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Add TCULink and make it the default for --switch user
For some time, UserSwitch has suffered from abysmal performance due to rx and tx offload settings. In the latest Ubuntu 16.04/Linux 4.4 kernel, it simply doesn't work with the default settings, since packets with bad TCP checksums are generated at one end, passed through the user switch, and dropped at the other. It doesn't seem to be something we can fix in UserSwitch itself although it may be possible to do something in the C code of the Stanford reference switch and CPqD switch.
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