Как справиться с ошибкой [pool www] seems busy?

Помогите настроить PHP-FPM.

My config / Конфигурация сервера:

Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz
Core: 9
Ram: 10GB
Swap: 2GB

When reaching 200 online on a laravel project, PHP-FPM throws a 502 error. Here's what PHP-FPM writes in logs. / При достижении 200 онлайна на проекте, PHP-fpm отрубает.(примерно 10-15 секунд)

WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 32 children, there are 16 idle, and 186 total children

My last config pool.d / Последний конфиг

pm = ondemand
pm.max_children = 400
pm.process_idle_timeout = 5s;
pm.max_requests = 0

1 PHP-fpm process takes 50mb on average. In the old PHP-fpm config was such an error.

WARNING: [pool www] server reached max_children setting (100), consider raising it