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SHM implementation in 2.2.x

What are the real limits in using SHM ?
I looked through the code and are quite lost.
There seem to be a 24 bit limit in ID + IDX bits (shmparam.h). Is this
due to the fact that the other 8 bits are used for SWP_TYPE ?
What is the limit for SHMMAX and what advantage is there to leave it at
a lower limit ?

What we need are many big shared segments (say 4000 * 1 GB). Is this
possible with the current implementation ? Or what must be changed ?
Only SHM_ID_BITS and SHMMAX ?

Thanks in advance.

- Thomas

--
Thomas Hiller
Compaq Computer EMEA BV
SAP International Competence Center
LinuxLab



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