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esxi-65u2-kernel-settings.md

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ESXi 6.5 Update 2 Build 8294253 Kernel Settings

Total: 245

Name Description Default Runtime Configured
acpiDbgLevel ACPI debug level 0 0 0
acpiSpcrPort Select which serial port is associated with the port described in the ACPI SPCR table. The selected port uses the SPCR configuration (except the baud rate, which is always controlled via the com*_baud option) com1 com1 com1
allowNonNX Allow booting with NX feature disabled or non present. FALSE FALSE FALSE
asyncSerialLogging Make serial logging asynchronous TRUE TRUE TRUE
auditMode Audit mode boot. FALSE FALSE FALSE
autoCreateDumpFile If enabled and if no suitable dump partition or dump file exists, create a dump file. TRUE TRUE TRUE
autoPartition Enable/Disable auto-partitioning of empty local disks. FALSE FALSE FALSE
autoPartitionCreateUSBCoreDumpPartition Enable/Disable auto-partitioning of core dump partition for USB boot devices. Requires that autoPartition is set to TRUE as well. FALSE FALSE FALSE
autoPartitionDiskDumpPartitionSize Disk dump partition size in MB that gets configured during the auto-partition process. 2560 2560 2560
autoPartitionOnlyOnceAndSkipSsd When using auto-partitioning, only create one set of VMFS/Diagnostic/Scratch partitions, and skip partitioning SSDs FALSE FALSE FALSE
autoSetupLocalPMem Auto setup PMem.0 - Do not do any auto setup1 (default) - Auto create PMem namespace, format a namespace if it is empty. Don't touch Block namespaces2 (force) - Use with care. Remove all data and remove Block namespaces. Auto create PMem namespace and setup PMem 1 1 1
bc2Enable Enable new buffer cache. FALSE FALSE FALSE
bcCatchBufOverRun Catch uncached, non-zero-copy buffer overruns. FALSE FALSE FALSE
bcNumPools Number of buffer cache pools. Set to zero for auto-scale. 0 0 0
bootDeviceRescanTimeout Boot device rescan timeout (in minutes). 1 1 1
BOOTIF MAC address of the NIC used for booting.
BOOTUUID Boot partition UUID. 7a5a55249a9b99e043e44adcb441afe7
buddyPhysicalMemoryDebugStruct Buddy physical mem debug info switch. FALSE FALSE FALSE
busSpeedMayVary Allow different APIC timer speeds on different CPUs. FALSE FALSE FALSE
cacheFlushImmOnAllHalt Flush caches immediately if all cores sharing LLC halt (AMD only) FALSE FALSE FALSE
checkCPUIDLimit Refuse to run on CPUID limited cpus. TRUE TRUE TRUE
checkPages Check that free and free-lpage-pool pages are not corrupted. FALSE FALSE FALSE
com1_baud Baud rate for COM1. 115200 115200 115200
com1_bitwidth COM1 register width in bits 8 8 8
com1_hz COM1 input frequency in Hz (0 -> automatic) 0 0 0
com1_irq COM1 IRQ (default 4) 4 4 4
com1_mem COM1 memory address (0 -> uses I/O address) 0 0 0
com1_port COM1 I/O address (0 -> disabled, default 0x3f8) 0x3f8 0x3f8 0x3f8
com1_sbdf PCI device to use for COM1 (overrides com1_port and com1_irq)
com2_baud Baud rate for COM2. 115200 115200 115200
com2_bitwidth COM2 register width in bits 8 8 8
com2_hz COM2 input frequency in Hz (0 -> automatic) 0 0 0
com2_irq COM2 IRQ (default 3) 3 3 3
com2_mem COM2 memory address (0 -> uses I/O address) 0 0 0
com2_port COM2 I/O address (0 -> disabled, default 0x2f8) 0x2f8 0x2f8 0x2f8
com2_sbdf PCI device to use for COM2 (overrides com2_port and com2_irq)
coresPerPkg Number of cores per package that vmkernel should use 0 0 0
correctBSPMTRRMasks Correct BSP Variable MTRR masks to match the processor physical address bit support TRUE TRUE TRUE
createNoMemFakeNUMAnode Create one extra NUMA node that does not have memory. FALSE FALSE FALSE
createNoPCPUFakeNUMAnode Create one extra NUMA node that does not have PCPUs. FALSE FALSE FALSE
cryptoUseASM Use ASM for crypto: Default enabled. TRUE TRUE TRUE
