diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/PerformanceEvaluation.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/PerformanceEvaluation.java
index 16ea209e1fd..24586d7f82c 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/PerformanceEvaluation.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/PerformanceEvaluation.java
@@ -374,6 +374,7 @@ public class PerformanceEvaluation extends Configured implements Tool {
     family.setDataBlockEncoding(opts.blockEncoding);
     family.setCompressionType(opts.compression);
     family.setBloomFilterType(opts.bloomType);
+    family.setBlocksize(opts.blockSize);
     if (opts.inMemoryCF) {
       family.setInMemory(true);
     }
@@ -610,6 +611,7 @@ public class PerformanceEvaluation extends Configured implements Tool {
     String splitPolicy = null;
     Compression.Algorithm compression = Compression.Algorithm.NONE;
     BloomType bloomType = BloomType.ROW;
+    int blockSize = HConstants.DEFAULT_BLOCKSIZE;
     DataBlockEncoding blockEncoding = DataBlockEncoding.NONE;
     boolean valueRandom = false;
     boolean valueZipf = false;
@@ -652,6 +654,7 @@ public class PerformanceEvaluation extends Configured implements Tool {
       this.blockEncoding = that.blockEncoding;
       this.filterAll = that.filterAll;
       this.bloomType = that.bloomType;
+      this.blockSize = that.blockSize;
       this.valueRandom = that.valueRandom;
       this.valueZipf = that.valueZipf;
       this.valueSize = that.valueSize;
@@ -806,6 +809,10 @@ public class PerformanceEvaluation extends Configured implements Tool {
       this.bloomType = bloomType;
     }
 
+    public void setBlockSize(int blockSize) {
+      this.blockSize = blockSize;
+    }
+
     public void setBlockEncoding(DataBlockEncoding blockEncoding) {
       this.blockEncoding = blockEncoding;
     }
@@ -922,6 +929,10 @@ public class PerformanceEvaluation extends Configured implements Tool {
       return bloomType;
     }
 
+    public int getBlockSize() {
+      return blockSize;
+    }
+
     public boolean isOneCon() {
       return oneCon;
     }
@@ -1828,6 +1839,7 @@ public class PerformanceEvaluation extends Configured implements Tool {
         "Default: opts.perClientRunRows / 10 = " + DEFAULT_OPTS.getPerClientRunRows()/10);
     System.err.println(" multiGet        Batch gets together into groups of N. Only supported " +
         "by randomRead. Default: disabled");
+    System.err.println(" blockSize       Blocksize to use when writing out hfiles. ");
     System.err.println(" addColumns      Adds columns to scans/gets explicitly. Default: true");
     System.err.println(" replicas        Enable region replica testing. Defaults: 1.");
     System.err.println(" splitPolicy     Specify a custom RegionSplitPolicy for the table.");
@@ -2016,6 +2028,11 @@ public class PerformanceEvaluation extends Configured implements Tool {
         continue;
       }
 
+      final String blockSize = "--blockSize=";
+      if(cmd.startsWith(blockSize) ) {
+        opts.blockSize = Integer.parseInt(cmd.substring(blockSize.length()));
+      }
+
       final String valueSize = "--valueSize=";
       if (cmd.startsWith(valueSize)) {
         opts.valueSize = Integer.parseInt(cmd.substring(valueSize.length()));