[root@freenas] ~# sysctl -a | grep mps
device  mps
dev.mps.0.spinup_wait_time: 3
dev.mps.0.chain_alloc_fail: 0
dev.mps.0.enable_ssu: 1
dev.mps.0.max_chains: 2048
dev.mps.0.chain_free_lowwater: 2047
dev.mps.0.chain_free: 2048
dev.mps.0.io_cmds_highwater: 6
dev.mps.0.io_cmds_active: 0
dev.mps.0.driver_version: 20.00.00.00-fbsd
dev.mps.0.firmware_version: 20.00.07.00
dev.mps.0.disable_msi: 0
dev.mps.0.disable_msix: 0
dev.mps.0.debug_level: 3
dev.mps.0.%parent: pci6
dev.mps.0.%pnpinfo: vendor=0x1000 device=0x0072 subvendor=0x1028 subdevice=0x1f1c class=0x010700
dev.mps.0.%location: pci0:6:0:0
dev.mps.0.%driver: mps
dev.mps.0.%desc: Avago Technologies (LSI) SAS2008
dev.mps.%parent:
kstat.zfs.misc.zcompstats.skipped_insufficient_gain: 2
kstat.zfs.misc.zcompstats.empty: 1
kstat.zfs.misc.zcompstats.attempts: 732