** Package changed: linux-signed (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Importance: Undecided => Wishlist
** Also affects: linux (Ubuntu Cosmic)
Importance: Wishlist
Status: New
** Changed in: linux (Ubuntu Cosmic)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1792205
Title:
CONFIG_BCH_CONST_PARAMS should be unset
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Cosmic:
Triaged
Bug description:
Quoting lib/bch.c:
* Option CONFIG_BCH_CONST_PARAMS can be used to force fixed values of
* parameters m and t; thus allowing extra compiler optimizations and
providing
* better (up to 2x) encoding performance. Using this option makes sense when
* (m,t) are fixed and known in advance, e.g. when using BCH error correction
* on a particular NAND flash device.
Ubuntu's kernel targets generic hardware, so using this option is not
a good idea.
As a result of this option being enabled, nandsim's option "bch" is
unusable:
[34200.137521] nand: 128 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB
size: 64
[34200.137522] [nandsim] using 8-bit/512 bytes BCH ECC
[34200.137524] bch encoder/decoder was configured to support parameters m=14,
t=4 only!
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Ubuntu 18.04.1 LTS, linux-image-4.15.0-34-generic: 4.15.0-34.37
(amd64)
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