Eu fiz um pequeno benchmarking.
= Resumo =
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Use o adaptador em ponte, se possível, é muito mais rápido que o NAT.
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Para taxa de transferência em várias conexões (vencedor):
--natsettings1 1500,64,64,64,1024
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Para rendimento em conexão única:
--nictype1 Am79C973
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Já ouvi coisas boas sobre o virtio em outros ambientes.
= Medidas detalhadas =
# host os: windows7
# guest os: ubuntu14
# natsettings: $mtu,$socksnd,$sockrcv,$tcpsnd,$tcprcv
# list of space separated results in Mbit/s from:
# iperf -c other-box -P $x
# --natsettings 16000,1024,1024,1024,1024
# https://twitter.com/alphazo/status/142200878068277248
# x:=1 : 70 100 120 97 99
# x:=4 : 574 517 519 497 548
# x:=8 : 552 585 509 613 597
# --natsettings 16000,128,128,0,0
# http://en.helpdoc-online.com/virtualbox_4.1.2/source/ch09s11.html
# x:=1 : 57 48 52 46 54
# x:=4 : 150 146 134 154 182 183
# x:=8 : 204 171 277 195 186
# --natsettings 1500,1024,1024,1024,1024
# http://serverfault.com/questions/447775/virtualbox-slow-upload-speed-using-nat/450734#450734
# x:=1 : 67 69 74 86 63
# x:=4 : 514 520 614
# x:=8 : 549 579 572
# --natsettings 1500,64,64,64,1024
# https://www.virtualbox.org/ticket/10034?cversion=0&cnum_hist=8
# http://www.kiwix.org/wiki/Black%26White_Project/Compilation_Farm/Setup
# x:=1 : 99 74 71 85 96 119 103 83 107 80
# x:=4 : 647 696 688 677 701 540 582 498 510 533
# x:=8 : 610 666 622 607 677 586 510 528
# --natsettings 1500,64,64,64,2048 (my experiment 7)
# x:=1 : 81 62 57
# x:=4 : 179 146 151
# --natsettings 1500,64,64,64,512 (my experiment 8)
# x:=1 : 55 63 75
# x:=4 : 377 380 477
# x:=8 : 412 544 485
# x:=16: 174 379 376
# --natsettings 1500,64,64,64,1024 (repeat)
# x:=4 : 673 680 745
# --natsettings 16000,64,64,64,2048 (my experiment 9)
# x:=1 : 48 47 59
# x:=4 : 123 149
# --natsettings 1500,64,64,64,1280 (my experiment 10)
# x:=1 : 43 47 46
# x:=4 : 145 149 159
# --natsettings 1500,64,64,64,768 (my experiment 11)
# x:=1 : 58 79 95
# x:=4 : 566 470 510
# --natsettings 1500,64,64,64,640 (my experiment 12)
# x:=1 : 75 88 56
# x:=4 : 550 491 547
# x:=8 : 549 532
# --natsettings 1500,128,128,128,1024 (my experiment 13)
# x:=1 : 70 109 57
# x:=4 : 503 480 549 596
# --natsettings 1500,32,32,32,1024 (my experiment 14)
# x:=1 : 73 81 108
# x:=4 : 582 598 511
# x:=8 : 550 675 563
# --natsettings 16000,256,256,0,0
# http://stackoverflow.com/questions/26389285/vagrant-waiting-for-chef-zero-to-start
# x:=1 : 64 41 60 41
# x:=4 : 143 184 147
# x:=8 : 122 204 210
# --natsettings 1500,4096,4096,1024,1024 (my experiment 1)
# x:=1 : 130 93 87 109 104
# x:=4 : 524 565 559 566
# x:=8 : 556 607 552 543 536 588
# --natsettings 16000,4096,4096,1024,1024 (my experiment 2)
# x:=1 : 84 69 78 66 86
# x:=4 : 517 525 575 540 560
# x:=8 : 566 576 575
# --natsettings 16000,8182,8182,8182,8182 (my experiment 3)
# x:=1 : 53 60 53 48 47
# x:=4 : 170 161 177
# x:=8 : 175 203 253 177
# --natsettings 16000,8182,8182,128,128 (my experiment 4)
# x:=1 : 34 44 45 45
# x:=4 : 221 236 196
# x:=8 : 224 277 266
# --natsettings 16000,128,128,8182,8182 (my experiment 5)
# x:=1 : 48 38 50
# x:=4 : 165 203 190
# x:=8 : 207 186 204
# default natsettings
# x:=1 : 41 49 46 58 48
# x:=4 : 171 152 176 149 161
# x:=8 : 215 203 258 208 194
# bridged adapter (82540EM)
# x:=1 : 826 681 860 732 824 688 788 660 665 660 731 924 787 # fantastic speeds! :D
# x:=4 : 666 691 689 680 684
# x:=8 : 588 587 581 572 592
# --nictype1 virtio (default natsettings)
# x:=1 : 13 15 14
# x:=4 : 70 82 50
# x:=8 : 244 96 103
# x:=16: 103 111 196 111 96
# --nictype1 Am79C970A (default natsettings)
# x:=4 : 210 233 237
# --nictype1 Am79C973 (default natsettings)
# x:=4 : 215 244 224
# --nictype1 82540EM (default natsettings)
# x:=4 : 165 153 200 184
# --nictype1 82543GC (default natsettings)
# x:=4 : 133 147 173
# --nictype1 82545EM (default natsettings)
# x:=4 : 153 130 151
# --nictype1 Am79C973 --natsettings 1500,64,64,64,1024 (my experiment 6)
# x:=1 : 172 118 145 117 107 # really good!
# x:=4 : 372 368 364 372 370 # why so bad?
# x:=8 : 358 360 363