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1What: /sys/bus/nd/devices/regionX/nfit/ecc_unit_size
2Date: Aug, 2017
3KernelVersion: v4.14 (Removed v4.18)
4Contact: nvdimm@lists.linux.dev
5Description:
6 (RO) Size of a write request to a DIMM that will not incur a
7 read-modify-write cycle at the memory controller.
8
9 When the nfit driver initializes it runs an ARS (Address Range
10 Scrub) operation across every pmem range. Part of that process
11 involves determining the ARS capabilities of a given address
12 range. One of the capabilities that is reported is the 'Clear
13 Uncorrectable Error Range Length Unit Size' (see: ACPI 6.2
14 section 9.20.7.4 Function Index 1 - Query ARS Capabilities).
15 This property indicates the boundary at which the NVDIMM may
16 need to perform read-modify-write cycles to maintain ECC (Error
17 Correcting Code) blocks.