Bandwith used limited by Apache/Kernel ?

2025-04-17

(Sorry if the URLs aren't clickables... I still don't have 5 posts here yet :p)

Here is the bandwith usage of a server :
http ://213.186.44.174/mrtg.png

As you can see, the bandwith usage is very stable and linear from 10 hr (~6.5Mbps out, ~4Mbps in). This stability isn't normal, and Firefox returns 1 time on 10 Connection timed out or Connection refused by server.

First I though it was a problem with the connection, but the peak around 14 o'clock proves contrary, it is a wget test from another server.

Server's configuration :

Debian Woody
uname -a: Linux ns4 2.4.31 #2 SMP Mon Jul 18 17:25:56 CEST 2005 i686 GNU/Linux
loadavg : 1.59, 1.61, 1.62
mii-tool eth0: eth0: negotiated 100baseTx-FD, link ok

Apache 1.3.34

netstat -ant | wc -l: 27839
ps aux | grep -c httpd: 203

httpd.conf

Code:

Timeout 300
KeepAlive Off
MaxKeepAliveRequests 100
KeepAliveTimeout 15
StartServers 256
MinSpareServers 30
MaxSpareServers 100
MaxClients 512
MaxRequestsPerChild 10000

MySQL 4.1.15
- Connection made using unix socket
- ~1700 sql queries/day
Hardware config :
- Dell PE1850
- 2 * Xeon EMT64 2.8 Ghz, FSB800, 1MB L2
- 2 * 1 GB DDR2
- 2 * 74 GB 10krpm SCSI Hard Drive, RAID0
- 1 * Integrated RAID with 128 MB write cache
- 1 * NIC Intel Gigabit, plugged on a 15 Mbps Internet connection

As the loadavg can tell, there is less than 1 process per CPU... so it is very low Bandwith used limited by Apache/Kernel ?

I don't explain the bandwith limit... maybe a kernel limit ? Any ideas ?