[tun] add a fasttun splice / testing harness

[dpeckett]

Test Complete. Summary Results:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.01  sec   698 MBytes   585 Mbits/sec  329            sender
[  5]   0.00-10.01  sec   697 MBytes   584 Mbits/sec                  receiver
[  7]   0.00-10.01  sec  1.06 GBytes   911 Mbits/sec  138            sender
[  7]   0.00-10.01  sec  1.06 GBytes   910 Mbits/sec                  receiver
[  9]   0.00-10.01  sec  1.06 GBytes   906 Mbits/sec  162            sender
[  9]   0.00-10.01  sec  1.05 GBytes   905 Mbits/sec                  receiver
[ 11]   0.00-10.01  sec   688 MBytes   577 Mbits/sec  278            sender
[ 11]   0.00-10.01  sec   688 MBytes   576 Mbits/sec                  receiver
[ 13]   0.00-10.01  sec   736 MBytes   617 Mbits/sec  221            sender
[ 13]   0.00-10.01  sec   736 MBytes   616 Mbits/sec                  receiver
[ 15]   0.00-10.01  sec  2.35 GBytes  2.02 Gbits/sec  155            sender
[ 15]   0.00-10.01  sec  2.35 GBytes  2.02 Gbits/sec                  receiver
[ 17]   0.00-10.01  sec   704 MBytes   590 Mbits/sec  243            sender
[ 17]   0.00-10.01  sec   704 MBytes   590 Mbits/sec                  receiver
[ 19]   0.00-10.01  sec   653 MBytes   547 Mbits/sec  251            sender
[ 19]   0.00-10.01  sec   652 MBytes   546 Mbits/sec                  receiver
[ 21]   0.00-10.01  sec  2.28 GBytes  1.96 Gbits/sec  155            sender
[ 21]   0.00-10.01  sec  2.28 GBytes  1.96 Gbits/sec                  receiver
[ 23]   0.00-10.01  sec  1018 MBytes   854 Mbits/sec  181            sender
[ 23]   0.00-10.01  sec  1018 MBytes   853 Mbits/sec                  receiver
[ 25]   0.00-10.01  sec  1.19 GBytes  1.02 Gbits/sec  160            sender
[ 25]   0.00-10.01  sec  1.18 GBytes  1.02 Gbits/sec                  receiver
[ 27]   0.00-10.01  sec  2.31 GBytes  1.99 Gbits/sec  105            sender
[ 27]   0.00-10.01  sec  2.31 GBytes  1.99 Gbits/sec                  receiver
[ 29]   0.00-10.01  sec  2.35 GBytes  2.02 Gbits/sec  147            sender
[ 29]   0.00-10.01  sec  2.35 GBytes  2.02 Gbits/sec                  receiver
[ 31]   0.00-10.01  sec  2.36 GBytes  2.03 Gbits/sec  186            sender
[ 31]   0.00-10.01  sec  2.36 GBytes  2.03 Gbits/sec                  receiver
[ 33]   0.00-10.01  sec   653 MBytes   548 Mbits/sec  192            sender
[ 33]   0.00-10.01  sec   653 MBytes   547 Mbits/sec                  receiver
[ 35]   0.00-10.01  sec  2.32 GBytes  1.99 Gbits/sec   75            sender
[ 35]   0.00-10.01  sec  2.32 GBytes  1.99 Gbits/sec                  receiver
[ 37]   0.00-10.01  sec  1.09 GBytes   934 Mbits/sec  153            sender
[ 37]   0.00-10.01  sec  1.09 GBytes   934 Mbits/sec                  receiver
[ 39]   0.00-10.01  sec  1.03 GBytes   883 Mbits/sec  248            sender
[ 39]   0.00-10.01  sec  1.03 GBytes   882 Mbits/sec                  receiver
[ 41]   0.00-10.01  sec   490 MBytes   411 Mbits/sec  304            sender
[ 41]   0.00-10.01  sec   490 MBytes   410 Mbits/sec                  receiver
[ 43]   0.00-10.01  sec  1.01 GBytes   866 Mbits/sec  181            sender
[ 43]   0.00-10.01  sec  1.01 GBytes   865 Mbits/sec                  receiver
[ 45]   0.00-10.01  sec   697 MBytes   584 Mbits/sec  187            sender
[ 45]   0.00-10.01  sec   697 MBytes   584 Mbits/sec                  receiver
[ 47]   0.00-10.01  sec  2.34 GBytes  2.00 Gbits/sec  170            sender
