Fix an issue where specifying both max client and server outgoing UDP throttles would cause client throttles to be lower than expected when total requests exceeded the scene limit.

This was because specifying a max client throttle would always request the max from the parent server throttle, no matter the actual total requests on the client throttle.
This would lead to a lower server multiplier than expected.
This change also adds a 'target' column to the "show throttles" output that shows the target rate (as set by client) if adaptive throttles is active.
This commit also re-adds the functionality lost in recent 5c1a1458 to set a max client throttle when adaptive is active.
This commit also adds TestClientThrottlePerClientAndRegionLimited and TestClientThrottleAdaptiveNoLimit regression tests

6 files changed, 275 insertions, 66 deletions

diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPClient.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPClient.cs
index 6864d37..c768662 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPClient.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPClient.cs
@@ -229,7 +229,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             m_throttleClient 
                 = new AdaptiveTokenBucket(
                     string.Format("adaptive throttle for {0} in {1}", AgentID, server.Scene.Name), 
-                    parentThrottle, rates.Total, rates.AdaptiveThrottlesEnabled);
+                    parentThrottle, 0, rates.Total, rates.AdaptiveThrottlesEnabled);
 
             // Create an array of token buckets for this clients different throttle categories
             m_throttleCategories = new TokenBucket[THROTTLE_CATEGORY_COUNT];
@@ -247,7 +247,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 m_throttleCategories[i]
                     = new TokenBucket(
                         string.Format("{0} throttle for {1} in {2}", type, AgentID, server.Scene.Name), 
-                    m_throttleClient, rates.GetRate(type));
+                    m_throttleClient, rates.GetRate(type), 0);
             }
 
             // Default the retransmission timeout to one second
@@ -293,6 +293,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             m_info.assetThrottle = (int)m_throttleCategories[(int)ThrottleOutPacketType.Asset].DripRate;
             m_info.textureThrottle = (int)m_throttleCategories[(int)ThrottleOutPacketType.Texture].DripRate;
             m_info.totalThrottle = (int)m_throttleClient.DripRate;
+            m_info.targetThrottle = (int)m_throttleClient.TargetDripRate;
             m_info.maxThrottle = (int)m_throttleClient.MaxDripRate;
 
             return m_info;
@@ -441,28 +442,36 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             }
 
             // Update the token buckets with new throttle values
-            TokenBucket bucket;
+            if (m_throttleClient.AdaptiveEnabled)
+            {
+                long total = resend + land + wind + cloud + task + texture + asset;
+                m_throttleClient.TargetDripRate = total;
+            }
+            else
+            {
+                TokenBucket bucket;
 
-            bucket = m_throttleCategories[(int)ThrottleOutPacketType.Resend];
-            bucket.RequestedDripRate = resend;
+                bucket = m_throttleCategories[(int)ThrottleOutPacketType.Resend];
+                bucket.RequestedDripRate = resend;
 
-            bucket = m_throttleCategories[(int)ThrottleOutPacketType.Land];
-            bucket.RequestedDripRate = land;
+                bucket = m_throttleCategories[(int)ThrottleOutPacketType.Land];
+                bucket.RequestedDripRate = land;
 
-            bucket = m_throttleCategories[(int)ThrottleOutPacketType.Wind];
-            bucket.RequestedDripRate = wind;
+                bucket = m_throttleCategories[(int)ThrottleOutPacketType.Wind];
+                bucket.RequestedDripRate = wind;
 
-            bucket = m_throttleCategories[(int)ThrottleOutPacketType.Cloud];
-            bucket.RequestedDripRate = cloud;
+                bucket = m_throttleCategories[(int)ThrottleOutPacketType.Cloud];
+                bucket.RequestedDripRate = cloud;
 
-            bucket = m_throttleCategories[(int)ThrottleOutPacketType.Asset];
-            bucket.RequestedDripRate = asset;
+                bucket = m_throttleCategories[(int)ThrottleOutPacketType.Asset];
+                bucket.RequestedDripRate = asset;
 
