Question about nginx as http forward proxy

Server NGINX
1

Hi,

I’m trying to use nginx as forward proxy with high loaded server on
CentOS 5.4. My stats showing good results (about memory/cpu usage and
traffic). But Apache benchmark showing some percentage of lagged
sessions. If I’m using Apache as forward proxy I don’t see this lags.

Can you recommend me some config changes or may be I can boost nginx up
other way?

ab -n 1000 -c 5 http://www.google.com/
Apache:
…
Connection Times (ms)
min mean[+/-sd] median max
Connect: 29 43 9.4 40 80
Processing: 120 155 27.7 151 604
Waiting: 61 87 23.2 81 389
Total: 157 197 28.2 192 649
Percentage of the requests served within a certain time (ms)
50% 192
…
99% 277
100% 649 (longest request)

Nginx:
…
Connection Times (ms)
min mean[+/-sd] median max
Connect: 30 47 164.3 35 3035
Processing: 110 164 58.1 157 1005
Waiting: 61 85 37.9 77 604
Total: 150 211 174.4 196 3226

Percentage of the requests served within a certain time (ms)
50% 196
…
99% 487
100% 3226 (longest request)

Part of my forward proxy config:
worker_processes 32;
worker_rlimit_core 10000000000000000;
working_directory /tmp;
events {
use epoll;
worker_connections 10240;
multi_accept on;
}
http {
af_headers on;
include mime.types;
default_type text/plain;

 access_log off;

 sendfile        on;
 tcp_nopush     off;

 keepalive_timeout  1;
 keepalive_requests 30;

 gzip  on;
 gzip_comp_level 6;
 gzip_buffers 16 8k;
 gzip_types text/plain text/css application/json

application/x-javascript text/xml application/xml application/xml+rss
text/javascript;
gzip_disable “MSIE [1-6].(?!.*SV1)”;

 resolver 127.0.0.1;

 server {
     location ~ /extern/login_status\.php  {
       if ( $host ~* facebook.com ) {
         return 403;
       }
             }

     gzip_proxied any;

     gunzip on;
     gunzip_strict off;
     gunzip_options any content_type 200;

     error_log /etc/nginx/logs/error.log alert;
     listen       7070;
     server_name  hss;

     location / {
        proxy_pass  http://$host$request_uri;
        proxy_buffering off;
        proxy_buffers 16 64k;
        proxy_buffer_size 64k;
     }
 }

}