swh:1:snp:173f8deb0c56c557784b4fd217e7608ac6197844
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Tip revision: c79f46a282390e0f5b306007bf7b11a46d529538 authored by Linus Torvalds on 05 January 2020, 22:23:27 UTC
Linux 5.5-rc5
Linux 5.5-rc5
Tip revision: c79f46a
sysfs-bus-nfit
What: /sys/bus/nd/devices/regionX/nfit/ecc_unit_size
Date: Aug, 2017
KernelVersion: v4.14 (Removed v4.18)
Contact: linux-nvdimm@lists.01.org
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.