diff --git a/weed/command/filer.go b/weed/command/filer.go
index 82994b971..e9e3237df 100644
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -174,7 +174,7 @@ func (fo *FilerOptions) startFiler() {
 		Host:                  *fo.ip,
 		Port:                  uint32(*fo.port),
 		Cipher:                *fo.cipher,
-		SaveToFilerLimit:      *fo.saveToFilerLimit,
+		SaveToFilerLimit:      int64(*fo.saveToFilerLimit),
 		Filers:                peers,
 		ConcurrentUploadLimit: int64(*fo.concurrentUploadLimitMB) * 1024 * 1024,
 	})
diff --git a/weed/operation/buffer_pool.go b/weed/operation/buffer_pool.go
new file mode 100644
index 000000000..4003f7d70
--- /dev/null
+++ b/weed/operation/buffer_pool.go
@@ -0,0 +1,23 @@
+package operation
+
+import (
+	"github.com/valyala/bytebufferpool"
+	"sync/atomic"
+)
+
+var bufferCounter int64
+func GetBuffer() *bytebufferpool.ByteBuffer {
+	defer func() {
+		atomic.AddInt64(&bufferCounter, 1)
+		// println("+", bufferCounter)
+	}()
+	return bytebufferpool.Get()
+}
+
+func PutBuffer(buf *bytebufferpool.ByteBuffer) {
+	defer func() {
+		atomic.AddInt64(&bufferCounter, -1)
+		// println("-", bufferCounter)
+	}()
+	bytebufferpool.Put(buf)
+}
diff --git a/weed/operation/upload_content.go b/weed/operation/upload_content.go
index 9957a04cd..e891ae03b 100644
--- a/weed/operation/upload_content.go
+++ b/weed/operation/upload_content.go
@@ -19,7 +19,6 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util"
-	"github.com/valyala/bytebufferpool"
 )
 
 type UploadResult struct {
@@ -190,8 +189,8 @@ func doUploadData(uploadUrl string, filename string, cipher bool, data []byte, i
 }
 
 func upload_content(uploadUrl string, fillBufferFunction func(w io.Writer) error, filename string, isGzipped bool, originalDataSize int, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (*UploadResult, error) {
-	buf := bytebufferpool.Get()
-	defer bytebufferpool.Put(buf)
+	buf := GetBuffer()
+	defer PutBuffer(buf)
 	body_writer := multipart.NewWriter(buf)
 	h := make(textproto.MIMEHeader)
 	h.Set("Content-Disposition", fmt.Sprintf(`form-data; name="file"; filename="%s"`, fileNameEscaper.Replace(filename)))