debugBreak Break into debugger during vmkernel initialization. FALSE FALSE FALSE
debugHeapList Semicolon separated list of : that should run as debug heaps
debugLogToSerial 0=Serial debug logging off, 1=Serial debug logging on, 2=Defer to config option DebugLogToSerial. 2 2 2
delayCFOH Time delay for Cache Flush On Halt (0: 5.12us, 1-127: n*10.24us) 128 128 128
devListStabilityCount Dev/Path list stability max iterations 3 3 3
devRandom Enable real /dev/random instead of forwarding to /dev/urandom. FALSE FALSE FALSE
disableACSCheck Bypass ACS capability checks on all PCIE devices FALSE FALSE FALSE
disableC1E Disable C1E FALSE FALSE FALSE
disableCFOH Disable Cache Flush on Halt FALSE FALSE FALSE
disableHwrng Disable hardware random number generator (RDRAND, RDSEED) FALSE FALSE FALSE
disableTopoEx Ignore AMD CPU topology extensions FALSE FALSE FALSE
disableTurbo Disable Turbo Mode FALSE FALSE FALSE
disableVMFS3Module Disable VMFS3 Module. FALSE FALSE FALSE
diskDumpSlotSize Disk dump slot size in MB. 0 = automatically sized, otherwise requsted size >= 100 MB. 0 0 0
diskPartitionType Allow toggling scratch partition type0 - vfat (Scratch) only1 - ufs (Scratch) only2 - vfat (Scratch) + ufs3 - ufs (Scratch) + vfat 0 0 0
dmaEngineExposeIdentityMapping Whether to expose whether DMA engines do identity mapping. TRUE TRUE TRUE
dmaMapperPolicy DMA mapping policy to use. disabled disabled disabled
driverVMAllowDevicesWithDrivers Allow the DriverVM to claim devices for which vmkernel already has drivers FALSE FALSE FALSE
driverVMAutoclaim Autoclaim unclaimed network devices and assign them to DriverVM (useful for installer and PXE booting) FALSE FALSE FALSE
driverVMEnabled Enable DriverVM functionality if required files are present FALSE FALSE FALSE
dumpDiag Dump diagnostics information. FALSE FALSE FALSE
earlyPoisonVerify Check that all pages are poisoned before the first regular allocation is made FALSE FALSE FALSE
elcr Override ELCR value (-1 = use actual ELCR value) -1 -1 -1
enableACSCheckForRP Enable ACS capability checks for Root Port FALSE FALSE FALSE
enableAdaptableLockSupport Enable adaptable lock support. TRUE TRUE TRUE
enableAllPCIESegments Enable PCIE segment numbers > 0 (segment 0 is always enabled) TRUE TRUE TRUE
enablePCIEHotplug Enable PCI-E Native Hotplug support TRUE TRUE TRUE
enablePCIErrors Enable PCI-E Error Reporting FALSE FALSE FALSE
enableValidPCIDevices Enable all PCI devices with valid resources, but are disabled by BIOS TRUE TRUE TRUE
enableVMXSandboxFeature Enable/Disable VMX Sandbox feature. TRUE TRUE TRUE
execInstalledOnly Execute only those files that have been installed via a vib package and have not been modified. FALSE FALSE FALSE
executePOST Run POST tests. FALSE FALSE FALSE
fakeNUMAnodes Fake # NUMA nodes on UMA systems. 0 0 0
fakePMemPct Amount of fake persistent memory (in pct of all volatile memory) 0 0 0
fakeReliableMemMPN Mark all MPNs up to the specified value as reliable. MPNs already marked as reliable will not be affected by this option. 0 0 0
firewireEnabled Enable FireWire support; Firewire will be enabled implicitly by the *Port settings below FALSE FALSE FALSE
forceCRS Always use IRQ from _CRS FALSE FALSE FALSE
fsCheck Run filesystem checks on system partitions. FALSE FALSE FALSE
FSSNumAIORequests Number of requests that can be queued to the file system aio helper queue. 0 0 0
FSSNumBaseFileHandles Maximum number of base file handles 4096 4096 4096
gdbPort gdb port; com1 or com2 default default default
generalCriticalMemory Pages to reserve as general critical memory 0 0 0
heapCheckTimerInterval Interval in seconds between heap timer checks 10 10 10
heapFreeOwnerCheck Check heap ownership on free operations FALSE FALSE FALSE
heapFreePoisonByte Byte pattern used to poison freed memory 0xFF 0xFF 0xFF
