I am not picking my numbers randomly. On a x86/x86-64 Linux kernel, one socket (one connection) will use at least one 4kB physical memory page. So if userland also allocates one or two 4kB pages for its own needs, you need at minimum 8 to 12kB per connection. That's why I quoted ~10kB.
The minimum theoretical memory usage is 4kB per connection: 1 page in kernel space, and nothing on the userland (eg. you use zero-copy to txfer data between sockets or to/from file descriptors).
The minimum theoretical memory usage is 4kB per connection: 1 page in kernel space, and nothing on the userland (eg. you use zero-copy to txfer data between sockets or to/from file descriptors).
At Google, our SSL/TLS overhead per connection is 10kB: https://www.imperialviolet.org/2010/06/25/overclocking-ssl.h...