Slow ethernet in linux

[ak_hepcat]

using netperf and multiple streams, courtesy of the wrapper script: https://github.com/akhepcat/BettererSpeedTest

Code:

qdisc is not enabled:
  root@p64:~# lsmod | grep ifb | wc -l
  0

  root@p64:~# BettererSpeedTest
  2016-04-29 10:29:38 Testing against speedtest (ipv4) with 20 simultaneous sessions while pinging oldspeedtest (30 seconds)
  ...............................
   Download:  942 mb/s
    Latency: (in msec, 31 pings, 0.00% packet loss)
        Min: 0.306
      10pct: 0.325
     Median: 0.772
        Avg: 1.032
      90pct: 1.970
        Max: 2.460
  ...................................
     Upload:  575 mb/s
    Latency: (in msec, 24 pings, 0.00% packet loss)
        Min: 0.414
      10pct: 0.424
     Median: 42.400
        Avg: 58.657
      90pct: 137.000
        Max: 253.000
 

And then I enable qdisc, via custom wrapper script:

Code:

  root@p64:~# tc qdisc show
  qdisc htb 1: dev eth0 root refcnt 2 r2q 625 default 11 direct_packets_stat 0 direct_qlen 1000
  qdisc fq_codel 8002: dev eth0 parent 1:11 limit 10240p flows 1024 quantum 300 target 5.0ms interval 100.0ms
  qdisc ingress ffff: dev eth0 parent ffff:fff1 ----------------
  qdisc htb 1: dev ifb0 root refcnt 2 r2q 625 default 11 direct_packets_stat 0 direct_qlen 32
  qdisc fq_codel 8001: dev ifb0 parent 1:11 limit 10240p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
 
 
  root@p64:~# BettererSpeedTest
  2016-04-29 10:31:54 Testing against speedtest (ipv4) with 20 simultaneous sessions while pinging oldspeedtest (30 seconds)
  ..............................
   Download:  505 mb/s
    Latency: (in msec, 31 pings, 0.00% packet loss)
        Min: 0.333
      10pct: 0.365
     Median: 0.457
        Avg: 0.626
      90pct: 0.546
        Max: 5.740
  ..............................
     Upload:  845 mb/s
    Latency: (in msec, 29 pings, 0.00% packet loss)
        Min: 0.368
      10pct: 0.416
     Median: 0.750
        Avg: 2.315
      90pct: 2.820
        Max: 26.500
 

as you can see, my queuing still needs some tweaking to get the download speeds to recover to pre-queuing speeds,
but the upload speeds are quite nice.