read_sum_head(f_in, &sum);
if (fd_r >= 0 && size_r > 0) {
- mapbuf = map_file(fd_r, size_r, sum.blength);
+ OFF_T map_size = MAX(sum.blength * 2, 16*1024);
+ mapbuf = map_file(fd_r, size_r, map_size, sum.blength);
if (verbose > 2) {
rprintf(FINFO, "recv mapped %s of size %.0f\n",
safe_fname(fname_r), (double)size_r);