nginx反向代理吞吐量周期性下降，会是什么？

Question

这是使用的nginx配置。所有被评论的东西都被尝试过，没有任何影响。我还使用了worker_connections的值和相关的东西。这种周期性下降是由什么引发的？

    worker_processes  2;

    #worker_rlimit_nofile              2048;
    events {
        #  multi_accept                    on;
        worker_connections              1024;
        use                             epoll;
    }
    http {
        resolver 127.0.0.11 ipv6=off;
        include mime.types;
        #tcp_nodelay                     off;
        #tcp_nopush                      on;
        upstream postgrest {
            server postgrest:3000;
            keepalive 64;
        }
        server {
            listen       80;
            server_name  localhost;
            charset utf-8;

            location /rest/ {
                default_type  application/json;
                #proxy_buffering off;
                proxy_pass http://postgrest/; # Reverse proxy to your PostgREST
            }
        }
    }

Answer 1

#tcp settings
net.core.somaxconn
net.ipv4.tcp_fin_timeout
net.ipv4.tcp_tw_reuse
net.ipv4.ip_local_port_range

#nginx configs
proxy_set_header  Connection "";
proxy_http_version 1.1;