16.5 Common Kernel Tunable Parameters

   

As you have seen in the kernel system file, there are many kernel tunable parameters. Values of these parameters greatly affect system performance. Some of these parameters are explained in Table 16-1.

Table 16-1. Important Kernel Tunable Parameters
Name Function
shmmax Maximum amount of shared memory in bytes
shmseg Maximum number of shared memory segments that can be attached to a process
maxvgs The value of the highest numbered volume group
bufpages Static buffer cache pages
maxfiles Soft limit to the number of files a process can open
maxfiles_lim Hard limit to the number of files a process can open; no more open files allowed
nfile Maximum number of open files on the system at any time
nflocks Maximum number of file or record locks
fs_async Enable/disable synchronous disk write
maxuprc Maximum number of processes per user
nproc Maximum number of processes that can exist simultaneously on a system
timeslice Allocation of time slice among competing processes
maxusers Maximum size of system table
npty Number of pseudoterminals
maxswapchunks Maximum amount of swap space that can exist on the system
nswapdev Maximum number of devices that can be used as device swap
remote_nfs_swap Enable or disable swap to remote NFS access

Before changing any of these parameters, be sure that you know what is its effect on the system performance.


   
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HP Certified
HP Certified: HP-UX System Administration
ISBN: 0130183741
EAN: 2147483647
Year: 2000
Pages: 390
Authors: Rafeeq Rehman

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