Revert the revert

Revert "Trying to hunt the CPU spikes recently experienced."

This reverts commit ac73e70293.

OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs

@@ -1615,6 +1615,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 {
                     IncomingPacket incomingPacket = null;
 
+                    /*
                     // HACK: This is a test to try and rate limit packet handling on Mono.
                     // If it works, a more elegant solution can be devised
                     if (Util.FireAndForgetCount() < 2)
@@ -1622,6 +1623,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                         //m_log.Debug("[LLUDPSERVER]: Incoming packet handler is sleeping");
                         Thread.Sleep(30);
                     }
+                     */
 
                     if (packetInbox.Dequeue(100, ref incomingPacket))
                     {