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Nginx spending high CPU in perf tests (vs HAProxy)

August 01, 2020 10:10AM
Two scenarios:-

* When upstream supports higher aggregate QPS than what Nginx can support on a host, nginx has better CPU performance than HAProxy. (Nginx == 700% CPU, HAProxy = 1200% CPU)

* When upstream capacity is limited, and my benchmarking tool sends QPS higher than what the upstream supports, nginx is showing unbelievably high CPU usage when compared to HAProxy. (Nginx == 400% CPU, HAProxy = 60% CPU)

Hence, there's something about Nginx where it shines as the throughput increases but at low throughput, it has higher CPU usage than HAProxy. Any pointers on what behavior is causing this? My guess is, Nginx is enqueuing a lot more TCP streams than the upstream can handle, which ultimately causes higher CPU than HAProxy.

user root;
worker_processes auto;
daemon off; error_log ./error.log;
pid /run/nginx.pid;
include /usr/share/nginx/modules/*.conf;

events {
worker_connections 1024;
stream { server_traffic_status_zone;
log_format basic '$proxy_protocol_addr - $remote_user [$time_local] '
access_log ./access.log basic;

upstream xproxy {
server {
listen 80;

proxy_pass xproxy;
proxy_protocol on;

Thank you.
Subject Author Posted

Nginx spending high CPU in perf tests (vs HAProxy)

shadyabhi August 01, 2020 10:10AM

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