Currently the major source of overhead for user space udp is a slow sendmsg path. Unlike tcp which gets TSO support from nics, with udp you currently send 1 sendmsg per mtu segment which has to traverse the udp stack multiple times. This will change in kernel 4.18 with GSO.
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@ErrataRob says that udp should be faster in this post: https://blog.erratasec.com/2018/11/some-notes-about-http3.html … - 7 more replies
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