-            bucket = m_throttleCategories[(int)ThrottleOutPacketType.Task];
-            bucket.RequestedDripRate = task;
+                bucket = m_throttleCategories[(int)ThrottleOutPacketType.Task];
+                bucket.RequestedDripRate = task;
 
-            bucket = m_throttleCategories[(int)ThrottleOutPacketType.Texture];
-            bucket.RequestedDripRate = texture;
+                bucket = m_throttleCategories[(int)ThrottleOutPacketType.Texture];
+                bucket.RequestedDripRate = texture;
+            }
 
             // Reset the packed throttles cached data
             m_packedThrottles = null;
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
index 610067e..64548f2 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
@@ -245,11 +245,6 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
         /// <summary>Bandwidth throttle for this UDP server</summary>
         public TokenBucket Throttle { get; private set; }
-
-        /// <summary>
-        /// Gets the maximum total drip rate allowed to all clients.
-        /// </summary>
-        public long MaxTotalDripRate { get { return Throttle.RequestedDripRate; } }
         
         /// <summary>Per client throttle rates enforced by this server</summary>
         /// <remarks>
@@ -452,7 +447,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 //                = new TokenBucket(
 //                    string.Format("server throttle bucket for {0}", Scene.Name), null, sceneThrottleBps);
 
-            Throttle = new TokenBucket("server throttle bucket", null, sceneThrottleBps);
+            Throttle = new TokenBucket("server throttle bucket", null, sceneThrottleBps, sceneThrottleBps);
 
             ThrottleRates = new ThrottleRates(configSource);
 
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServerCommands.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServerCommands.cs
index 52247ab..325b04a 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServerCommands.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServerCommands.cs
@@ -182,7 +182,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             ConsoleDisplayList cdl = new ConsoleDisplayList();
             cdl.AddRow("Adaptive throttles", m_udpServer.ThrottleRates.AdaptiveThrottlesEnabled);
 
-            long maxSceneDripRate = m_udpServer.MaxTotalDripRate;
+            long maxSceneDripRate = m_udpServer.Throttle.MaxDripRate;
             cdl.AddRow(
                 "Max scene throttle", 
                 maxSceneDripRate != 0 ? string.Format("{0} kbps", maxSceneDripRate * 8 / 1000) : "unset");
@@ -360,7 +360,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                             param, newValue, sp.Name, sp.IsChildAgent ? "child" : "root", m_udpServer.Scene.Name);
 
                         LLUDPClient udpClient = ((LLClientView)sp.ControllingClient).UDPClient;
-                        udpClient.FlowThrottle.Enabled = newValue;
+                        udpClient.FlowThrottle.AdaptiveEnabled = newValue;
                         //                        udpClient.FlowThrottle.MaxDripRate = 0;
                         //                        udpClient.FlowThrottle.AdjustedDripRate = 0;
                     }
@@ -426,7 +426,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                     LLUDPClient udpClient = ((LLClientView)sp.ControllingClient).UDPClient;
 
                     ConsoleDisplayList cdl = new ConsoleDisplayList();
-                    cdl.AddRow("Adaptive throttle", udpClient.FlowThrottle.Enabled);
+                    cdl.AddRow("Adaptive throttle", udpClient.FlowThrottle.AdaptiveEnabled);
                     cdl.AddRow("Max throttle", string.Format("{0} kbps", udpClient.FlowThrottle.RequestedDripRate * 8 / 1000));
 
                     m_console.Output(cdl.ToString());
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/Tests/ThrottleTests.cs b/OpenSim/Region/ClientStack/Linden/UDP/Tests/ThrottleTests.cs
index b80a485..7991996 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/Tests/ThrottleTests.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/Tests/ThrottleTests.cs
@@ -26,6 +26,7 @@
  */
 
 using System;
+using Nini.Config;
 using NUnit.Framework;
 using OpenMetaverse.Packets;
 using OpenSim.Framework;
@@ -67,7 +68,9 @@ namespace OpenSim.Region.ClientStack.LindenUDP.Tests
                     scene, udpServer, TestHelpers.ParseTail(0x1), TestHelpers.ParseTail(0x2), 123456);
 
