dpreed, thank you for response. I'm already using fq_codel with cerowrt and
I don't think it does what I want (or maybe I want too much :)

So the steps I've made:
flashed wndr3700v2 with cerowrt 3.10.50-1 then I've measured:

root@cerowrt:/usr/lib/CeroWrtScripts# sh betterspeedtest.sh -p wlan-si.net
-t 120
2014-11-20 12:18:34 Testing against netperf.bufferbloat.net (ipv4) with 5
simultaneous sessions while pinging wlan-si.net (120 seconds in each
direction)
.........................................................................................................................
 Download:  3.78 Mbps
  Latency: (in msec, 119 pings, 0.00% packet loss)
      Min: 13.077
    10pct: 251.522
   Median: 317.851
      Avg: 308.497
    90pct: 371.033
      Max: 376.132
............................................................................................................................
   Upload:  0.48 Mbps
  Latency: (in msec, 103 pings, 0.00% packet loss)
      Min: 12.278
    10pct: 12.727
   Median: 18.359
      Avg: 23.256
    90pct: 33.971
      Max: 180.303

Then I've put these commands:

uci set sqm.ge00.enabled=1
uci set sqm.ge00.download=3200
uci set sqm.ge00.qdisc=nfq_codel
uci commit sqm
reboot

And another measure:

root@cerowrt:/usr/lib/CeroWrtScripts# sh betterspeedtest.sh -p wlan-si.net
-t 120
2014-11-20 12:49:05 Testing against netperf.bufferbloat.net (ipv4) with 5
simultaneous sessions while pinging wlan-si.net (120 seconds in each
direction)
.........................................................................................................................
 Download:  2.74 Mbps
  Latency: (in msec, 121 pings, 0.00% packet loss)
      Min: 12.210
    10pct: 13.002
   Median: 15.077
      Avg: 15.095
    90pct: 16.968
      Max: 18.599
.............................................................................................................................
   Upload:  0.49 Mbps
  Latency: (in msec, 101 pings, 0.00% packet loss)
      Min: 12.255
    10pct: 12.684
   Median: 16.679
      Avg: 23.100
    90pct: 34.019
      Max: 170.173

The tests doesn't look bad, but the problem is I watch a video clip on
youtube and my sister starts torrent client, I can't watch anymore.

Cheers