How to know the right value for SHMMAX and SHMALL for ia64 memory 32Gb

Dear all,
I want to install Oracle database 10g R2 on RHEL 5 ia64.
Here the server specification :
Proc : itanium64 ( montecito )
Mem : 32Gb
# getconf PAGE_SIZE = 16384
Metalink says, that SHMMAX should be half of physical memory and SHMALL = SHMMAX / PAGE_SIZE.
kernel.shmmax = 17179869184
kernel.shmall = 1048576
My Question is this is right value for SHMMAX and SHMALL on my server..??
Thank you

if shmmax is half the ram then what should be sga
sga size should anyhow should be less then shmmax ,means we cannot increase sga size more than half the ram
then how ROT for SGA that should be 70% of RAM hold good

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