heapMetadataProtect Use poisoned red zones to protect against under/overruns FALSE FALSE FALSE
heapMetaPoisonByte Byte pattern used to poison red zones for allocations 0x5A 0x5A 0x5A
heapMgrTotalVASpaceGB VA space in GB allocated by heap manager for all heaps 512 512 512
heapPoisonFreeMem Poison free memory to catch use after free bugs FALSE FALSE FALSE
heapPoisonTimerChecks Check heap poisoned areas for corruption on regular intervals FALSE FALSE FALSE
hijackSCIForNMI Wire SCI to generate an NMI. FALSE FALSE FALSE
hyperthreading Enable hyperthreading if available. TRUE TRUE TRUE
ignoreHeadless Ignore Headless attribute from ACPI FADT. FALSE FALSE FALSE
ignoreMsrFaults Ignore general protection faults as a result of rdmsr and wrmsr instructions FALSE FALSE FALSE
intelTXTErrorCode Intel TXT boot failed on previous attempt 0 0 0
interleaveFakeNUMAnodes Fake nodes will be created as interleaved nodes. FALSE FALSE FALSE
interruptsDisabledPanicTimeUS Panic timeout for how long an IRQs can be disabled via VMKAPI 0 0 0
intrBalancingEnabled Indicates if interrupt balancing is enabled TRUE TRUE TRUE
intrVectRetireTimeMS Delay to retire an interrupt vector after migration, in ms 4000 4000 4000
ioAbilityChecks Enforce checking of whether regions can be DMA mapped. FALSE FALSE FALSE
iommuMapReservedMem Controls mapping of reserved memory for identity-mapped IOMMU domains; 0 = Honor ACPI RMRR; 1 = Map all reserved memory; 2 = Don't map any reserved memory 1 1 1
iovDisableIR Disable Interrrupt Remapping in the IOMMU. Not applicable for platforms pre-configured by firmware to use x2APIC (e.g., platforms with > 256 logical processors); for these interrupt remapping is always enabled. FALSE FALSE FALSE
ipmiEnabled Enable IPMI TRUE TRUE TRUE
isPerFileSchedModelActive Enable per file scheduling model on this host TRUE TRUE TRUE
leaveWakeGPEsDisabled Disallow a wake GPE from also being a runtime GPE TRUE TRUE TRUE
loadESX Enable/Disable loadESX support FALSE FALSE FALSE
logicalApicId Use logical not physical APIC IDs. FALSE FALSE FALSE
logOnScreen Display vmkernel log on screen. FALSE FALSE FALSE
logPort Serial port to enable for logging; com1 or com2 default default default
logSerialToTTY force logging over a specified TTY instead of logPort. 0 0 0
maxCartelsPerContainer Number of cartels per userworld container 50 50 50
maxIntrCookies Maximum number of interrupts vmkernel should support. 1024 1024 1024
maxLogEntries Size of the kernel log buffer in 256-byte lines. 0=Use default. Min is 1024. Max is 32768. 0 0 0
maxNumExtraSplitsPerNode Maximum number of extra splits added to each memory node 0 0 0
maxPCPUS Number of PCPUs vmkernel should use. 576 576 576
maxPCPUsNUMAInterleaving Enable NUMA-node interleaving of enabled PCPUs. TRUE TRUE TRUE
maxVCPUsPerCore Max number of VCPUs should run on a single core. 0 == determine at runtime 0 0 0
maxVMs Max number of VMs VMKernel should support. 0 == determine at runtime 0 0 0
memCheckEveryWord Check every single word when checking mem. FALSE FALSE FALSE
memDistPolicyNumber Memory distribution policy to use. 0 0 0
memLowReservedMB Amount of low memory (< 4 GB) which gets reserved. 0 == determine at runtime 0 0 0
memmapMaxEarlyPoisonMemMB Memory that should be poisoned during early initialization. 65536 65536 65536
memmapMaxPhysicalMemMB Maximum physical memory (in MB) addressable by kernel. 16777216 16777216 16777216
memmapMaxRAMMB Maximum conventional memory (RAM) supported on the system. Additional RAM above this limit will not be used by the system. 12582912 12582912 12582912
memmapStressHighBitMPNs Test > 64GB physical RAM support by ignoring 4GB - 64GB range FALSE FALSE FALSE
memNodeLookupTableBranchFactor How much is a cache line worth compared to a branch when determining if we should use a lookup table for the MPN->MemNode translation 1 1 1
