scan method tests for openwrt

wifiscantest.lua

#!/usr/bin/env lua
require("iwinfo")
require("socket")

-- config
IFACES      = { 'wlan0', 'wlan1' }

SCANS       = 5   -- number of iterations for every scan method
PRESCANS    = 0   -- number of unaccounted scans to fill up buffers
WAIT_METHOD = 0   -- seconds of sleep before each method
WAIT_SCAN   = 0   -- seconds of sleep before each scan

METHODS = {
  iwinfo_lua_wext = function(iface) return #iwinfo.wext.scanlist(iface) end,
  iwinfo_lua_nl   = function(iface) return #iwinfo.nl80211.scanlist(iface) end,
  iwinfo_cli      = function(iface) return pread("iwinfo "..iface.." scan | grep Cell | wc -l") end,
  iw_cli          = function(iface) return pread("iw "..iface.." scan | egrep ^BSS | wc -l") end,
  iwlist_cli      = function(iface) return pread("iwlist "..iface.." scan | egrep Address: | wc -l") end,
}

-- helper functions
function pread(cmd)
  local f = io.popen(cmd)
  local o = f:read()
  f:close()
  return o
end

function sleep(t)
  socket.select(nil, nil, t)
end

-- main loop
for i,iface in ipairs(IFACES) do
  local typ = iwinfo.type(iface)
  local drv = pread("ls /sys/class/net/"..iface.."/device/driver/module/drivers/")
  print(
    '######',
    iface,
    iwinfo[typ].phyname(iface),
    iwinfo[typ].mode(iface),
    typ,
    drv,
    '\n'
  )
  for m,method in pairs(METHODS) do
    print("  ["..m.."]")
    sleep(WAIT_METHOD)
    -- prescan a few times to fill up buffers?
    for n=1,PRESCANS do method(iface) end
    -- scan and output stats
    for n=1,SCANS do
      sleep(WAIT_SCAN)
      local tstart = socket.gettime()
      local res = method(iface)
      local tend = socket.gettime()
      local tdelta = tend - tstart
      local out = string.format("  %02d    r: %02d    t: %1.2fs", n, res, tdelta)
      print(out)
    end
    print()
  end
end

wifiscantest_output.txt

######	wlan0	phy0	Client	nl80211	pci:ath9k	

  [iwinfo_lua_wext]
  01    r: 04    t: 1.69s
  02    r: 04    t: 1.77s
  03    r: 03    t: 1.76s
  04    r: 03    t: 1.76s
  05    r: 03    t: 1.77s

  [iwinfo_lua_nl]
  01    r: 03    t: 1.89s
  02    r: 00    t: 1.67s
  03    r: 00    t: 1.68s
  04    r: 00    t: 1.68s
  05    r: 00    t: 1.68s

  [iwlist_cli]
  01    r: 03    t: 1.74s
  02    r: 03    t: 1.80s
  03    r: 03    t: 2.01s
  04    r: 03    t: 1.73s
  05    r: 03    t: 1.86s

  [iw_cli]
  01    r: 04    t: 1.95s
  02    r: 04    t: 1.77s
  03    r: 04    t: 1.75s
  04    r: 04    t: 1.76s
  05    r: 04    t: 1.74s

  [iwinfo_cli]
  01    r: 04    t: 1.74s
  02    r: 04    t: 1.72s
  03    r: 04    t: 1.74s
  04    r: 05    t: 2.00s
  05    r: 05    t: 1.75s

######	wlan1	phy1	Client	nl80211	usb:ath9k_htc	

  [iwinfo_lua_wext]
  01    r: 19    t: 7.41s
  02    r: 21    t: 7.40s
  03    r: 21    t: 6.99s
  04    r: 22    t: 7.08s
  05    r: 23    t: 7.33s

  [iwinfo_lua_nl]
  01    r: 00    t: 7.31s
  02    r: 20    t: 26.53s
  03    r: 00    t: 6.96s
  04    r: 21    t: 26.40s
  05    r: 00    t: 6.87s

  [iwlist_cli]
  01    r: 21    t: 2.02s
  02    r: 21    t: 1.65s
  03    r: 21    t: 1.71s
  04    r: 20    t: 3.80s
  05    r: 22    t: 7.54s

  [iw_cli]
  01    r: 23    t: 7.25s
  02    r: 23    t: 6.95s