MessageOutputStream.java

@@ -50,7 +50,7 @@ class MessageOutputStream extends OutputStream {
      *  Since this is less than i2ptunnel's i2p.streaming.connectDelay default of 1000,
      *  we only wait 250 at the start. Guess that's ok, 1000 is too long anyway.
      */
-    private static final int DEFAULT_PASSIVE_FLUSH_DELAY = 250;
+    private static final int DEFAULT_PASSIVE_FLUSH_DELAY = 175;
 
 /****
     public MessageOutputStream(I2PAppContext ctx, DataReceiver receiver) {

history.txt

@@ -4,6 +4,10 @@
    - Include in update, use version in base dir too
    - Increase limits
    - Bug fixes
+ * Latency reduction all over:
+   - SSU: Reduce ack delay
+   - Streaming: Reduce min RTO and flusher delay
+   - Tunnels: Reduce GW batching time
  * UrlLauncher:
    - Configure browser with routerconsole.browser (ticket #1159)
    - Convert to ClientApp interface

router/java/src/net/i2p/router/transport/udp/ACKSender.java

@@ -28,7 +28,7 @@ class ACKSender implements Runnable {
     private static final long POISON_PS = -9999999999l;
     
     /** how frequently do we want to send ACKs to a peer? */
-    static final int ACK_FREQUENCY = 350;
+    static final int ACK_FREQUENCY = 250;
     
     public ACKSender(RouterContext ctx, UDPTransport transport) {
         _context = ctx;

router/java/src/net/i2p/router/tunnel/BatchedRouterPreprocessor.java

@@ -24,11 +24,11 @@ class BatchedRouterPreprocessor extends BatchedPreprocessor {
     /** This goes in router advanced config */
     public static final String PROP_ROUTER_BATCH_FREQUENCY = "router.batchFrequency";
     /** for client OBGWs only (our data) */
-    public static final int OB_CLIENT_BATCH_FREQ = 100;
+    public static final int OB_CLIENT_BATCH_FREQ = 75;
     /** for exploratory OBGWs only (our tunnel tests and build messages) */
-    public static final int OB_EXPL_BATCH_FREQ = 150;
+    public static final int OB_EXPL_BATCH_FREQ = 100;
     /** for IBGWs for efficiency (not our data) */
-    public static final int DEFAULT_BATCH_FREQUENCY = 250;
+    public static final int DEFAULT_BATCH_FREQUENCY = 175;
     
     /** for OBGWs */
     public BatchedRouterPreprocessor(RouterContext ctx, TunnelCreatorConfig cfg) {