microcodeUpdate Update microcode from boot module if available TRUE TRUE TRUE
microcodeUpdateForce Disable check that microcode update is newer than installed microcode and that both are released versions FALSE FALSE FALSE
minMemoryCheck Enable check for minimum required system memory at boot TRUE TRUE TRUE
netBlockableLock Control locks in networking areas other than Tcpip be blockable FALSE FALSE FALSE
netCoalesceTimerHdlrPcpu Pcpu that coalesce timeout handler runs on. 0 0 0
netDVSSyncEnabled Enable/Disable DVSSync support. TRUE TRUE TRUE
netGPHeapMaxMBPerGB Maximum MB of the general purpose networking heap to be allocated per GB of physical memory. 4 4 4
netHeapsAdditionalMB Additional heap memory for most networking heaps in MB 0 0 0
netMaxPCPUPktCacheSize Maximum number of pkt buffers queued in each PCPU slab cache. 128 128 128
netMaxPktsToProcess Maximum number of packets to process in each invocation packet processing routine 64 64 64
netMinPortsSystemWide Minimum threshold for the number of active ports systemwide. 1536 1536 1536
netMiscPreemptionEnabled Enable preemption regions in other networking contexts FALSE FALSE FALSE
netNetqueueEnabled Enable/Disable NetQueue support. TRUE TRUE TRUE
netNumPortsets Maximum number of portsets. 256 256 256
netPagePoolLimitCap Maximum number of pages period for the packet page pool. 98304 98304 98304
netPagePoolLimitPerGB Maximum number of pages for the packet page pool per gigabyte. 5120 5120 5120
netPagePoolResvCap Maximum number of pages to reserve for the packet page pool. 0 0 0
netPagePoolResvPerGB Number of pages to reserve for the packet page pool per gigabyte. 0 0 0
netPanicBadDevOpen Panic if device has a bad open handler. TRUE TRUE TRUE
netPktHeapMaxMBPerGB Maximum MB of low-memory packet heap to be allocated per GB of physical memory. Maximum value for this setting is 512. 6 6 6
netPktHeapMinMBPerGB Minimum MB of low-memory packet heap to be allocated per GB of physical memory. Maximum value for this setting is 200. 0 0 0
netPktPoolMaxMBPerGB Maximum MB of networking packet buffer pool to be allocated per GB of physical memory. Maximum value for this setting is 512. Net packet pool maximum per system will be at least 656MB. 75 75 75
netPktPoolMinMBPerGB Minimum MB of networking packet buffer pool to be allocated per GB of physical memory (multiple of 24) 0 0 0
netPollContext The context to run netpoll (0 for worldlet and 1 for system world). 1 1 1
netPollPreemptionEnabled Enable preemption regions in netPoll contexts FALSE FALSE FALSE
netPreemptionEnabled Enable/disable preemption support in overall networking area FALSE FALSE FALSE
netTcpipAdaptableLock Control locks within Tcpip module be adaptable FALSE FALSE FALSE
netTcpipBlockableLock Control locks within Tcpip module be blockable FALSE FALSE FALSE
netTcpipContext The context to run Tcpip (0 for worldlet and 1 for system world). 1 1 1
netTcpipMcsLock Control locks within Tcpip module be MCS FALSE FALSE FALSE
netTcpipPreemptionEnabled Enable/disable preemption support in tcpip module FALSE FALSE FALSE
netTcpipUpcallPreemptionEnabled Enable/disable preemption while executing client callbacks from tcpip module FALSE FALSE FALSE
netVMTxContext The context to run VM Tx (0 for worldlet and 1 for system world). 1 1 1
netVMTxPreemptionEnabled Enable preemption regions in VM Tx contexts FALSE FALSE FALSE
nmiAction Action on hardware generated NMI: 0=default (panic, unless changed by advanced config option), 1=enter debugger, 2=panic, 3=log and ignore (not recommended) 0 0 0
noIOMMU Disable IOMMU support forcibly FALSE FALSE FALSE
nonScratchPartitionSize Addtitional disk slot size in MB. 2048 2048 2048
NUMACodeRepStress NUMA code replication stress mode FALSE FALSE FALSE
