Shrink tx hash cache from 512k to 130k (#7951)

Author: benaadams

src/Nethermind/Nethermind.Init/MemoryHintMan.cs

@@ -122,7 +122,7 @@ private void AssignPeersMemory(INetworkConfig networkConfig)
 
         private void AssignTxPoolMemory(ITxPoolConfig txPoolConfig)
         {
-            long hashCacheMemory = txPoolConfig.Size / 4L * 1024L * 128L;
+            long hashCacheMemory = txPoolConfig.Size / 1024L * 128L;
             if ((_remainingMemory * 0.05) < hashCacheMemory)
             {
                 hashCacheMemory = Math.Min((long)(_remainingMemory * 0.05), hashCacheMemory);

src/Nethermind/Nethermind.TxPool/MemoryAllowance.cs

@@ -5,7 +5,7 @@ namespace Nethermind.TxPool
 {
     public static class MemoryAllowance
     {
-        public static int MemPoolSize { get; set; } = 1 << 11;
-        public static int TxHashCacheSize { get; set; } = 1 << 19;
+        public static int MemPoolSize { get; set; } = 2_048;
+        public static int TxHashCacheSize { get; set; } = 131_072;
     }
 }