> sendfile() isn't zero-copy, it's just two-less-copies.

zero-copy means "zero copy-operations within memory"

non-zero-copy usually goes
device -> buffer -> user space -> buffer -> device (2 copy operations)
zero-copy
device -> buffer/userspace/shared -> device

--
Roy Sigurd Karlsbakk, MCSE, MCNE, CLS, LCA

Computers are like air conditioners.
They stop working when you open Windows.


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