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 53c126de097..d50bf6be610 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
@@ -371,6 +371,7 @@ 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);
     }
@@ -625,6 +626,7 @@ 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;
@@ -670,6 +672,7 @@ 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;
@@ -834,6 +837,10 @@ 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;
     }
@@ -950,6 +957,10 @@ public class PerformanceEvaluation extends Configured implements Tool {
       return bloomType;
     }
 
+    public int getBlockSize() {
+      return blockSize;
+    }
+
     public boolean isOneCon() {
       return oneCon;
     }
@@ -1881,8 +1892,9 @@ public class PerformanceEvaluation extends Configured implements Tool {
     System.err.println(" inmemory        Tries to keep the HFiles of the CF " +
       "inmemory as far as possible. Not guaranteed that reads are always served " +
       "from memory.  Default: false");
-    System.err.println(" bloomFilter      Bloom filter type, one of "
+    System.err.println(" bloomFilter     Bloom filter type, one of "
         + Arrays.toString(BloomType.values()));
+    System.err.println(" blockSize       Blocksize to use when writing out hfiles. ");
     System.err.println(" inmemoryCompaction  Makes the column family to do inmemory flushes/compactions. "
         + "Uses the CompactingMemstore");
     System.err.println(" addColumns      Adds columns to scans/gets explicitly. Default: true");
@@ -2084,6 +2096,11 @@ 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()));