http://people.allbsd.org/~hrs/FreeBSD/zmemcheck.sh

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Kernel Memory Utilization:
        TEXT=8834104 (8.42 MB)
        DATA=98472960 (93.91 MB)
        TOTAL=107307064 (102.34 MB)
Memory Handling Tunables:
        vm.kmem_size=671088640 (640.00 MB)
        vm.kmem_size_max=671088640 (640.00 MB)
        vfs.zfs.arc_max=104857600 (100.00 MB)
        vfs.zfs.vdev.cache.size=10485760 (10.00 MB)
        vfs.zfs.vdev.cache.max=16384 (0.02 MB)
Other Tunables:
        vfs.zfs.zil_disable=0
        vfs.zfs.prefetch_disable=1
        vfs.zfs.cache_flush_disable=0
        vfs.zfs.mdcomp_disable=0

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Kernel Memory Utilization:
        TEXT=8966400 (8.55 MB)
        DATA=160784384 (153.34 MB)
        TOTAL=169750784 (161.89 MB)
Memory Handling Tunables:
        vm.kmem_size=671088640 (640.00 MB)
        vm.kmem_size_max=671088640 (640.00 MB)
        vfs.zfs.arc_max=268435456 (256.00 MB)
        vfs.zfs.vdev.cache.size=10485760 (10.00 MB)
        vfs.zfs.vdev.cache.max=16384 (0.02 MB)
Other Tunables:
        vfs.zfs.zil_disable=0
        vfs.zfs.prefetch_disable=0
        vfs.zfs.cache_flush_disable=0
        vfs.zfs.mdcomp_disable=0

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Kernel Memory Utilization:
        TEXT=8396538 (8.01 MB)
        DATA=1406061568 (1340.92 MB)
        TOTAL=1414458106 (1348.93 MB)
Memory Handling Tunables:
        vm.kmem_size=1073741824 (1024.00 MB)
        vm.kmem_size_max=1073741824 (1024.00 MB)
        vfs.zfs.arc_max=805306368 (768.00 MB)
        vfs.zfs.vdev.cache.size=10485760 (10.00 MB)
        vfs.zfs.vdev.cache.max=16384 (0.02 MB)
Other Tunables:
        vfs.zfs.zil_disable=0
        vfs.zfs.prefetch_disable=0
        vfs.zfs.cache_flush_disable=0
        vfs.zfs.mdcomp_disable=0