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The ZBM_LGMAP_PERCENT tunable can be used to control the percentage of the kpgseg (segkvn) kernel virtual segment reserved for most large mappings, but DRV_SEGKMEM_BYTES is the preferred tunable when setting aside kernel virtual memory for large driver mappings.
# crash dumpfile = /dev/mem, namelist = /stand/unix, outfile = stdout Engine: 0 Procslot: 56 Lwpslot: 0 > od segkmem_size c096c830: 02600000 > q #
In this example, the size for segkmem is 0x2600000 bytes in hexdecimal.