[ 47]   0.00-10.01  sec  2.33 GBytes  2.00 Gbits/sec                  receiver
[ 49]   0.00-10.01  sec   717 MBytes   601 Mbits/sec  247            sender
[ 49]   0.00-10.01  sec   716 MBytes   601 Mbits/sec                  receiver
[ 51]   0.00-10.01  sec  1.07 GBytes   923 Mbits/sec  142            sender
[ 51]   0.00-10.01  sec  1.07 GBytes   922 Mbits/sec                  receiver
[ 53]   0.00-10.01  sec   567 MBytes   475 Mbits/sec  270            sender
[ 53]   0.00-10.01  sec   566 MBytes   474 Mbits/sec                  receiver
[ 55]   0.00-10.01  sec   596 MBytes   500 Mbits/sec  324            sender
[ 55]   0.00-10.01  sec   596 MBytes   499 Mbits/sec                  receiver
[ 57]   0.00-10.01  sec   654 MBytes   548 Mbits/sec  248            sender
[ 57]   0.00-10.01  sec   654 MBytes   548 Mbits/sec                  receiver
[ 59]   0.00-10.01  sec   462 MBytes   388 Mbits/sec  420            sender
[ 59]   0.00-10.01  sec   462 MBytes   387 Mbits/sec                  receiver
[ 61]   0.00-10.01  sec  2.32 GBytes  1.99 Gbits/sec  114            sender
[ 61]   0.00-10.01  sec  2.32 GBytes  1.99 Gbits/sec                  receiver
[ 63]   0.00-10.01  sec   771 MBytes   646 Mbits/sec  281            sender
[ 63]   0.00-10.01  sec   770 MBytes   646 Mbits/sec                  receiver
[ 65]   0.00-10.01  sec  2.37 GBytes  2.03 Gbits/sec  120            sender
[ 65]   0.00-10.01  sec  2.36 GBytes  2.03 Gbits/sec                  receiver
[ 67]   0.00-10.01  sec  2.32 GBytes  1.99 Gbits/sec  156            sender
[ 67]   0.00-10.01  sec  2.32 GBytes  1.99 Gbits/sec                  receiver
[ 69]   0.00-10.01  sec   724 MBytes   607 Mbits/sec  252            sender
[ 69]   0.00-10.01  sec   724 MBytes   606 Mbits/sec                  receiver
[ 71]   0.00-10.01  sec  1.05 GBytes   898 Mbits/sec  201            sender
[ 71]   0.00-10.01  sec  1.05 GBytes   898 Mbits/sec                  receiver
[ 73]   0.00-10.01  sec   682 MBytes   571 Mbits/sec  319            sender
[ 73]   0.00-10.01  sec   681 MBytes   571 Mbits/sec                  receiver
[ 75]   0.00-10.01  sec   653 MBytes   547 Mbits/sec  278            sender
[ 75]   0.00-10.01  sec   653 MBytes   547 Mbits/sec                  receiver
[ 77]   0.00-10.01  sec  1.07 GBytes   918 Mbits/sec  186            sender
[ 77]   0.00-10.01  sec  1.07 GBytes   918 Mbits/sec                  receiver
[ 79]   0.00-10.01  sec   740 MBytes   621 Mbits/sec  248            sender
[ 79]   0.00-10.01  sec   740 MBytes   620 Mbits/sec                  receiver
[ 81]   0.00-10.01  sec  2.31 GBytes  1.98 Gbits/sec  108            sender
[ 81]   0.00-10.01  sec  2.31 GBytes  1.98 Gbits/sec                  receiver
[ 83]   0.00-10.01  sec   995 MBytes   834 Mbits/sec  170            sender
[ 83]   0.00-10.01  sec   995 MBytes   834 Mbits/sec                  receiver
[ 85]   0.00-10.01  sec   696 MBytes   584 Mbits/sec  270            sender
[ 85]   0.00-10.01  sec   696 MBytes   583 Mbits/sec                  receiver
[ 87]   0.00-10.01  sec   729 MBytes   611 Mbits/sec  310            sender
[ 87]   0.00-10.01  sec   728 MBytes   611 Mbits/sec                  receiver
[ 89]   0.00-10.01  sec  2.32 GBytes  1.99 Gbits/sec  111            sender
[ 89]   0.00-10.01  sec  2.31 GBytes  1.99 Gbits/sec                  receiver
[ 91]   0.00-10.01  sec  2.33 GBytes  2.00 Gbits/sec  170            sender
