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Saturday, 16 November 2013

Advanced Memory Attributes

Advanced Memory Attributes
Attribute
Description
Default
Mem.SamplePeriod
Specifies the periodic time interval, measured in seconds of the virtual machine’s execution time, over which memory activity is monitored to estimate working set sizes.
60
Mem.BalancePeriod
Specifies the periodic time interval, in seconds, for automatic memory reallocations. Significant changes in the amount of free memory also trigger reallocations.
15
Mem.IdleTax
Specifies the idle memory tax rate, as a percentage. This tax effectively charges virtual machines more for idle memory than for memory they are actively using. A tax rate of 0 percent defines an allocation policy that ignores working sets and allocates memory strictly based on shares. A high tax rate results in an allocation policy that allows idle memory to be reallocated away from virtual machines that are unproductively hoarding it.
75
Mem.ShareScanGHz
Specifies the maximum amount of memory pages to scan (per second) for page sharing opportunities for each GHz of available host CPU resource. For example, defaults to 4 MB/sec per 1 GHz.
4
Mem.ShareScanTime
Specifies the time, in minutes, within which an entire virtual machine is scanned for page sharing opportunities. Defaults to 60 minutes.
60
Mem.CtlMaxPercent
Limits the maximum amount of memory reclaimed from any virtual machine using the memory balloon driver (vmmemctl), based on a percentage of its configured memory size. Specify 0 to disable reclamation for all virtual machines.
65
Mem.AllocGuestLargePage
Enables backing of guest large pages with host large pages. Reduces TLB misses and improves performance in server workloads that use guest large pages. 0=disable.
1
Mem.AllocUsePSharePool
and
Mem.AllocUseGuestPool
Reduces memory fragmentation by improving the probability of backing guest large pages with host large pages. If host memory is fragmented, the availability of host large pages is reduced. 0 = disable.
15
Mem.MemZipEnable
Enables memory compression for the host. 0 = disable.
1
Mem.MemZipMaxPct
Specifies the maximum size of the compression cache in terms of the maximum percentage of each virtual machine's memory that can be stored as compressed memory.
10
LPage.LPageDefragEnable
Enables large page defragmentation. 0 = disable.
1
LPage.LPageDefragRateVM
Maximum number of large page defragmentation attempts per second per virtual machine. Accepted values range from 1 to 1024.
32
LPage.LPageDefragRateTotal
Maximum number of large page defragmentation attempts per second. Accepted values range from 1 to 10240.
256
LPage.LPageAlwaysTryForNPT
Try to allocate large pages for nested page tables (called 'RVI' by AMD or 'EPT' by Intel). If you enable this option, all guest memory is backed with large pages in machines that use nested page tables (for example, AMD Barcelona). If NPT is not available, only some portion of guest memory is backed with large pages. 0= disable.
1