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It's built into the socket library, so most high performance web apps already manually enable TCP_NODELAY. This just allows you to force it OS-wide.

Linux used to have something similar, called TCP low-latency mode, but the flag is no longer functional. Now, there are various distribution specific options or you can rebuild your kernel with multiple related build options to achieve the same.

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With "socket library" you mean libc?

yes, there is [typically] nothing else.

you can ofcourse do a syscall directly, but i am not sure what value add _that_ is, `man -S 2 syscall` for more information.

edit: 'typically' because some languages / runtimes might go the syscall route.

Thats why i ask. "the socket library" is an very odd way to refer to the libc.

Some other Unix operating systems had the functions in a own socket library, e.g. SunOS: https://docs.oracle.com/cd/E19120-01/open.solaris/817-4415/s... .

I suppose though in the context of Linux it's a bit weird, but you did get the correct meaning :).

Not in context.

Well, Go for example does syscalls directly.

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