iam getting error like ORA-27125: unable to create shared memory segment

When I am trying to create db instances, I am getting errors like below:

SQL> ORA-27125: unable to create shared memory segment HPUX-ia64 Error: 12: Not enough space

My system physical memory has 15.68 GB and my

shmmax value is = 1640MB sga_max_size = 3540MB sga_target = 3540MB 

and in opt/oracle has more than 10gb. I have tried modifying sga value but still i am only getting error.

Thanks in advance.

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