Comment by senderista
1 day ago
If that were true then presumably Microsoft wouldn't have ported it to Windows:
https://learn.microsoft.com/en-us/windows/win32/api/ioringap...
Although Windows registered network I/O (RIO) came before io_uring and for all I know might have been an inspiration:
https://learn.microsoft.com/en-us/previous-versions/windows/...
That argument holds no water. IOUring is essential for the performance of some modern POSIX programs.
You can see shims for fork() to stop tanking performance so hard too. IOUring doesnt map at all onto IOCP, at least the windows subtitute for fork has “ZwCreateProcess“ to work from. IOUring had nothing.
IOCP is much nicer from a dev point of view because your program can be signalled when a buffer has data on it but also with the information of how much data, everything else seems to fail at doing this properly.
The CQE for e.g. a successful read(2) operation will have the number of bytes read in the `res` field.