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Nginx slow connect

March 08, 2012 06:52AM
Im trying to diagnose a connection issue with nginx on debian. there is an delay of anything from 2-10 seconds on the connection, im using curl to test:

curl -o /dev/null -w "Connect: %{time_connect} TTFB: %{time_starttransfer} Total time: %{time_total} \n" -s
Connect: 0.657 TTFB: 1.183 Total time: 7.150

Here is a pastebin of the tcpdump output for the curl request above: http://pastebin.com/2tdZHqFr

Server load averages 0.5 and never goes above 0.10

I have also tested using webpagetest.org from different locations and the same connection issue exists.

the files are served from an ssd mounted on another machine.

Linux main 2.6.32-5-amd64 #1 SMP Wed May 18 23:13:22 UTC 2011 x86_64 GNU/Linux

nginx conf:

user www-data;
worker_processes 4;
worker_rlimit_nofile 802768;
error_log /var/log/nginx/error.log;
pid /var/run/nginx.pid;

events {
use epoll;
worker_connections 60000;
multi_accept on;

http {
include /etc/nginx/mime.types;

# access_log /var/log/nginx/access.log;
access_log off;
sendfile off;
keepalive_timeout 75;
tcp_nodelay on;
keepalive_requests 2000;
connection_pool_size 8192;
client_body_buffer_size 1024K;
client_header_buffer_size 8k;
client_max_body_size 10M;
fastcgi_buffers 4 256k;
fastcgi_buffer_size 128k;
fastcgi_busy_buffers_size 256k;
large_client_header_buffers 8 8k;
ignore_invalid_headers on;

client_header_timeout 60;
client_body_timeout 60;
send_timeout 60;

output_buffers 8 32k;
postpone_output 0;
server_name_in_redirect off;
server_tokens off;

tcp_nopush on;

gzip on;
gzip_min_length 1100;
gzip_buffers 32 8k;
gzip_comp_level 2;
gzip_types text/plain text/html application/x-javascript text/xml text/css text/javascript;
gzip_vary on;

include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;

sysctl here -> http://pastebin.com/iYEfv9xc

open_file_cache max=5000 inactive=20s;
open_file_cache_valid 30s;
open_file_cache_min_uses 2;
open_file_cache_errors on;

server {
listen 80 ; ## listen for ipv4

server_name example.com;
root /mnt/ssd/www/static;

location ~* \.(css|js)$ {

expires max;
add_header Pragma public;
add_header Cache-Control "public, must-revalidate, proxy-revalidate";


ifconfig eth0:
eth0 Link encap:Ethernet HWaddr 00:15:17:26:b4:bd
inet addr:x.x.x.x Bcast:x.x.x.x Mask:
inet6 addr: fe80::215:17ff:fe26:b4bd/64 Scope:Link
RX packets:1136534270 errors:0 dropped:0 overruns:0 frame:0
TX packets:623191419 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:174357516836 (162.3 GiB) TX bytes:323522620298 (301.3 GiB)

cat /proc/cpuinfo:

model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz

cat /proc/meminfo:

MemTotal: 4058884 kB
MemFree: 3366684 kB
Buffers: 117632 kB
Cached: 288320 kB
Subject Author Posted

Nginx slow connect

redgoals March 08, 2012 06:52AM

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