# Slow response times

**URL:** <https://www.ruby-forum.com/t/slow-response-times/242523>\
**Category:** NGINX\
**Created:** [June 30, 2015, 8:42am UTC](https://www.ruby-forum.com/t/slow-response-times/242523 "2015-06-30T08:42:11Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [June 30, 2015, 8:42am UTC](https://www.ruby-forum.com/t/slow-response-times/242523/1 "2015-06-30T08:42:11Z")

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We are currently using nginx/1.7.10 @Ubuntu12.04 for serving high load  
webapp with about 12-15k QPS mostly tiny requests / HTTP/1.1 keep-alive  
mode. Nginx is used as proxy for http backends. From time to time we  
are noticing traffic gaps and during this time nginx answers very slowly  
(up to 20-25s) across all virtual hosts. There are no any error  
messages in general error log and also server has much of resources  
available. The nature of service is that http backends have very low  
read/connect proxy timeout value (40ms) and nginx should be able to send  
static file during error interception, those timeout happen very often  
(2-3k during a second) But unfortunately we cant make it stable enough  
to provide fast static answer during backend slowness periods since it  
hangs and answers very slow

Location configuration:

```
         access_log off;

         error_page 500 501 502 503 504 408 404 =200 /file.dat;

         include proxy_params;
         proxy_intercept_errors on;
         proxy_cache off;
         proxy_redirect off;
         proxy_pass_request_body on;
         proxy_pass_request_headers on;
         proxy_next_upstream off;
         proxy_read_timeout 40ms;
         proxy_connect_timeout 40ms;
         proxy_send_timeout 40ms;

         set $args src=g2;
         proxy_pass http://upstream/;
         proxy_http_version 1.1;
         proxy_set_header Connection "";
     }

```

Stub\_status during normal operation:  
Active connections: 831  
server accepts handled requests  
919758 919758 945641607  
Reading: 0 Writing: 44 Waiting: 787

I can share any needed debug/stats info for sure.

Thank you for your cooperation