[didier <dgautheron@xxxxxxxx>]

Hi,
If there's no filter, aka if tree is null,  dissect_ip_tcp_options is 
not called and you don't get the same column info.

Unrelated question:
Is it safe to use a tvbuff after subdissectors have been called?

ie:
here is vgprof ouput for netbench_1.cap (no filter, load, exit ):
  %   cumulative   self              self     total
 time instructi  instruct    calls  Ki/call  Ki/call  name
  6.06  64424.00 64424.00     152310     0.00     0.00  vfprintf
  3.89 105758.00 41334.00    728484     0.00     0.00  _IO_default_xsputn
  3.89 147074.00 41316.00    939069     0.00     0.00 
check_offset_length_no_exception
  3.76 187058.00 39984.00  1098209     0.00     0.00  compute_offset_length
  3.71 226481.00 39423.00  1379835     0.00     0.00  gtk_type_is_a
  3.16 260071.00 33590.00      39725     0.00     0.00  strcmp
  2.45 286107.00 26036.00    867911     0.00     0.00 
ensure_contiguous_no_exception
  2.37 311267.00 25160.00    528480     0.00     0.00  strlen
  2.35 336304.00 25037.00    203041     0.00     0.00  _int_malloc
  1.88 356291.00 19987.00    437043     0.00     0.00  find_spec
  1.86 376029.00 19738.00    396866     0.00     0.00  strcasecmp
  1.86 395762.00 19733.00    256368     0.00     0.00  set_cell_contents
  1.69 413775.00 18013.00    857826     0.00     0.00  ensure_contiguous
  1.69 431707.00 17932.00    249171     0.00     0.00  strcpy

total  1 063 463.00

version with dissect_tcp calling col_str only if subdissectors don't 
clear col_info:
 time instructi  instruct    calls  Ki/call  Ki/call  name
  4.20  41316.00 41316.00     939069     0.00     0.00 
check_offset_length_no_exception
  4.07  81326.00 40010.00       98210     0.00     0.00  vfprintf
  4.06 121310.00 39984.00  1098209     0.00     0.00  compute_offset_length
  4.01 160778.00 39468.00  1380590     0.00     0.00  gtk_type_is_a
  3.41 194368.00 33590.00      39725     0.00     0.00  strcmp
  2.65 220404.00 26036.00    867911     0.00     0.00 
ensure_contiguous_no_exception
  2.54 245440.00 25036.00    203072     0.00     0.00  _int_malloc
  2.30 268107.00 22667.00    445241     0.00     0.00  _IO_default_xsputn
  2.01 287845.00 19738.00    396866     0.00     0.00  strcasecmp
  2.01 307578.00 19733.00    256368     0.00     0.00  set_cell_contents
  1.90 326311.00 18733.00    425269     0.00     0.00  strlen
  1.83 344324.00 18013.00    857826     0.00     0.00  ensure_contiguous
  1.82 362256.00 17932.00    249170     0.00     0.00  strcpy
  1.62 378225.00 15969.00      58567     0.00     0.00  strncpy

total 983 910.00

Didier