Dynamic vs static memory allocation of buffers for network I/O and C?

The processor won't look up memory differently depending on where it is. Allocating on the stack is much faster, much less error-prone. Only use dynamic allocation if the allocation needs to be dynamic that is, you need a variable lifetime or type of an object.

Else, use static allocation.

I would not be so concerned with cache effects here. Socket I/O is slow and cache inefficient anyway because it requires system calls and data copying from the kernel buffer to the user space, there is no POSIX way to do zero-copy socket I/O (you can do that with custom hardware though). The best you can do is minimize the number of syscalls required to send and receive data through the socket.

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