numActiveSysSchedGroups Number of non-userworld non-VM scheduler groups which have worlds attached. 200 200 200
numaLatencyRemoteThresholdPct Maximum measured memory access latency difference (in percent units) between 2 pairs of NUMA nodes for the pairs to be considered equidistant 10 10 10
numCacheColors Enforce a certain number of cache colors 0 0 0
numNonVMXUWCartels Maximum combined number of non-VMX userworld cartels in all user spaces. 200 200 200
numOfPshareOverflowCounters Number of pshare overflow counters 0 0 0
numSysSchedGroups Number of non-userworld non-VM scheduler groups. 1000 1000 1000
overrideDuplicateImageDetection Override duplicate ESXi image detection FALSE FALSE FALSE
pciBarAllocPolicy PCI BAR allocation policy; 0=first-fit, 1=smallest-fit 0 0 0
pciExperimentalFlags Experimental PCI code options 0 0 0
pcipDisablePciErrReporting Disable error reporting for PCI passthru devices. TRUE TRUE TRUE
pcipSaveOPROM Save PCI OPROM images on boot: 0=Disabled, 1=Enabled, 2=Enabled (VGA Only) 0 0 0
pciSetBusMaster Set bus master bit on PCI devices which were enabled by vmkernel TRUE TRUE TRUE
poisonMarker Value used to poison memmap pages 0xaaaaaaaaaaaaaaaa 0xaaaaaaaaaaaaaaaa 0xaaaaaaaaaaaaaaaa
poisonPagePool Poison memmap pages FALSE FALSE FALSE
poisonPmem Create new pmem volumes as poisioned volumes and load already poisioned volumes as such. If set to FALSE the poisioned property will be removed from a volume. Posioning is never available on release builds. TRUE TRUE TRUE
preemptibleVmkapiHelpers Enable preemption of VMKAPI helpers. FALSE FALSE FALSE
preemptibleVmkapiTimers Enable preemption of VMKAPI timer callbacks. FALSE FALSE FALSE
preemptibleVmkapiWorlds Enable preemption for VMKAPI worlds. FALSE FALSE FALSE
preferVmklinux Boost priority of vmklinux drivers to trump native drivers. FALSE FALSE FALSE
preReserveMemForAsan Amount of memory in KB to prereseve to be used by Asan. 0 0 0
preventFreePageMapping Prevent mapping of free pages FALSE FALSE FALSE
processInterruptsInWorlds Process interrupts in high priority worlds FALSE FALSE FALSE
processorSpeedMayVary Allow different CPU speeds on different CPUs. FALSE FALSE FALSE
rdmaRoceIPBasedGidGeneration Use the new IP-based GID generation for RoCE. TRUE TRUE TRUE
realNMI Use real NMI for LINT1. TRUE TRUE TRUE
reliableMemPsodOnAllocFailure PSOD the system on an allocation with an incorrect reliability 0 0 0
repostLevelTrigIntr Repost skipped level triggered interrupts; not applicable when running ESX in a VM TRUE TRUE TRUE
rollback Indicate if the boot happened after a firmware rollback. FALSE FALSE FALSE
rtcEnableEFI Enable UEFI Runtime Services as real time clock TRUE TRUE TRUE
rtcEnableLegacy Enable legacy CMOS device as real time clock TRUE TRUE TRUE
rtcEnableTAD Enable ACPI 5.0 Time and Alarm Device as real time clock TRUE TRUE TRUE
scanHonoringMemMap Honor the BIOS memory map when scanning memory for firmware tables. FALSE FALSE FALSE
scrubIgnoredPages Check pages that were ignored due to vmbIgnoreStartMPN and vmbIgnoreNumMPNs boot options. FALSE FALSE FALSE
scrubMemoryAfterModuleLoad Check all memory after each module load. This causes booting to be very slow. FALSE FALSE FALSE
serialPolledIRQ Simulated periodic IRQ for serial devices with broken interrupt delivery FALSE FALSE FALSE
serialUntrusted Disable serial port if UART misbehaves. TRUE TRUE TRUE
sharePerNode Share each page once per NUMA node. TRUE TRUE TRUE
skipMicrocodeCompatCheck Disable check for supported processor microcode revision at boot FALSE FALSE FALSE
skipPartitioningSsds If enabled, skip auto-partitioning of empty local SSDs. FALSE FALSE FALSE
smallFontForTTY Use 50-line font for tty. FALSE FALSE FALSE
statelessBOOTIF MAC address of the NIC that was used for booting stateless.
