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Port wscale branch against current gPXE master

Recent TCP updates is a lot different from previous base of wscale branch.

Adding some facilities for testing convenience

  • Add a command to modify TCP window size at runtime.
  • print “\b%c” instead of “.” in monojob, keep the console clean.
  • Add a pause command.

wscale2 testing branch tcpfix2 testing branch

Window size difference

Window Size tcpfix2 branch wscale2 branch
KVM TAP/NAT Native KVM TAP/NAT Native
8K 17KB/s 16KB/s 16KB/s
16K 43KB/s 43KB/s 41KB/s
32K 94KB/s 93KB/s 91KB/s
64K 198KB/s 192KB/s
128K 374KB/s
256K 742KB/s
512K
1024K

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