sysctl.conf配置文件详解(国外英文资料).doc

sysctl.conf配置文件详解(国外英文资料) Sysctl is a tool used to view and adjust system parameters during system operation. Some sysctl parameters is used to return the current state of the system, such as the return has boot time, use the version of the operating system, the core name and so on; and some that we can modify the parameters to adjust the operation of the system, such as network temporary memory size and maximum number of on-line and so on. These parameters that can be adjusted must be set up before a boot system executes other programs, and some can be adjusted at boot time. First, we can use the following instructions to see all of the current sysctl parameters and their status: Sysctl -a more | # Kern.ostype: FreeBSD Kern.osrelease: 5.2.1-RELEASE Kern.osrevision: 199506 Kern.version:, FreeBSD, 5.2.1-RELEASE, #0:, Sun, Apr, 11, 16:16:08, CST, 2004 Alex@:/usr/src/sys/i386/compile/ALEX Kern.maxvnodes: 17812 Kern.maxproc: 2020 Kern.maxfiles: 4040 Kern.argmax: 65536 Kern.securelevel: -1 Kern.hostname: Kern.hostid: 0 Kern.clockrate: {Hz = 100, tick = 10000, profhz = 1024, stathz = 128} Kern.posix1version: 200112 Kern.ngroups: 16 Kern.job_control: 1 Kern.saved_ids: 0 Kern.boottime: {sec = 1081672724, USEC = 885137} Sun Apr 11 16:38:44 2004 Kern.domainname: Kern.osreldate: 502010 Kern.bootfile: /boot/kernel/kernel Kern.maxfilesperproc: 3636 Kern.maxprocperuid: 1818 Kern.ipc.maxsockbuf: 262144 Kern.ipc.sockbuf_waste_factor: 8 Kern.ipc.somaxconn: 128 Kern.ipc.max_linkhdr: 16 Kern.ipc.max_protohdr: 60 Kern.ipc.max_hdr: 76 Kern.ipc.max_datalen: 132 Kern.ipc.nmbclusters: 9024 ......... Slightly......... We can also use sysctl to display single parameter values, for example: # sysctl kern.ipc.maxsockbuf Kern.ipc.maxsockbuf: 262144 Not all parameters can be adjusted with sysctl, and some parameters do not have much impact on performance. We are here only to illustrate some of the more obvious settings. 9.2.1 kern.ipc.maxsockets This is used to set the maximum number of socket