Re: [users@httpd] Web Server Performace Issues

[edward.dunkle@xxxxxxxxxxx]

We have been testing with the following
tunings on a similar linux box.  I would be interested to here if
your performance improves with this:

Linux Tuning :

set the following values in /etc/sysctl.conf

kernel.msgmni = 1024
kernel.sem = 1000 32000 32 512
fs.file-max = 2097152
fs.inode-max = 8388608
kernel.shmmax =      
 2147483648
### net.ipv4.tcp_max_syn_backlog = 8192
net.ipv4.tcp_max_syn_backlog = 1024

### some of these are invalid
net.ipv4.tcp_rfc1337=1
### some say use 1800
net.ipv4.tcp_keepalive_time=120
net.ipv4.tcp_keepalive_intvl=15
net.ipv4.tcp_keepalive_probes=4 
net.ipv4.tcp_max_orphans=256

# increase TCP max buffer size
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
# increase Linux autotuning TCP buffer
limits
# min, default, and max number of bytes
to use
net.ipv4.tcp_rmem = 4096 87380 16777216

net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.route.flush=1

#
# Decrease the time default value for
tcp_fin_timeout connection
net.ipv4.tcp_fin_timeout = 30
# Turn off the inefficient tcp options
net.ipv4.tcp_window_scaling = 0
net.ipv4.tcp_sack = 0
net.ipv4.tcp_timestamps = 0

sysctl -p
/etc/rc.d/init.d/network restart

vi /etc/security/limits.conf
web          soft
   nofile  8192
web          hard
   nofile  65536

/etc/rc.d/init.d/sshd restart

Apache:
insert the follwing line into bin/envvars
to fix Apache memory handling on Enterprise Linux:
export LD_ASSUME_KERNEL=2.4.1

Also, I think this might work better:
<IfModule mpm_worker_module>
    ServerLimit          64
    ThreadLimit        2048
    StartServers         12
    MaxClients         2048
    MinSpareThreads       1
    MaxSpareThreads      32
    ThreadsPerChild      32
    MaxRequestsPerChild   0
</IfModule>

If you are confident you are not losing
memory, fine.  Otherwise use something like:
MaxRequestsPerChild 1024