diff --git a/benchmark_test.go b/benchmark_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..5069b06536e15084cb7ae68d2d52792719ed4b30
--- /dev/null
+++ b/benchmark_test.go
@@ -0,0 +1,59 @@
+package chunk
+
+import (
+	"bytes"
+	"io"
+	"math/rand"
+	"testing"
+)
+
+type newSplitter func(io.Reader) Splitter
+
+type bencSpec struct {
+	size int
+	name string
+}
+
+var bSizes = []bencSpec{
+	{1 << 10, "1K"},
+	{1 << 20, "1M"},
+	{16 << 20, "16M"},
+	{100 << 20, "100M"},
+}
+
+func benchmarkChunker(b *testing.B, ns newSplitter) {
+	for _, s := range bSizes {
+		s := s
+		b.Run(s.name, func(b *testing.B) {
+			benchmarkChunkerSize(b, ns, s.size)
+		})
+	}
+}
+
+func benchmarkChunkerSize(b *testing.B, ns newSplitter, size int) {
+	rng := rand.New(rand.NewSource(1))
+	data := make([]byte, size)
+	rng.Read(data)
+
+	b.SetBytes(int64(size))
+	b.ReportAllocs()
+	b.ResetTimer()
+
+	var res uint64
+
+	for i := 0; i < b.N; i++ {
+		r := ns(bytes.NewReader(data))
+
+		for {
+			chunk, err := r.NextBytes()
+			if err != nil {
+				if err == io.EOF {
+					break
+				}
+				b.Fatal(err)
+			}
+			res = res + uint64(len(chunk))
+		}
+	}
+	Res = Res + res
+}
diff --git a/buzhash.go b/buzhash.go
index edfc4c03df6f955fcfee5e76faf9d6699254a5ba..099b723b183c3cf2d6ddf4d3b197bebfb1b59cad 100644
--- a/buzhash.go
+++ b/buzhash.go
@@ -28,6 +28,10 @@ func NewBuzhash(r io.Reader) *Buzhash {
 	}
 }
 
+func (b *Buzhash) Reader() io.Reader {
+	return b.r
+}
+
 func (b *Buzhash) NextBytes() ([]byte, error) {
 	if b.err != nil {
 		return nil, b.err
diff --git a/buzhash_test.go b/buzhash_test.go
index 8e2b166326532a39a31b5ba66c9b5c15896ab794..6e59d6be8c98c337ffed7133ea1ae6aedae33473 100644
--- a/buzhash_test.go
+++ b/buzhash_test.go
@@ -41,37 +41,16 @@ func TestBuzhashChunking(t *testing.T) {
 }
 
 func TestBuzhashChunkReuse(t *testing.T) {
-	newBuzhash := func(r io.Reader) cher {
+	newBuzhash := func(r io.Reader) Splitter {
 		return NewBuzhash(r)
 	}
 	testReuse(t, newBuzhash)
 }
 
-func BenchmarkBuzhash(b *testing.B) {
-	data := make([]byte, 1<<10)
-	util.NewTimeSeededRand().Read(data)
-
-	b.SetBytes(int64(len(data)))
-	b.ReportAllocs()
-	b.ResetTimer()
-
-	var res uint64
-
-	for i := 0; i < b.N; i++ {
-		r := NewBuzhash(bytes.NewReader(data))
-
-		for {
-			chunk, err := r.NextBytes()
-			if err != nil {
-				if err == io.EOF {
-					break
-				}
-				b.Fatal(err)
-			}
-			res = res + uint64(len(chunk))
-		}
-	}
-	Res = Res + res
+func BenchmarkBuzhash2(b *testing.B) {
+	benchmarkChunker(b, func(r io.Reader) Splitter {
+		return NewBuzhash(r)
+	})
 }
 
 func TestBuzhashBitsHash(t *testing.T) {
diff --git a/rabin_test.go b/rabin_test.go
index 9eb8c669390e1b22604f386c2383b67f6cc4cdab..857e97c2ca1ef528d75ed69970e1b73449feb2ba 100644
--- a/rabin_test.go
+++ b/rabin_test.go
@@ -39,13 +39,7 @@ func TestRabinChunking(t *testing.T) {
 	}
 }
 
