5.3. 如何调整您的系统以获得最佳 Caudium 性能

 o Increase your system max descriptors numbers :
 
 # echo 60000 > /proc/sys/fs/file-max
 # echo 180000 > /proc/sys/fs/inode-max
 # ulimit -n 60000
 o mount your filesystems with the "noatime" option
 o make sure your disks holding the logs are "fast enough"

 o You can tweak a bit your TCP/IP stack :
 # echo 0 > /proc/sys/net/ipv4/tcp_syncookies
 # echo 0 > /proc/sys/net/ipv4/tcp_ecn
 # echo 0 > /proc/sys/net/ipv4/tcp_timestamps
 # echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
	

# tunefs -p /dev/da0s1a
tunefs: soft updates:  (-n)                                disabled
tunefs: maximum contiguous block count: (-a)               15
tunefs: rotational delay between contiguous blocks: (-d)   0 ms
tunefs: maximum blocks per file in a cylinder group: (-e)  2048
tunefs: average file size: (-f)                            16384
tunefs: average number of files in a directory: (-s)       64
tunefs: minimum percentage of free space: (-m)             8%
tunefs: optimization preference: (-o)                      time
	

# tunefs -n enable /dev/"whatever"
	

# tunefs -n enable "filesystem"
	

kern.ipc.maxsockets="5000"
kern.ipc.nmbclusters="65536"
	

hw.ata.wc="1"
	

vfs.vmiodirenable=1
kern.ipc.maxsockbuf=2097152
kern.ipc.somaxconn=8192
kern.ipc.maxsockets=16424
kern.maxfiles=65536
kern.maxfilesperproc=32768
net.inet.tcp.rfc1323=1
net.inet.tcp.delayed_ack=0
net.inet.tcp.sendspace=65535
net.inet.tcp.recvspace=65535
net.inet.udp.recvspace=65535
net.inet.udp.maxdgram=57344
net.local.stream.recvspace=65535
net.local.stream.sendspace=65535
	

options         P1003_1B                #Posix P1003_1B real-time extensions
options         _KPOSIX_PRIORITY_SCHEDULING
        

* A comment is started by a star '*'
* 
* 1 maxusers per mega of ram. This machine has 512M then maxusers = 512
set maxusers=512
set hires_tick=1
set rlim_fd_max=10000
set rlim_fd_cur=4096
*set tcp:tcp_conn_hash_size=8192
* Don't setup this if you don't have more than 256M of RAM
set bufhwm=48000

* Folling are used to delay page reaping with databases.
set fastscan = 32000
set slowscan = 200
set maxpgio =  280
set lotsfree = 1024
set desfree = 512
set minfree = 128
set autoup = 280

*  Hash buffer sizes during Specweb testing
set tcp:tcp_conn_hash_size = 2097152

* Nic Interface
set hme:hme_adv_100fdx_cap=1
set hme:hme_adv_100hdx_cap=0
set hme:hme_adv_10fdx_cap=0
set hme:hme_adv_10hdx_cap=0
set hme:hme_adv_autoneg_cap=0

* To prevent buffer overflow
set noexec_user_stack=1
set noexec_user_stack_log=1