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- What: /sys/bus/nd/devices/regionX/nfit/ecc_unit_size
- Date: Aug, 2017
- KernelVersion: v4.14 (Removed v4.18)
- Contact: [email protected]
- Description:
- (RO) Size of a write request to a DIMM that will not incur a
- read-modify-write cycle at the memory controller.
- When the nfit driver initializes it runs an ARS (Address Range
- Scrub) operation across every pmem range. Part of that process
- involves determining the ARS capabilities of a given address
- range. One of the capabilities that is reported is the 'Clear
- Uncorrectable Error Range Length Unit Size' (see: ACPI 6.2
- section 9.20.7.4 Function Index 1 - Query ARS Capabilities).
- This property indicates the boundary at which the NVDIMM may
- need to perform read-modify-write cycles to maintain ECC (Error
- Correcting Code) blocks.
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