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CONFIG_MTD_UBI_WL_THRESHOLD: UBI wear-leveling threshold

General informations

The Linux kernel configuration item CONFIG_MTD_UBI_WL_THRESHOLD:

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This parameter defines the maximum difference between the highest erase counter value and the lowest erase counter value of eraseblocks of UBI devices. When this threshold is exceeded, UBI starts performing wear leveling by means of moving data from eraseblock with low erase counter to eraseblocks with high erase counter.

The default value should be OK for SLC NAND flashes, NOR flashes and other flashes which have eraseblock life-cycle 100000 or more. However, in case of MLC NAND flashes which typically have eraseblock life-cycle less than 10000, the threshold should be lessened (e.g., to 128 or 256, although it does not have to be power of 2).

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