             LLUDPClient udpClient = ((LLClientView)sp.ControllingClient).UDPClient;
-//            udpClient.ThrottleDebugLevel = 1;
+
+            udpServer.Throttle.DebugLevel = 1;
+            udpClient.ThrottleDebugLevel = 1;
 
             int resendBytes = 1000;
             int landBytes = 2000;
@@ -83,7 +86,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP.Tests
             ClientInfo ci = udpClient.GetClientInfo();
 
             // We expect this to be lower because of the minimum bound set by MTU
-            float totalBytes = LLUDPServer.MTU + landBytes + windBytes + cloudBytes + taskBytes + textureBytes + assetBytes;
+            int totalBytes = LLUDPServer.MTU + landBytes + windBytes + cloudBytes + taskBytes + textureBytes + assetBytes;
             Assert.AreEqual(LLUDPServer.MTU, ci.resendThrottle);
             Assert.AreEqual(landBytes, ci.landThrottle);
             Assert.AreEqual(windBytes, ci.windThrottle);
@@ -92,6 +95,66 @@ namespace OpenSim.Region.ClientStack.LindenUDP.Tests
             Assert.AreEqual(textureBytes, ci.textureThrottle);
             Assert.AreEqual(assetBytes, ci.assetThrottle);
             Assert.AreEqual(totalBytes, ci.totalThrottle);
+
+            Assert.AreEqual(0, ci.maxThrottle);
+        }
+
+        [Test]
+        public void TestClientThrottleAdaptiveNoLimit()
+        {
+            TestHelpers.InMethod();
+//            TestHelpers.EnableLogging();
+
+            Scene scene = new SceneHelpers().SetupScene();
+
+            IniConfigSource ics = new IniConfigSource();
+            IConfig config = ics.AddConfig("ClientStack.LindenUDP");
+            config.Set("enable_adaptive_throttles", true);
+            TestLLUDPServer udpServer = ClientStackHelpers.AddUdpServer(scene, ics);
+
+            ScenePresence sp 
+                = ClientStackHelpers.AddChildClient(
+                    scene, udpServer, TestHelpers.ParseTail(0x1), TestHelpers.ParseTail(0x2), 123456);
+
+            LLUDPClient udpClient = ((LLClientView)sp.ControllingClient).UDPClient;
+
+            udpServer.Throttle.DebugLevel = 1;
+            udpClient.ThrottleDebugLevel = 1;
+
+            // Total is 28000
+            int resendBytes = 10000;
+            int landBytes = 20000;
+            int windBytes = 30000;
+            int cloudBytes = 40000;
+            int taskBytes = 50000;
+            int textureBytes = 60000;
+            int assetBytes = 70000;
+
+            SetThrottles(
+                udpClient, resendBytes, landBytes, windBytes, cloudBytes, taskBytes, textureBytes, assetBytes);
+
+            ClientInfo ci = udpClient.GetClientInfo();
+
+            // We expect individual throttle changes to currently have no effect under adaptive, since this is managed
+            // purely by that throttle.  However, we expect the max to change.
+            // XXX: At the moment we check against defaults, but at some point there should be a better test to 
+            // active see change over time.
+            ThrottleRates defaultRates = udpServer.ThrottleRates;
+
+            // Current total is 66750
+            int totalBytes = defaultRates.Resend + defaultRates.Land + defaultRates.Wind + defaultRates.Cloud + defaultRates.Task + defaultRates.Texture + defaultRates.Asset;
+            int totalMaxBytes = resendBytes + landBytes + windBytes + cloudBytes + taskBytes + textureBytes + assetBytes;
+
+            Assert.AreEqual(0, ci.maxThrottle);
+            Assert.AreEqual(totalMaxBytes, ci.targetThrottle);
+            Assert.AreEqual(defaultRates.Resend, ci.resendThrottle);
+            Assert.AreEqual(defaultRates.Land, ci.landThrottle);
+            Assert.AreEqual(defaultRates.Wind, ci.windThrottle);
+            Assert.AreEqual(defaultRates.Cloud, ci.cloudThrottle);
+            Assert.AreEqual(defaultRates.Task, ci.taskThrottle);
+            Assert.AreEqual(defaultRates.Texture, ci.textureThrottle);
+            Assert.AreEqual(defaultRates.Asset, ci.assetThrottle);
+            Assert.AreEqual(totalBytes, ci.totalThrottle);
         }
 
