tiens voila la liste des parametre kernel tunables 
Parameter Description
--------- -----------
dump_cnt Size of the dump
autoup Used in struct var for dynamic configuration of the
age that a delayed-write buffer must be,in seconds,
before bdflush will write it out (default = 60)
bufhwm Used in struct var for v_bufhwm; it's the high water
mark for buffer cache memory usage, in Kbytes
(default = 2% of physical memory).
maxusers Maximum number of users
The default is number of Megabytes in physical memory minus 2.
max_nprocs Maximum number of processes (default = 10 + 16 * maxusers).
maxuprc The maximum number of user processes.
(default = max_nprocs - 5)
rstchown POSIX_CHOWN_RESTRICTED is enabled (default = 1).
ngroups_max Maximum number of supplementary groups per user
(default = 32).
rlim_fd_cur Maximum number of open file descriptors per process
sysem wide (default = 64, max = 1024) also seelimit(1).
Streams Parameters:
nautopush Number of entries in the autopush free list,
the high water mark for Streams administrative
devices (sads). One autopush entry is needed for each
entry in the /etc/iu.ap file and any others that may
be configured by using the autopush command directly,
or by openingthe sad device and using the SAD_SAP
ioctl(). If you run out of autopush entries, the ioctl()
will return -1 and set errno to ENOSR (out of streams
resources).
sadcnt Number allowed of concurrent opens of both
/dev/sad/user and /dev/sad/admin (default 16).
Once all are in use, open() will return -1 and
set errno to ENXIO (No such device or address).
Psuedo Devices: (Needs reboot -r to take effect)
npty Number of 4.X pseudo-ttys configured (default = 48).
The device entries are /dev/pty*
pt_cnt Number of 5.X pseudo-ttys configured (default = 48).
(keep below 3000)
The device entries are /dev/pts/*
Paging Parameters:
physmem Sets the number of pages usable in physical memory.
Only use this for testing, it reduces the size of usable
memory.
minfree Memory threshold which determines when to start swapping
processes, when free memory falls to this level swapping
begins (default:
2.5.1 and later : desfree / 2
2.5 : desfree / 2 at most 100k bytes (sun4d 200k bytes)
2.4 : 4d = 50 pages, all others 25 pages
2.3 : physmem / 64 ).
desfree This is the desired free level, this determines when
paging is abandoned for swapping. When free memory stays
below this level for 30 seconds, swapping kicks in (default:
2.5.1 and later : lotsfree / 2
2.5 : physmem / 64 at most 200k bytes (sun4d 400k bytes)
2.4 : 4d = 100 pages, all others 50 pages,
2.3 : physmem / 32 ).
lotsfree Memory threshold which determines when to start paging.
When free memory falls below this level paging begins
(default:
2.5.1 and later : physmem / 64 or at least 512k bytes worth
of pages
2.5 : physmem / 32 at most 512k bytes (sun4d 1024k bytes)
2.4 : 4d = 256 pages all others 128 pages
2.3 : physmem / 16 ).
fastscan The number of pages scanned per second when free memory
is zero, the scan rate increases as free memory falls
from lotsfree to zero, reaching fastscan (default:
2.5 and later : physmem / 2 with 64Mb of memory being max
2.4 : physmem / 4 with 64Mb of memory being max
2.3 : physmem / 2 ).
slowscan The number of pages scanned per second when free memory
is equal to lotsfree, also see fastscan (default:
2.5 and later : fastscan / 10 but not to exceed 100
2.4 : is fixed at 100,
2.3 : fastscan / 10 ).
handspreadpages The distance between the fronthand and backhand in
the clock algorithm. The larger the number the longer an
idle page can stay in memory (default:
2.5 and later : fastscan
2.4 : physmem / 4
2.3 : physmem / 2 ).
maxpgio The maximum number of page-out I/O operations per second.
This acts as a throttle for the page deamon to prevent
page thrashing ((DISKRPM * 2) /3 ).
t_gpgslo 2.1 through 2.3, Used to set the threshold on when to
swap out processes (default 25 pages ).
File System Parameters:
ufs_ninode Maximum number of inodes.
(default = max_nprocs + 16 + maxusers + 64)
ndquot Number of disk quota structures.
(default = (maxusers * NMOUNT / 4) + max_nprocs)
ncsize Number of dnlc entries.
(default = max_procs + 16 + maxusers + 64);
dnlc is the directory-name lookup cache
TCP/IP Parameters:
arptab_size Size of arp table
ipcnt Size of ip_pcb
ipprovcnt Size of provider
loopcnt Size of loop_pcb
ntcp Number of tcp devices, tcp_dev
nudp Number of udp devices, udp_dev
