优化方向：
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Linux
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net.core.somaxconn 排队最大连接数
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net.core.netdev_max_backlog 网卡相关
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file descriptors
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sys.fs.file-max 系统级的最大文件打开数
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nofile（/etc/security/limits.conf） 进程级的最大文件打开数
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Nginx 参数
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Worker Processes
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worker_processes
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worker_connections
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Keepalive
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Keepalive Connections
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keepalive_requests
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keepalive_timeout
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Upstream keepalives
- keepalive
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Access Logging
- access_log buffer/flush
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Sendfile
- sendfile (zero‑copy)
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Limits
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limit_conn/limit_conn_zone
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limit_rate
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limit_req/limit_req_zone
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max_conns
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queue\Caching\Compression (NGINX Plus)
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# 启用 keepalive 也需要包含下面的配置指令
proxy_http_version 1.1;
proxy_set_header Connection "";