         /// <summary>
@@ -238,6 +301,101 @@ namespace OpenSim.Region.ClientStack.LindenUDP.Tests
             Assert.AreEqual(totalBytes, ci.totalThrottle);
         }
 
+        [Test]
+        public void TestClientThrottlePerClientAndRegionLimited()
+        {
+            TestHelpers.InMethod();
+            //TestHelpers.EnableLogging();
+
+            int resendBytes = 4000;
+            int landBytes = 6000;
+            int windBytes = 8000;
+            int cloudBytes = 10000;
+            int taskBytes = 12000;
+            int textureBytes = 14000;
+            int assetBytes = 16000;
+
+            // current total 70000
+            int totalBytes = resendBytes + landBytes + windBytes + cloudBytes + taskBytes + textureBytes + assetBytes;
+
+            Scene scene = new SceneHelpers().SetupScene();
+            TestLLUDPServer udpServer = ClientStackHelpers.AddUdpServer(scene);
+            udpServer.ThrottleRates.Total = (int)(totalBytes * 1.1);
+            udpServer.Throttle.RequestedDripRate = (int)(totalBytes * 1.5);
+
+            ScenePresence sp1 
+                = ClientStackHelpers.AddChildClient(
+                    scene, udpServer, TestHelpers.ParseTail(0x1), TestHelpers.ParseTail(0x2), 123456);
+
+            LLUDPClient udpClient1 = ((LLClientView)sp1.ControllingClient).UDPClient;
+            udpClient1.ThrottleDebugLevel = 1;
+
+            SetThrottles(
+                udpClient1, resendBytes, landBytes, windBytes, cloudBytes, taskBytes, textureBytes, assetBytes);
+
+            {
+                ClientInfo ci = udpClient1.GetClientInfo();
+               
+                            //                            Console.WriteLine(
+                            //                                "Resend={0}, Land={1}, Wind={2}, Cloud={3}, Task={4}, Texture={5}, Asset={6}, TOTAL = {7}", 
+                            //                                ci.resendThrottle, ci.landThrottle, ci.windThrottle, ci.cloudThrottle, ci.taskThrottle, ci.textureThrottle, ci.assetThrottle, ci.totalThrottle);
+
+                Assert.AreEqual(resendBytes, ci.resendThrottle);
+                Assert.AreEqual(landBytes, ci.landThrottle);
+                Assert.AreEqual(windBytes, ci.windThrottle);
+                Assert.AreEqual(cloudBytes, ci.cloudThrottle);
+                Assert.AreEqual(taskBytes, ci.taskThrottle);
+                Assert.AreEqual(textureBytes, ci.textureThrottle);
+                Assert.AreEqual(assetBytes, ci.assetThrottle);
+                Assert.AreEqual(totalBytes, ci.totalThrottle);
+            }
+
+            // Now add another client
+            ScenePresence sp2
+                = ClientStackHelpers.AddChildClient(
+                    scene, udpServer, TestHelpers.ParseTail(0x10), TestHelpers.ParseTail(0x20), 123457);
+
+            LLUDPClient udpClient2 = ((LLClientView)sp2.ControllingClient).UDPClient;
+            udpClient2.ThrottleDebugLevel = 1;
+
+            SetThrottles(
+                udpClient2, resendBytes, landBytes, windBytes, cloudBytes, taskBytes, textureBytes, assetBytes);
+
+            {
+                ClientInfo ci = udpClient1.GetClientInfo();
+            
+//                Console.WriteLine(
+//                    "Resend={0}, Land={1}, Wind={2}, Cloud={3}, Task={4}, Texture={5}, Asset={6}, TOTAL = {7}", 
+//                    ci.resendThrottle, ci.landThrottle, ci.windThrottle, ci.cloudThrottle, ci.taskThrottle, ci.textureThrottle, ci.assetThrottle, ci.totalThrottle);
+            
+                Assert.AreEqual(resendBytes * 0.75, ci.resendThrottle);
+                Assert.AreEqual(landBytes * 0.75, ci.landThrottle);
+                Assert.AreEqual(windBytes * 0.75, ci.windThrottle);
+                Assert.AreEqual(cloudBytes * 0.75, ci.cloudThrottle);
+                Assert.AreEqual(taskBytes * 0.75, ci.taskThrottle);
+                Assert.AreEqual(textureBytes * 0.75, ci.textureThrottle);
+                Assert.AreEqual(assetBytes * 0.75, ci.assetThrottle);
+                Assert.AreEqual(totalBytes * 0.75, ci.totalThrottle);
+            }
+
+            {
+                ClientInfo ci = udpClient2.GetClientInfo();
+
+//                Console.WriteLine(
+//                    "Resend={0}, Land={1}, Wind={2}, Cloud={3}, Task={4}, Texture={5}, Asset={6}, TOTAL = {7}", 
+//                    ci.resendThrottle, ci.landThrottle, ci.windThrottle, ci.cloudThrottle, ci.taskThrottle, ci.textureThrottle, ci.assetThrottle, ci.totalThrottle);
+
+                Assert.AreEqual(resendBytes * 0.75, ci.resendThrottle);
+                Assert.AreEqual(landBytes * 0.75, ci.landThrottle);
+                Assert.AreEqual(windBytes * 0.75, ci.windThrottle);
+                Assert.AreEqual(cloudBytes * 0.75, ci.cloudThrottle);
+                Assert.AreEqual(taskBytes * 0.75, ci.taskThrottle);
+                Assert.AreEqual(textureBytes * 0.75, ci.textureThrottle);
+                Assert.AreEqual(assetBytes * 0.75, ci.assetThrottle);
+                Assert.AreEqual(totalBytes * 0.75, ci.totalThrottle);
+            }
+        }
+
         private void SetThrottles(
             LLUDPClient udpClient, int resendBytes, int landBytes, int windBytes, int cloudBytes, int taskBytes, int textureBytes, int assetBytes)
         {
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/ThrottleRates.cs b/OpenSim/Region/ClientStack/Linden/UDP/ThrottleRates.cs
index e5bae6e..dd15cc7 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/ThrottleRates.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/ThrottleRates.cs
@@ -72,6 +72,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             {
                 IConfig throttleConfig = config.Configs["ClientStack.LindenUDP"];
 
