I'd suggest these values for HP/UX 11i (64-bit). We have used the same values on HP/UX 10.2 (32-bit) on 7.x, 8.x, and 9.x without problems.

SEMMAP (SEMMNI + 2)
SEMMNI 4096
SEMMNS (SEMMNI * 2)
SEMMNU (NPROC - 4)
SEMVMX 32768
SHMMAX Available physical memory
SHMMNI 512
SHMSEG 32

Here's a few that have bit us in the past:
NPROC 4000
MAXUPRC ((NPROC*9)/10)
NFILE (15 * NPROC + 2048)
NFLOCKS 4096


You didn't ask for it, but .. Best of luck .. on your migration to Linux. (just poking fun)

-Ken