How can I tune linux kernel parameter?

How can I tune the kernel parameter
of linux such as SHMMAX(max share
memory)... and so on.
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Kernel tunable parameters can be adjusted through /proc/sys filesystem.
for instance to specify max shared memory you can do:
echo your_value > /proc/sys/kernel/shmmax
The documents in /usr/src/linux/Documentation/sysctl/ list the parameters you can tune with /proc/sys

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w3guyAuthor Commented:
Although I can adjust SHMMAX now,
I can not adjust SHMMIN,SHMMNI,SHMSEG,
SEMMSL ... yet.
Thank you very much, edicom!
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