[write-beind] why we don't cache if length of data can not be divided by 4096.

["LI Daobing" <lidaobing@xxxxxxxxx>]

Hello,

a code in write-behind.c, function wb_writev:
// begin
  if ((file->size >= conf->aggregate_size) ||
      (iov_length (vector, count) % 4096)) {
    wb_sync (wb_frame, file);
  }
// end

Why we don't cache(or aggregate) data, if the length of the data can
not be divided by 4096?

Any reason for this decision?

Thanks,
LI Daobing