ipmctl-show-memory-resources - Man Page

Shows PMem module and DDR memory allocation

Synopsis

ipmctl show [OPTIONS] -memoryresources

Description

Shows PMem module and DDR memory allocation information for this platform.

Options

-h, -help

Displays help for the command.

-ddrt

Used to specify DDRT as the desired transport protocol for the current invocation of ipmctl.

-smbus

Used to specify SMBUS as the desired transport protocol for the current invocation of ipmctl.
Note

The -ddrt and -smbus options are mutually exclusive and may not be used together.

-o (text|nvmxml), -output (text|nvmxml)

Changes the output format. One of: "text" (default) or "nvmxml".

-u (B|MB|MiB|GB|GiB|TB| TiB), -units (B|MB|MiB|GB|GiB|TB| TiB)

Changes the units that capacities are displayed in for this command. One of: bytes (B), megabytes (MB), mebibytes (MiB), gigabytes (GB), gibibytes (GiB), terabytes (TB) or tebibytes (TiB).

Examples

Shows the PMem module and DDR memory allocation.

ipmctl show -memoryresources

Limitations

In order to successfully execute this command:

Return Data

Returns a table containing the attributes listed below.

Note

Capacities from unmanageable PMem modules are not included in the following aggregated totals.

Volatile DDR Capacity

Total DDR capacity that is used as volatile memory.

Volatile PMem module Capacity

Total PMem module capacity that is used as volatile memory.

Total Volatile Capacity

Total DDR and PMem module capacity that is used as volatile memory.

AppDirect PMem module Capacity

Total PMem module capacity used as persistent memory.

Total AppDirect Capacity

Total DDR and PMem module capacity used as persistent memory.

Cache DDR Capacity

Total DDR capacity used as a cache for PMem modules.

Total Cache Capacity

Total DDR capacity used as a cache for PMem modules.

Inaccessible DDR Capacity

Total DDR capacity that is inaccessible.

Inaccessible PMem module Capacity

Total PMem module capacity that is inaccessible due to any of:

  • Platform configuration prevents accessing this capacity. For example, MemoryCapacity is configured but MemoryMode is not enabled by platform FW (current Memory Mode is 1LM).
  • Capacity is inaccessible because it is not mapped into the System Physical Address space (SPA). This is usually due to platform firmware memory alignment requirements.
  • Persistent capacity that is reserved. This capacity is the persistent memory partition capacity (rounded down for alignment) less any App Direct capacity. Reserved capacity typically results from a Memory Allocation Goal request that specified the Reserved property. This capacity is not mapped to System Physical Address space (SPA).
  • Capacity that is unusable because it has not been configured.
  • PMem module configured capacity but SKU prevents usage. For example, AppDirectCapacity but PMem module SKU is MemoryMode only.
Total Inaccessible Capacity

Total capacity of DDR and PMem module that is inaccessible.

Physical DDR Capacity

Total physical DDR capacity populated on the platform.

Physical PMem module Capacity

Total physical PMem module capacity populated on the platform.

Total Physical Capacity

Total physical capacity populated on the platform.

Details

PMem modules are partitioned into Memory and Persistent partitions. Memory partitions are aligned on a 1 GiB boundary by ipmctl with the Persistent partition consuming the remaining capacity. Any capacity that falls outside the Memory and Persistent partitions is InaccessibleCapacity and is not useable. If the PMem module is configured for 100% Memory Mode, then the Memory partition consumes all of the capacity and the Persistent partition has none.

The mode determines how the DDR capacities are allocated. In 1LM and AppDirect, all DDR capacity is used as additional volatile memory. In MemoryMode, all DDR capacity that the CPU will support is used as a cache for the PMem module.

Platform firmware alignment restrictions may result in some capacity from the Memory and Persistent partitions not mapped to System Physical Address space (SPA). This memory is considered InaccessibleCapacity and is not usable.

The definitions and calculations that follow intend to describe how each of the values are determined.

Definitions:

Intel PMem module Current Config

See the Intel™ Optane™ Persistent Memory Software-Firmware Interface Specification for details.

PMem module Partition Info

PMem module partition information provided by PMem module firmware. See the Intel™ Optane™ Persistent Memory Module Firmware Interface Specification for details.

PMem module Physical Capacity (PC)

Raw capacity (total usable) reported by PMem module Partition Info

PMem module Memory Partition Capacity (MPC)

Volatile capacity reported by PMem module Partition Info

PMem module Persistent Partition Capacity (PPC)

Persistent capacity reported by PMem module Partition Info

PMem module Volatile Memory Capacity (VMC)

Usable volatile memory capacity as reported by platform FW via the Intel PMem module Current Config→Volatile Memory Size Mapped into SPA field

PMem module Persistent Memory Capacity (PMC)

Usable persistent memory capacity as reported by platform FW via the Intel PMem module Current Config→Persistent Memory Size Mapped into SPA field

DDR Total Capacity (DDRTC)

Total amount of memory available for use on the populated DDRs

Calculations:

if (CurrentMode == 1LM) then
  DDRCacheCapacity = 0
  DDRVolatileCapacity = DDRTC
else if (CurrentMode == 2LM) then
  DDRCacheCapacity = DDRTC
  DDRVolatileCapacity = 0
TotalVolatileCapacity = VMC + DDRVolatileCapacity
InaccessibleCapacity = PC - PMC
 if (CurrentMode != 1LM) then
  InaccessibleCapacity -= VMC (rounded down for alignment)

Referenced By

ipmctl(1).

2020-10-15 ipmctl