Take the 2-minute tour ×  I am running an nginx server that acts
as a proxy to an upstream unix socket, like this:  upstream
app_server {         server unix:/tmp/app.sock fail_timeout=0;
server {         listen ###.###.###.###;         server_name
whatever.server;         root /web/root;          try_files $uri
@app;         location @app {                 proxy_set_header
X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header Host $http_host;                 proxy_redirect
off;                 proxy_pass http://app_server;  Some app
server processes, in turn, pull requests off /tmp/app.sock as
they become available. The particular app server in use here is
Unicorn, but I don't think that's relevant to this question.
The issue is, it just seems that past a certain amount of load,
nginx can't get requests through the socket at a fast enough
rate. It doesn't matter how many app server processes I set up.
I'm getting a flood of