Deploy nodejs server on reverse proxy nginx is slow

[SudoDios]

I create a nodejs http server and using autocannon to loadtest. When I use this node server without a nginx proxy, the requests reach 137k per second. But when I use it with nginx reverse proxy, it reaches 60k per second. Why ???? please help me.🙏

[jarebear6expepjozn6rakjq5iczi3irqwphcvb]

Can you post config for the reverse proxy?

[SudoDios]

user www-data;
worker_processes auto;
worker_rlimit_nofile 900000;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
    worker_connections 400000;
    use epoll;
        multi_accept on;
}

http {

    ##
    # Basic Settings
    ##

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 10;
    #types_hash_max_size 2048;
    # server_tokens off;

    # server_names_hash_bucket_size 64;
    # server_name_in_redirect off;

    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    ##
    # SSL Settings
    ##

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE
    ssl_prefer_server_ciphers on;

    ##
    # Logging Settings
    ##

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    ##
    # Gzip Settings
    ##

    gzip on;
        gzip_min_length 10240;
        gzip_comp_level 1;
        gzip_vary on;
        gzip_disable msie6;
        gzip_proxied expired no-cache no-store private auth;

    ##
    # Virtual Host Configs
    ##

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;

    access_log off;

    auth_basic "Auth ...";
        auth_basic_user_file /etc/nginx/.htpasswd;

        server {
       listen myIP:80;

       client_max_body_size 1g;

       location / {
          root /home/sudodios/banoo;
       }
       location /api/ {
        proxy_pass http://localhost:2000/;
       }
    }
}

http://localhost:2000/ is my node server.

[aminvakil]

@SudoDios You may have reached the kernel security limits and nginx -t may give you a hint about it, or you may have reached max tcp connections, can nodejs listen on unix sockets?