That’s ignoring the other costs of syscalls like evicting your stuff from the CPU caches.

But I agree with the conclusion, system calls are still pretty fast compared to a lot of other things.

Small correction on ambiguous wording - syscalls do not evict all your stuff from CPU caches. It just has to page in whatever is needed for kernel code/data accessed by the call, but that’s no different from if it was done in process as a normal function call.

	▲	Polizeiposaune an hour ago \| parent [-]
		Depending on implementation details of your CPU and OS, the syscall path may need to flush various auxillary caches (like one or more TLBs) to prevent speculation attacks, which may put additional "drag" on your program after syscall return.