[jeffbee]

"Drown other applications" is unfortunately exactly what happens when you let the Linux kernel run your TCP stack. Profile your application and you may discover that your CPUs are being spent running the protocol stack on behalf of other applications.

[lxgr]

What do you mean by "other applications"?

[jeffbee]

I mean when your application sends on a socket, the kernel may also send and receive traffic for another task while it's in the syscall, just for funsies, and this is true even if your applications are containerized and you believe their CPU cores are dedicated to the container.

[lxgr]

Ah, but that's an OS implementation problem, not one with TCP or QUIC, no?

[jeffbee]

Sure, but the ready appeal of QUIC is that it is in user space by nature, while Linux ties TCP to the kernel. You either need special privileges to run user space TCP on Linux, or you need a different operating system kernel altogether.