# Fedora 19 performs poorly

**URL:** <https://www.ruby-forum.com/t/fedora-19-performs-poorly/246232>\
**Category:** NGINX\
**Created:** [September 19, 2013, 1:47am UTC](https://www.ruby-forum.com/t/fedora-19-performs-poorly/246232 "2013-09-19T01:47:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Rafa\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/958977/32.png) [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\
**Post date:** [September 19, 2013, 1:47am UTC](https://www.ruby-forum.com/t/fedora-19-performs-poorly/246232/1 "2013-09-19T01:47:38Z")

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Note: same message also posted in -ru list

I’m trying to migrate from Fedora 14 (2.6.35.14-97.fc14.x86\_64) to  
Fedora 19 (3.10.11-200.fc19.x86\_64)

worker\_processes 40;  
events {  
worker\_connections 8000;  
use epoll;  
}  
http {  
proxy\_headers\_hash\_max\_size 8096; # default was: 512  
proxy\_headers\_hash\_bucket\_size 128; # default was: 64  
variables\_hash\_max\_size 1024;  
variables\_hash\_bucket\_size 128;  
default\_type application/octet-stream;  
sendfile on;  
keepalive\_timeout 65;  
charset utf-8;  
resolver 127.0.0.1; # necessary for dynamic upstream  
resolution  
limit\_req\_log\_level warn;  
proxy\_intercept\_errors on;  
server {  
listen 80;  
location = /service\_check\_nginx { echo “nginx”; }  
}  
}

Symptoms:

- ab -n1000000 -c1000 ‘[http://localhost/service\_check\_nginx](http://localhost/service_check_nginx)’ (parallel  
4x, i.e. 4000 simultaneous connections)  
says that some requests take \>3sec and/or fails to complete

- netstat -s:  
…  
1269313 times the listen queue of a socket overflowed  
1282868 SYNs to LISTEN sockets dropped  
…

grows with speed of 2000/sec, sometimes more

- CPU load is not spread out evenly between workers:

meanwhile, on F14:

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND  
30042 nobody 20 0 1224m 955m 17m R 41.2 0.4 523:24.45 nginx:  
worker process  
30038 nobody 20 0 1224m 955m 17m S 39.4 0.4 522:24.30 nginx:  
worker process  
30047 nobody 20 0 1224m 955m 17m R 39.4 0.4 520:35.36 nginx:  
worker process  
30053 nobody 20 0 1224m 955m 17m R 39.4 0.4 520:42.77 nginx:  
worker process  
30027 nobody 20 0 1224m 955m 17m S 37.6 0.4 520:55.20 nginx:  
worker process  
30036 nobody 20 0 1224m 955m 18m R 37.6 0.4 525:26.07 nginx:  
worker process  
30037 nobody 20 0 1224m 955m 17m S 37.6 0.4 523:59.09 nginx:  
worker process  
30041 nobody 20 0 1224m 955m 17m R 37.6 0.4 529:31.88 nginx:  
worker process  
30049 nobody 20 0 1224m 954m 17m R 37.6 0.4 519:58.73 nginx:  
worker process

By the way, if I set worker\_connections 800 (worker\_processes 40) and  
start up “ab -c1000 …” – then ab fails with an error (on F19 only;  
fine on F14).

What should I do next?

---

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**Author:** ![Konstantin\_Svist](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/49beb7/32.png) [@Konstantin\_Svist](https://www.ruby-forum.com/u/Konstantin_Svist)\
**Post date:** [September 19, 2013, 1:09pm UTC](https://www.ruby-forum.com/t/fedora-19-performs-poorly/246232/2 "2013-09-19T13:09:02Z")

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Hello!

On Wed, Sep 18, 2013 at 04:47:01PM -0700, Konstantin Svist wrote:

> Note: same message also posted in -ru list

Please see detailed response in nginx-ru@ list. It’s actually not  
a good idea to cross-post.

Short version for others here: from the information provided it  
looks more like a testing problem than a real problem.

[…]

–  
Maxim D.

> **[nginx: donation](http://nginx.org/en/donation.html)**