nginx reuseport with backlog

Question

In nginx if I specify reuseport and backlog=X

stream {
  server {
    listen 8080 backlog=X reuseport;

will I get a maximum queue length of size X per socket/worker or a max total queue of size X?

Answer 1

I went to look at the nginx source code and it seems to me that it is X per socket/worker:

https://github.com/nginx/nginx/blob/751bdd3bb2b6ff54be09c37ff328f258fed520fb/src/core/ngx_connection.c#L119

https://github.com/nginx/nginx/blob/751bdd3bb2b6ff54be09c37ff328f258fed520fb/src/core/ngx_connection.c#L654

but I'm not very familiar with the nginx codebase.