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bad performance with static files + keepalive

October 26, 2013 08:09AM
Hi List,

i have a strange performance-issue on a server that serves
static-files only (http + https), if files are bigger than 5k:

- rps drops from 6500 rps (empty file) to 13 rps when requesting a file > 5k
- perftest with location /perftest/ is at 8000 rps (https) / 15000 rps (http)
- perftest with empty.html is 6500 rps (https) / 13000 rps (http)
- perftest with 5k script.js is 1500 rps (https) / 12000 rps (http)
- perftest with 30k script.js is 13 rps (https) / 300 rps (http)
- beside that bad performance we have a lot of complaints of
slow servers and i can confirm that loading of these resouces takes up to 15 seconds

- OS is SLES11.2, system is a kvm virtual-machine, 2 cores, 1GB ram, 270mb free, 420mb cached
- fresh reboot
- no iowait
- no shortage of ram
- error_log/debug shows nothing.

what i played with so far, with no improvements:

- open_file_cache
- keepalive_requests 10.....100000
- keepalive_timeout
- sendfile/tcp_*
- various ssl_ciphers (PFS is not needed here)
- different nginx-version (os is 1.0.10, self-compiled is 1.4.2)

i'm scratching my head an am wondering: what did i missed?
there must be something ... on similar setup with debian/ssl
we receive an average of 4000 rps for static files with
PFS-algos on.

worker_processes 2;

worker_rlimit_nofile 10000;

#error_log /var/log/nginx/error.log;
#error_log /var/log/nginx/error.log notice;
#error_log /var/log/nginx/error.log info;

#pid /var/run/nginx.pid;

events {
worker_connections 1000;
use epoll;
multi_accept on;

http {
include mime.types;
default_type application/octet-stream;

#log_format main '$remote_addr - $remote_user [$time_local] "$request" '
# '$status $body_bytes_sent "$http_referer" '
# '"$http_user_agent" "$http_x_forwarded_for"';

# access_log off;
sendfile on;
tcp_nopush on;
tcp_nodelay on;

send_timeout 15s;

#keepalive_timeout 0s;
keepalive_timeout 15s;
keepalive_requests 10;

server_tokens off;

open_file_cache max=1000 inactive=20s;
open_file_cache_valid 60s;
open_file_cache_min_uses 2;
open_file_cache_errors on;


server {

ssl_session_cache shared:SSL:10m;
ssl_session_timeout 1440m;
ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;
# ssl_ciphers ECDHE-RSA-AES256-SHA384:AES256-SHA256:RC4:HIGH:!MD5:!aNULL:!EDH:!AESGCM;
# ssl_ciphers RC4:HIGH:!aNULL:!MD5;

ssl_prefer_server_ciphers on;

ssl_ciphers HIGH:!aNULL:!MD5:!kEDH:!kECDH;

location / {
root /srv/htdocs/domain;
expires 1w;


location /perftest {
return 200;

regards & thanx in advance
Subject Author Posted

bad performance with static files + keepalive

mex October 26, 2013 08:09AM

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