storageHeapMaxSize Maximum size in bytes of the main storage heap 0 0 0
storageHeapMinSize Minimum size in bytes of the main storage heap 0 0 0
storageMaxDevices Maximum number of supported SCSI devices 512 512 512
storageMaxPaths Maximum number of supported SCSI paths 2048 2048 2048
storageMaxVMsPerDevice Maximum number of VMs expected to use a given device 32 32 32
sunRPCUseWorlds The context to run sunrpc (TRUE for system worlds, FALSE for worldlets) TRUE TRUE TRUE
SVGAScaling Pixel scaling factor for SVGA console (default 1) 1 1 1
terminateVMOnPDL Terminate virtual machine on permanent loss of storage FALSE FALSE FALSE
testEarlyPanic Trigger a (fake) early kernel abort. FALSE FALSE FALSE
timerEnableACPI Enable ACPI PM timer as system reference timer. TRUE TRUE TRUE
timerEnableHPET Enable HPET as system reference timer. TRUE TRUE TRUE
timerEnableTSC Enable TSC as system reference timer. TRUE TRUE TRUE
timerForceTSC Always use TSC as system reference timer. FALSE FALSE FALSE
timerInitialCountHigh Initial high 32-bits Timer_GetCycles(). 0 0 0
tracePages Record a stack trace of the freer in freed pages. 0 = off, 1 = on, 2 = auto-select 0 0 0
tscSpeedMayVary Allow different TSC speeds on different CPUs. FALSE FALSE FALSE
tscSyncStress Fraction of boots to force TSC resync (per thousand). 0 0 0
tty1Port TTY1 port; com1, com2 ... to enable default default default
tty2Port TTY2 port; com1, com2 ... to enable default default default
updateBusIRQ Allow adding/removing busIRQ information FALSE FALSE FALSE
useLMCE Use Local MCE feature if supported by hardware and firmware FALSE FALSE FALSE
useNHCC Use non-halted core cycles instead of TSC for accounting in CPU scheduler TRUE TRUE TRUE
useNUMAInfo Enable/disable NUMA-ness TRUE TRUE TRUE
useReliableMem System is aware of reliable memory. TRUE TRUE TRUE
userInitInteractive TRUE if first UW needs an interactive console (init doesn't) FALSE FALSE FALSE
userInitPath First UW path override /bin/init /bin/init /bin/init
useSLIT Use NUMA latency information from the SLIT table if available TRUE TRUE TRUE
uwSimScale Support the given number of hostd-simulators 0 0 0
vga Enable/Disable S/VGA support. TRUE TRUE TRUE
vga64 Use 64K VGA aperture. FALSE FALSE FALSE
vmkacEnable 0=Disabled, 1=Enforcing, 2=Do not enforce, just warn 1 1 1
vmkacMaxDomains Maximum number of security domains 65 65 65
vmkacMaxObjects Maximum number of security object types 60 60 60
vmkATKeyboard Enable VMkernel AT keyboard driver. FALSE FALSE FALSE
vmkLoadEntry Static kernel entry point (offset) 0 0 0
vmkLoadSeed Random seed for kernel entry point 0 0 0
vtdMaxDomains Upper limit for number of VT-d domains supported. 512 512 512
vtdMaxUnits Upper limit for number of VT-d units supported. 128 128 128
vtdSuperPages Enable support for VT-d Super Pages (aka 2MB, 1GB large pages); super-page usage is dependent on this option as well as hardware support. TRUE TRUE TRUE