Kernel parameter in solaris 10

Hi,

I'm using solaris 10 and oracle db 10g. Need to verify some kernel setting .

1. Is shmsys:shminfo_shmmax is a total cumulative for all instance or just for one instance?

2. Document also said that"

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Q1:  Why can't we just set them the old way?
A1:  Actually, you can.  While it is not the preferred method, kernel parameter values specified in /etc/system are still honored, with some caveats:

* Values in /etc/system must be greater than the new default values of Solaris 10 / Solaris 11
* Any kernel parameters tunables that are obsolete in Solaris 10 / Solaris 11 are ignored.
* Values specified in /etc/system are global and affect all processes on the system.