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to understand what is semaphores read :
Check Oracle Doc about this
In Solaris 10, you do not control semaphores through /etc/system, you have to set them up in your project definition. The same applies to your shared memory. This is really important: your system is working, but it may be running completely on defaults and could fail any time. That having ben said, clearly the semaphores and so on are OK, or it wouldn't be running.
This is irrelevant to performance.