-type cher interface {
-	NextBytes() ([]byte, error)
-}
-
-type newChunker func(io.Reader) cher
-
-func chunkData(t *testing.T, newC newChunker, data []byte) map[string]blocks.Block {
+func chunkData(t *testing.T, newC newSplitter, data []byte) map[string]blocks.Block {
 	r := newC(bytes.NewReader(data))
 
 	blkmap := make(map[string]blocks.Block)
@@ -66,7 +60,7 @@ func chunkData(t *testing.T, newC newChunker, data []byte) map[string]blocks.Blo
 	return blkmap
 }
 
-func testReuse(t *testing.T, cr newChunker) {
+func testReuse(t *testing.T, cr newSplitter) {
 	data := make([]byte, 1024*1024*16)
 	util.NewTimeSeededRand().Read(data)
 
@@ -87,7 +81,7 @@ func testReuse(t *testing.T, cr newChunker) {
 }
 
 func TestRabinChunkReuse(t *testing.T) {
-	newRabin := func(r io.Reader) cher {
+	newRabin := func(r io.Reader) Splitter {
 		return NewRabin(r, 256*1024)
 	}
 	testReuse(t, newRabin)
@@ -96,29 +90,7 @@ func TestRabinChunkReuse(t *testing.T) {
 var Res uint64
 
 func BenchmarkRabin(b *testing.B) {
-	const size = 1 << 10
-	data := make([]byte, size)
-	util.NewTimeSeededRand().Read(data)
-
-	b.SetBytes(size)
-	b.ReportAllocs()
-	b.ResetTimer()
-
-	var res uint64
-
-	for i := 0; i < b.N; i++ {
-		r := NewRabin(bytes.NewReader(data), 1024*256)
-
-		for {
-			chunk, err := r.NextBytes()
-			if err != nil {
-				if err == io.EOF {
-					break
-				}
-				b.Fatal(err)
-			}
-			res = res + uint64(len(chunk))
-		}
-	}
-	Res = Res + res
+	benchmarkChunker(b, func(r io.Reader) Splitter {
+		return NewRabin(r, 256<<10)
+	})
 }
diff --git a/splitting_test.go b/splitting_test.go
index f2de774421487b82c71a5b4e8ea38d0aaf446cf1..d6498fcbedcf7246531775ba2d5b324fb79d5770 100644
--- a/splitting_test.go
+++ b/splitting_test.go
@@ -6,7 +6,6 @@ import (
 	"testing"
 
 	u "github.com/ipfs/go-ipfs-util"
-	util "github.com/ipfs/go-ipfs-util"
 )
 
 func randBuf(t *testing.T, size int) []byte {
@@ -121,29 +120,7 @@ func (s *clipReader) Read(buf []byte) (int, error) {
 }
 
 func BenchmarkDefault(b *testing.B) {
-	const size = 1 << 10
-	data := make([]byte, size)
-	util.NewTimeSeededRand().Read(data)
-
-	b.SetBytes(size)
-	b.ReportAllocs()
-	b.ResetTimer()
-
-	var res uint64
-
-	for i := 0; i < b.N; i++ {
-		r := DefaultSplitter(bytes.NewReader(data))
-
-		for {
-			chunk, err := r.NextBytes()
-			if err != nil {
-				if err == io.EOF {
-					break
-				}
-				b.Fatal(err)
-			}
-			res = res + uint64(len(chunk))
-		}
-	}
-	Res = Res + res
+	benchmarkChunker(b, func(r io.Reader) Splitter {
+		return DefaultSplitter(r)
+	})
 }