[Cerowrt-devel] pie testing

[Dave Taht <dave.taht@gmail.com>]

I have been really kind about waiting (nearly 2 years) for pie to
stabilize and the
final version to hit linux mainline. Admittedly the version as planned to
be implemented in cable modems is so very different as for me
to despair of getting comparable results, but...

Now that it is apparently stable, and cero seems stable...

 I'd appreciate some results using it
(with the default pie target of 20ms and with a target of 5ms) with tests like
rich's new stuff, and rrul... I'm particularly interested in DSL results.

pie was extensively simulated using ns2 models that I disagree with on
many points, but does appear to work fairly well for simple models of traffic,
which was what it was mostly tested against. On my todo list is to try
combining drr + pie or qfq + pie.

pie target 20ms:

root@comcast-gw:~# ./speedtest.sh
Testing against netperf.richb-hanover.com while pinging gstatic.com
(60 seconds in each direction)
............................................................
 Download:  24.6 Mbps
  Latency: (in msec, 61 pings, 0.00% packet loss)
      Min: 15.719
    10pct: 18.012
   Median: 22.916
      Avg: 26.091
    90pct: 41.447
      Max: 55.721
.............................................................
   Upload:  3.95 Mbps
  Latency: (in msec, 61 pings, 0.00% packet loss)
      Min: 17.539
    10pct: 22.938
   Median: 31.679
      Avg: 36.764
    90pct: 45.287
      Max: 145.407

root@comcast-gw:~# ./speedtest.sh -H snapon.lab.bufferbloat.net
Testing against snapon.lab.bufferbloat.net while pinging gstatic.com
(60 seconds in each direction)
............................................................
 Download:  27.61 Mbps
  Latency: (in msec, 61 pings, 0.00% packet loss)
      Min: 16.082
    10pct: 22.831
   Median: 30.295
      Avg: 29.515
    90pct: 35.582
      Max: 39.558
............................................................
   Upload:  4.13 Mbps
  Latency: (in msec, 61 pings, 0.00% packet loss)
      Min: 16.697
    10pct: 34.470
   Median: 44.720
      Avg: 45.103
    90pct: 54.880
      Max: 62.281

For direct comparison (not that I recommend a 20ms target for fq_codel!
pie and codel treat the target idea very differently! )

fq_codel target 20ms

root@comcast-gw:~# ./speedtest.sh -H snapon.lab.bufferbloat.net
Testing against snapon.lab.bufferbloat.net while pinging gstatic.com
(60 seconds in each direction)
............................................................
 Download:  27.97 Mbps
  Latency: (in msec, 61 pings, 0.00% packet loss)
      Min: 17.132
    10pct: 18.177
   Median: 21.482
      Avg: 21.786
    90pct: 24.725
      Max: 37.424
............................................................
   Upload:  4.13 Mbps
  Latency: (in msec, 61 pings, 0.00% packet loss)
      Min: 18.813
    10pct: 21.308
   Median: 24.863
      Avg: 24.777
    90pct: 27.931
      Max: 29.007


rrul test results for both of these are at:

http://snapon.lab.bufferbloat.net/~d/cerowrt-3.10.32-12/pie



-- 
Dave Täht

Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html