* Start recording as a statistic the number of times we start blocking repetitive client requests for the same missing texture

* This is to maintain some visibility on the problem, since I removed the intentionally irritating log messages for this

OpenSim/Framework/Statistics/SimExtraStatsCollector.cs

@@ -42,6 +42,7 @@ namespace OpenSim.Framework.Statistics
         private long texturesInCache;        
         private long assetCacheMemoryUsage;
         private long textureCacheMemoryUsage;
+        private long blockedMissingTextureRequests;
         
         private long inventoryServiceRetrievalFailures;
         
@@ -50,6 +51,14 @@ namespace OpenSim.Framework.Statistics
         public long AssetCacheMemoryUsage { get { return assetCacheMemoryUsage; } }
         public long TextureCacheMemoryUsage { get { return textureCacheMemoryUsage; } }
 
+        /// <summary>
+        /// Number of persistent requests for missing textures we have started blocking from clients.  To some extent
+        /// this is just a temporary statistic to keep this problem in view - the root cause of this lies either
+        /// in a mishandling of the reply protocol, related to avatar appearance or may even originate in graphics
+        /// driver bugs on clients (though this seems less likely).
+        /// </summary>
+        public long BlockedMissingTextureRequests { get { return blockedMissingTextureRequests; } }
+        
         /// <summary>
         /// Number of known failures to retrieve avatar inventory from the inventory service.  This does not
         /// cover situations where the inventory service accepts the request but never returns any data, since
@@ -71,14 +80,20 @@ namespace OpenSim.Framework.Statistics
         
         public void AddTexture(AssetBase image)
         {
-            // Tedd: I added null check to avoid exception. Don't know if texturesInCache should ++ anyway?
             if (image.Data != null)
             {
                 texturesInCache++;
+                
+                // This could have been a pull stat, though there was originally a nebulous idea to measure flow rates
                 textureCacheMemoryUsage += image.Data.Length;
             }
         }  
         
+        public void AddBlockedMissingTextureRequest()
+        {
+            blockedMissingTextureRequests++;
+        }
+        
         public void AddInventoryServiceRetrievalFailure()
         {
             inventoryServiceRetrievalFailures++;
@@ -116,14 +131,22 @@ namespace OpenSim.Framework.Statistics
         public string Report()
         {    
             StringBuilder sb = new StringBuilder(Environment.NewLine);
-            sb.Append("ASSET CACHE STATISTICS");
+            sb.Append("ASSET STATISTICS");
             sb.Append(Environment.NewLine);            
             sb.Append(
                 string.Format(
-@"Asset   cache contains {0,6} assets   using {1,10:0.000}K
+@"Asset   cache contains {0,6} assets   using {1,10:0.000}K" + Environment.NewLine,
-Texture cache contains {2,6} textures using {3,10:0.000}K" + Environment.NewLine,
+                    AssetsInCache, AssetCacheMemoryUsage / 1024.0));
-                    AssetsInCache, AssetCacheMemoryUsage / 1024.0, 
+            
-                    TexturesInCache, TextureCacheMemoryUsage / 1024.0));
+            sb.Append(Environment.NewLine);
+            sb.Append("TEXTURE STATISTICS");
+            sb.Append(Environment.NewLine);            
+            sb.Append(
+                string.Format(
+@"Texture cache contains {0,6} textures using {1,10:0.000}K
+Blocked requests for missing textures: {2}" + Environment.NewLine,
+                    TexturesInCache, TextureCacheMemoryUsage / 1024.0,
+                    BlockedMissingTextureRequests));            
             
             sb.Append(Environment.NewLine);
             sb.Append("INVENTORY STATISTICS");

OpenSim/Region/Environment/Modules/Agent/TextureDownload/UserTextureDownloadService.cs

@@ -31,6 +31,7 @@ using libsecondlife;
 using log4net;
 using OpenSim.Framework;
 using OpenSim.Framework.Communications.Limit;
+using OpenSim.Framework.Statistics;
 using OpenSim.Region.Environment.Interfaces;
 using OpenSim.Region.Environment.Scenes;
 
@@ -125,10 +126,11 @@ namespace OpenSim.Region.Environment.Modules.Agent.TextureDownload
                         {
                             if (missingTextureLimitStrategy.IsFirstRefusal(e.RequestedAssetID))
                             {
+                                if (StatsManager.SimExtraStats != null)
+                                    StatsManager.SimExtraStats.AddBlockedMissingTextureRequest();
+                                
                                 // Commenting out this message for now as it causes too much noise with other 
                                 // debug messages.  
-                                // TODO: possibly record this as a statistic in the future
-                                //
 //                                m_log.DebugFormat(
 //                                    "[USER TEXTURE DOWNLOAD SERVICE]: Dropping requests for notified missing texture {0} for client {1} since we have received more than {2} requests",
 //                                    e.RequestedAssetID, m_client.AgentId, MAX_ALLOWED_TEXTURE_REQUESTS);

prebuild.xml

@@ -752,17 +752,20 @@
       <Reference name="System" localCopy="false"/>
       <Reference name="System.Xml"/>
       <Reference name="System.Drawing"/>
-	  <Reference name="System.Runtime.Remoting"/>
+	    <Reference name="System.Runtime.Remoting"/>
       <Reference name="libsecondlife.dll"/>
       <Reference name="Axiom.MathLib.dll"/>
       <Reference name="OpenSim.Framework"/>
       <Reference name="OpenSim.Data" />
       <Reference name="OpenSim.Framework.Console"/>
-      <Reference name="OpenSim.Region.Physics.Manager"/>
       <Reference name="OpenSim.Framework.Servers"/>
-	  <!-- Unit tests -->
+      <Reference name="OpenSim.Framework.Statistics"/>
-	  <Reference name="OpenSim.Tests.Common"/>
+      <Reference name="OpenSim.Region.Physics.Manager"/>
-	  <Reference name="nunit.framework.dll"/>
+
+      <!-- Unit tests -->
+      <Reference name="OpenSim.Tests.Common"/>
+      <Reference name="nunit.framework.dll"/>
+
       <!-- For scripting in funny languages by default -->
       <Reference name="Microsoft.JScript"/>
       <Reference name="XMLRPC.dll"/>
@@ -770,6 +773,7 @@
       <Reference name="OpenSim.Data.Base"/>
       <Reference name="Nini.dll" />
       <Reference name="log4net"/>
+
       <Files>
         <Match pattern="*.cs" recurse="true"/>
       </Files>