3 files changed, 19 insertions, 4 deletions
diff --git a/src/policy/fees.cpp b/src/policy/fees.cpp
index eb6e9cc8bb..e139b06c72 100644
--- a/src/policy/fees.cpp
+++ b/src/policy/fees.cpp
@@ -4,6 +4,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "policy/fees.h"
+#include "policy/policy.h"
 
 #include "amount.h"
 #include "primitives/transaction.h"
@@ -504,7 +505,7 @@ CFeeRate CBlockPolicyEstimator::estimateFee(int confTarget)
     return CFeeRate(median);
 }
 
-CFeeRate CBlockPolicyEstimator::estimateSmartFee(int confTarget, int *answerFoundAtTarget)
+CFeeRate CBlockPolicyEstimator::estimateSmartFee(int confTarget, int *answerFoundAtTarget, const CTxMemPool *pool)
 {
     if (answerFoundAtTarget)
         *answerFoundAtTarget = confTarget;
@@ -520,6 +521,11 @@ CFeeRate CBlockPolicyEstimator::estimateSmartFee(int confTarget, int *answerFoun
     if (answerFoundAtTarget)
         *answerFoundAtTarget = confTarget - 1;
 
+    // If mempool is limiting txs , return at least the min fee from the mempool
+    CAmount minPoolFee = pool->GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFeePerK();
+    if (minPoolFee > 0 && minPoolFee > median)
+        return CFeeRate(minPoolFee);
+
     if (median < 0)
         return CFeeRate(0);
 
@@ -535,7 +541,7 @@ double CBlockPolicyEstimator::estimatePriority(int confTarget)
     return priStats.EstimateMedianVal(confTarget, SUFFICIENT_PRITXS, MIN_SUCCESS_PCT, true, nBestSeenHeight);
 }
 
-double CBlockPolicyEstimator::estimateSmartPriority(int confTarget, int *answerFoundAtTarget)
+double CBlockPolicyEstimator::estimateSmartPriority(int confTarget, int *answerFoundAtTarget, const CTxMemPool *pool)
 {
     if (answerFoundAtTarget)
         *answerFoundAtTarget = confTarget;
@@ -543,6 +549,11 @@ double CBlockPolicyEstimator::estimateSmartPriority(int confTarget, int *answerF
     if (confTarget <= 0 || (unsigned int)confTarget > priStats.GetMaxConfirms())
         return -1;
 
+    // If mempool is limiting txs, no priority txs are allowed
+    CAmount minPoolFee = pool->GetMinFee(GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFeePerK();
+    if (minPoolFee > 0)
+        return INF_PRIORITY;
+
     double median = -1;
     while (median < 0 && (unsigned int)confTarget <= priStats.GetMaxConfirms()) {
         median = priStats.EstimateMedianVal(confTarget++, SUFFICIENT_PRITXS, MIN_SUCCESS_PCT, true, nBestSeenHeight);
@@ -551,6 +562,7 @@ double CBlockPolicyEstimator::estimateSmartPriority(int confTarget, int *answerF
     if (answerFoundAtTarget)
         *answerFoundAtTarget = confTarget - 1;
 
+
     return median;
 }
 
diff --git a/src/policy/fees.h b/src/policy/fees.h
index 07caa6e713..59e6bfbc06 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -15,6 +15,7 @@
 class CAutoFile;
 class CFeeRate;
 class CTxMemPoolEntry;
+class CTxMemPool;
 
 /** \class CBlockPolicyEstimator
  * The BlockPolicyEstimator is used for estimating the fee or priority needed
@@ -246,7 +247,7 @@ public:
      *  confTarget blocks. If no answer can be given at confTarget, return an
      *  estimate at the lowest target where one can be given.
      */
-    CFeeRate estimateSmartFee(int confTarget, int *answerFoundAtTarget);
+    CFeeRate estimateSmartFee(int confTarget, int *answerFoundAtTarget, const CTxMemPool *pool);
 
     /** Return a priority estimate */
     double estimatePriority(int confTarget);
@@ -255,7 +256,7 @@ public:
      *  confTarget blocks. If no answer can be given at confTarget, return an
      *  estimate at the lowest target where one can be given.
      */
-    double estimateSmartPriority(int confTarget, int *answerFoundAtTarget);
+    double estimateSmartPriority(int confTarget, int *answerFoundAtTarget, const CTxMemPool *pool);
 
     /** Write estimation data to a file */
     void Write(CAutoFile& fileout);
diff --git a/src/policy/policy.h b/src/policy/policy.h
index f269e8d476..c8d2c1a924 100644
--- a/src/policy/policy.h
+++ b/src/policy/policy.h
@@ -25,6 +25,8 @@ static const unsigned int MAX_STANDARD_TX_SIZE = 100000;
 static const unsigned int MAX_P2SH_SIGOPS = 15;
 /** The maximum number of sigops we're willing to relay/mine in a single tx */
 static const unsigned int MAX_STANDARD_TX_SIGOPS = MAX_BLOCK_SIGOPS/5;
+/** Default for -maxmempool, maximum megabytes of mempool memory usage */
+static const unsigned int DEFAULT_MAX_MEMPOOL_SIZE = 300;
 /**
  * Standard script verification flags that standard transactions will comply
  * with. However scripts violating these flags may still be present in valid