> This and kernel compression are the two pieces that worry me a little. > LZO is still probably one of the best speed/size compromises and was > the reason it was added to jffs2. I'm not sure there are many devices > that still use flash directly via jffs2 but this probably still does > have a use there. Obviously it would still be in meta-oe but I'm > worried the "off by default" will catch out a few old BSPs and be a > pain to enable. At lot of this history was paged out in long term > storage!
Enabling should just be a matter of pulling in meta-oe and flipping the packageconfigs, so I don’t see this as a huge problem. Looking in the time machine that is meta-handheld, I see the zaurus machines turn on LZO in the JFFS2 kernel module, but they also build UBIFS images which explicitly use zlib instead of lzo. UBIFS also support Zstd now, so that’s probably a better option all around: it compresses almost as well as zlib but almost as fast as lzo[1]. Ross [1] from btrfs benchmarks at https://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs.git/commit/?h=next&id=5c1aab1dd5445ed8bdcdbb575abc1b0d7ee5b2e7
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