+                // Current default total is 66750
                 Resend = throttleConfig.GetInt("resend_default", 6625);
                 Land = throttleConfig.GetInt("land_default", 9125);
                 Wind = throttleConfig.GetInt("wind_default", 1750);
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/TokenBucket.cs b/OpenSim/Region/ClientStack/Linden/UDP/TokenBucket.cs
index d696265..e0633d3 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/TokenBucket.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/TokenBucket.cs
@@ -113,36 +113,65 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         /// The speed limit of this bucket in bytes per second. This is the
         /// number of tokens that are added to the bucket per quantum
         /// </summary>
-        /// <remarks>Tokens are added to the bucket any time 
+        /// <remarks>
+        /// RequestedDripRate can never be above MaxDripRate.
+        /// Tokens are added to the bucket any time 
         /// <seealso cref="RemoveTokens"/> is called, at the granularity of
         /// the system tick interval (typically around 15-22ms)</remarks>
         protected Int64 m_dripRate;
         public virtual Int64 RequestedDripRate
         {
             get { return (m_dripRate == 0 ? TotalDripRequest : m_dripRate); }
-            set {
-                m_dripRate = (value < 0 ? 0 : value);
-                m_burstRate = (Int64)((double)m_dripRate * m_quantumsPerBurst);
+            set 
+            {
+                if (value <= 0)
+                    m_dripRate = 0;
+                else if (MaxDripRate > 0 && value > MaxDripRate)
+                    m_dripRate = MaxDripRate;
+                else
+                    m_dripRate = value;
+
                 TotalDripRequest = m_dripRate;
+                m_burstRate = (Int64)((double)m_dripRate * m_quantumsPerBurst);
+
                 if (Parent != null)
-                    Parent.RegisterRequest(this,m_dripRate);
+                    Parent.RegisterRequest(this, m_dripRate);
             }
         }
 
