Hi All,

I just upgrade Nginx from 1.8 o 1.9 on my FreeBSD box.
After I enabled reuseport on my server, it seems now there is one worker always takes up 100% CPU and all the rest workers are use less than 1% CPU. In the day time it's OK because my website doesn't have lots of users. But at night it's very slow.

Active connections: 5716
server accepts handled requests
175477 175477 1805645
Reading: 1 Writing: 698 Waiting: 5541

After I disable reuseport, it seems my website speed is back to normal. Each worker (18 workers in total) takes up about 10%-15% CPU.

I understand that enable reuseport will disable accept_mutex. But My understanding is that Nginx will assign work load to different multiple socket listeners then to different workers. BUt it seems in my environment all workload was assign to the same worker, even though it's very busy and the rest are idle.

Did I miss anything in the configuration? or for a busy server, it's better to use accept_mutex instead of reuseport?