What: /sys/bus/nd/devices/regionX/nfit/ecc_unit_size
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Date: Aug, 2017
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KernelVersion: v4.14 (Removed v4.18)
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Contact: linux-nvdimm@lists.01.org
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Description:
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(RO) Size of a write request to a DIMM that will not incur a
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read-modify-write cycle at the memory controller.
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When the nfit driver initializes it runs an ARS (Address Range
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Scrub) operation across every pmem range. Part of that process
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involves determining the ARS capabilities of a given address
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range. One of the capabilities that is reported is the 'Clear
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Uncorrectable Error Range Length Unit Size' (see: ACPI 6.2
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section 9.20.7.4 Function Index 1 - Query ARS Capabilities).
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This property indicates the boundary at which the NVDIMM may
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need to perform read-modify-write cycles to maintain ECC (Error
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Correcting Code) blocks.
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