+        /// <summary>
+        /// Gets the drip rate.
+        /// </summary>
+        /// <value>DripRate can never be above max.</value>
         public virtual Int64 DripRate
         {
-            get {
+            get 
+            {
                 if (Parent == null)
                     return Math.Min(RequestedDripRate, TotalDripRequest);
                 
                 double rate = (double)RequestedDripRate * Parent.DripRateModifier();
                 if (rate < m_minimumDripRate)
                     rate = m_minimumDripRate;
+                else if (MaxDripRate > 0 && rate > MaxDripRate)
+                    rate = MaxDripRate;
 
                 return (Int64)rate;
             }
         }
 
+        // <summary>
+        // The maximum rate for flow control. Drip rate can never be greater than this.
+        // </summary>
+//        protected Int64 m_maxDripRate;
+//        public Int64 MaxDripRate
+//        {
+//            get { return m_maxDripRate; }
+//            //get { return (m_maxDripRate == 0 ? TotalDripRequest : m_maxDripRate); }
+//            set { m_maxDripRate = (value == 0 ? 0 : Math.Max(value, m_minimumFlow)); }
+//        }
+        public Int64 MaxDripRate { get; set; }
+
         /// <summary>
         /// The current total of the requested maximum burst rates of 
         /// this bucket's children buckets.
@@ -161,12 +190,13 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         /// null if this is a root bucket</param>
         /// <param name="dripRate">Rate that the bucket fills, in bytes per
         /// second. If zero, the bucket always remains full</param>
-        public TokenBucket(string identifier, TokenBucket parent, Int64 dripRate) 
+        public TokenBucket(string identifier, TokenBucket parent, Int64 dripRate, Int64 maxDripRate) 
         {
             Identifier = identifier;
 
             Parent = parent;
             RequestedDripRate = dripRate;
+            MaxDripRate = maxDripRate;
             // TotalDripRequest = dripRate; // this will be overwritten when a child node registers
             // MaxBurst = (Int64)((double)dripRate * m_quantumsPerBurst);
             m_lastDrip = Util.EnvironmentTickCount();
@@ -184,7 +214,14 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         protected double DripRateModifier()
         {
             Int64 driprate = DripRate;
-            return driprate >= TotalDripRequest ? 1.0 : (double)driprate / (double)TotalDripRequest;
+            double modifier = driprate >= TotalDripRequest ? 1.0 : (double)driprate / (double)TotalDripRequest;
+
+//            if (DebugLevel > 0)
+//                m_log.DebugFormat(
+//                    "[TOKEN BUCKET]: Returning drip modifier {0}/{1} = {2} from {3}", 
+//                    driprate, TotalDripRequest, modifier, Identifier);
+
+            return modifier;
         }
 
         /// <summary>
@@ -215,7 +252,17 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             
             // Pass the new values up to the parent
             if (Parent != null)
-                Parent.RegisterRequest(this,Math.Min(RequestedDripRate, TotalDripRequest));
+            {
+                Int64 effectiveDripRate;
+
+                if (MaxDripRate > 0)
+                    effectiveDripRate = Math.Min(MaxDripRate, TotalDripRequest);
+                else
+                    effectiveDripRate = TotalDripRequest;
+
+                //Parent.RegisterRequest(this, Math.Min(RequestedDripRate, TotalDripRequest));
+                Parent.RegisterRequest(this, effectiveDripRate);
+            }
         }
 