[ 91]   0.00-10.01  sec  2.33 GBytes  2.00 Gbits/sec                  receiver
[ 93]   0.00-10.01  sec  2.33 GBytes  2.00 Gbits/sec  104            sender
[ 93]   0.00-10.01  sec  2.33 GBytes  2.00 Gbits/sec                  receiver
[ 95]   0.00-10.01  sec   714 MBytes   598 Mbits/sec  188            sender
[ 95]   0.00-10.01  sec   713 MBytes   598 Mbits/sec                  receiver
[ 97]   0.00-10.01  sec  2.35 GBytes  2.02 Gbits/sec  175            sender
[ 97]   0.00-10.01  sec  2.35 GBytes  2.02 Gbits/sec                  receiver
[ 99]   0.00-10.01  sec  1.09 GBytes   935 Mbits/sec  193            sender
[ 99]   0.00-10.01  sec  1.09 GBytes   934 Mbits/sec                  receiver
[101]   0.00-10.01  sec  1.01 GBytes   866 Mbits/sec  202            sender
[101]   0.00-10.01  sec  1.01 GBytes   865 Mbits/sec                  receiver
[103]   0.00-10.01  sec  1.04 GBytes   891 Mbits/sec  208            sender
[103]   0.00-10.01  sec  1.04 GBytes   890 Mbits/sec                  receiver
[105]   0.00-10.01  sec  2.35 GBytes  2.02 Gbits/sec  194            sender
[105]   0.00-10.01  sec  2.35 GBytes  2.02 Gbits/sec                  receiver
[107]   0.00-10.01  sec  2.33 GBytes  2.00 Gbits/sec  184            sender
[107]   0.00-10.01  sec  2.33 GBytes  2.00 Gbits/sec                  receiver
[109]   0.00-10.01  sec  1.06 GBytes   914 Mbits/sec  160            sender
[109]   0.00-10.01  sec  1.06 GBytes   913 Mbits/sec                  receiver
[111]   0.00-10.01  sec   956 MBytes   801 Mbits/sec  198            sender
[111]   0.00-10.01  sec   955 MBytes   801 Mbits/sec                  receiver
[113]   0.00-10.01  sec  2.29 GBytes  1.97 Gbits/sec   94            sender
[113]   0.00-10.01  sec  2.29 GBytes  1.97 Gbits/sec                  receiver
[115]   0.00-10.01  sec   774 MBytes   649 Mbits/sec  249            sender
[115]   0.00-10.01  sec   773 MBytes   648 Mbits/sec                  receiver
[117]   0.00-10.01  sec  1.01 GBytes   868 Mbits/sec  226            sender
[117]   0.00-10.01  sec  1.01 GBytes   867 Mbits/sec                  receiver
[119]   0.00-10.01  sec   669 MBytes   561 Mbits/sec  212            sender
[119]   0.00-10.01  sec   668 MBytes   560 Mbits/sec                  receiver
[121]   0.00-10.01  sec  1.12 GBytes   958 Mbits/sec  262            sender
[121]   0.00-10.01  sec  1.11 GBytes   956 Mbits/sec                  receiver
[123]   0.00-10.01  sec  2.31 GBytes  1.98 Gbits/sec  142            sender
[123]   0.00-10.01  sec  2.31 GBytes  1.98 Gbits/sec                  receiver
[125]   0.00-10.01  sec   779 MBytes   653 Mbits/sec  242            sender
[125]   0.00-10.01  sec   778 MBytes   652 Mbits/sec                  receiver
[127]   0.00-10.01  sec   632 MBytes   530 Mbits/sec  277            sender
[127]   0.00-10.01  sec   631 MBytes   529 Mbits/sec                  receiver
[129]   0.00-10.01  sec  2.34 GBytes  2.01 Gbits/sec  114            sender
[129]   0.00-10.01  sec  2.34 GBytes  2.01 Gbits/sec                  receiver
[131]   0.00-10.01  sec  2.30 GBytes  1.98 Gbits/sec  114            sender
[131]   0.00-10.01  sec  2.30 GBytes  1.98 Gbits/sec                  receiver
[SUM]   0.00-10.01  sec  84.2 GBytes  72.3 Gbits/sec  12904             sender
[SUM]   0.00-10.01  sec  84.2 GBytes  72.2 Gbits/sec                  receiver
CPU Utilization: local/sender 193.8% (3.5%u/190.3%s), remote/receiver 1033.3% (26.5%u/1006.9%s)
snd_tcp_congestion cubic
rcv_tcp_congestion cubic