message: Setting the default buffer size to 128kB.
  GitOrigin-RevId:
diff: @@ -33,7 +33,8 @@ FileInputStream::FileInputStream(int file_descriptor, int buffer_size) {
  if (buffer_size > 0) {
  buffer_size_ = buffer_size;
  } else {
  - buffer_size_ = 1024;
  + // On linux systems, 128kB is a good buffer size and used e.g. by cp.
  + buffer_size_ = 128 * 1024;
  }
  count_in_buffer_ = 0;
  count_backedup_ = 0;
  