         /// <summary>
@@ -309,61 +356,60 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
     public class AdaptiveTokenBucket : TokenBucket
     {
-        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);               
+
+        public bool AdaptiveEnabled { get; set; }
 
         /// <summary>
-        /// The minimum rate for flow control. Minimum drip rate is one
-        /// packet per second. Open the throttle to 15 packets per second
-        /// or about 160kbps.
+        /// Target drip rate for this bucket.
         /// </summary>
-        protected const Int64 m_minimumFlow = m_minimumDripRate * 15;
-
-        // <summary>
-        // The maximum rate for flow control. Drip rate can never be
-        // greater than this.
-        // </summary>
-        protected Int64 m_maxDripRate = 0;
-        public Int64 MaxDripRate
-        {
-            get { return (m_maxDripRate == 0 ? TotalDripRequest : m_maxDripRate); }
-            set { m_maxDripRate = (value == 0 ? 0 : Math.Max(value,m_minimumFlow)); }
+        /// <remarks>Usually set by the client.  If adaptive is enabled then throttles will increase until we reach this.</remarks>
+        public Int64 TargetDripRate 
+        { 
+            get { return m_targetDripRate; }
+            set { m_targetDripRate = Math.Max(0, value); }
         }
+        protected Int64 m_targetDripRate;
 
-        public bool Enabled { get; set; }
-        
         // <summary>
-        // 
+        // Adjust drip rate in response to network conditions. 
         // </summary>
         public virtual Int64 AdjustedDripRate
         {
             get { return m_dripRate; }
             set {
-                m_dripRate = OpenSim.Framework.Util.Clamp<Int64>(value,m_minimumFlow,MaxDripRate);
+                m_dripRate = OpenSim.Framework.Util.Clamp<Int64>(value, m_minimumFlow, TargetDripRate);
                 m_burstRate = (Int64)((double)m_dripRate * m_quantumsPerBurst);
                 if (Parent != null)
                     Parent.RegisterRequest(this, m_dripRate);
             }
         }
+                
+        /// <summary>
+        /// The minimum rate for flow control. Minimum drip rate is one
+        /// packet per second. Open the throttle to 15 packets per second
+        /// or about 160kbps.
+        /// </summary>
+        protected const Int64 m_minimumFlow = m_minimumDripRate * 15;
 
-        public AdaptiveTokenBucket(string identifier, TokenBucket parent, Int64 maxDripRate, bool enabled) 
-            : base(identifier, parent, maxDripRate)
+        public AdaptiveTokenBucket(string identifier, TokenBucket parent, Int64 dripRate, Int64 maxDripRate, bool enabled) 
+            : base(identifier, parent, dripRate, maxDripRate)
         {
-            Enabled = enabled;
+            AdaptiveEnabled = enabled;
 
-            if (Enabled)
+            if (AdaptiveEnabled)
             {
 //                m_log.DebugFormat("[TOKENBUCKET]: Adaptive throttle enabled");
-                MaxDripRate = maxDripRate;
                 AdjustedDripRate = m_minimumFlow;
             }
         }
                 
         // <summary>
-        // 
+        // Reliable packets sent to the client for which we never received an ack adjust the drip rate down.
         // </summary>
         public void ExpirePackets(Int32 count)
         {
-            if (Enabled)
+            if (AdaptiveEnabled)
             {
                 if (DebugLevel > 0)
                     m_log.WarnFormat(
@@ -375,12 +421,12 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         }
 
         // <summary>
-        // 
+        // Reliable packets acked by the client adjust the drip rate up.
         // </summary>
         public void AcknowledgePackets(Int32 count)
         {
-            if (Enabled)
+            if (AdaptiveEnabled)
                 AdjustedDripRate = AdjustedDripRate + count;
         }
     }
-}
+}
\ No newline at end of file