this post was submitted on 20 Jul 2025
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Lightweight Block Compression Device Mapper? (lemmy.world)
submitted 1 week ago* (last edited 1 week ago) by RealBot@lemmy.world to c/linux@lemmy.world
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I can't find some lightweight dm compression layer. Only one i found is VDO and for some reason it uses a lot of memory to operate (on the order of 500 MiB). Why is that? My idea was to use it on a normal laptop/pc that does not have a lot of memory to waste. Only other alternative is btrfs, but it is already slow by itself (compared to other fs like ext4). Idealy what i would want is something like ext4 on VDO (only compression with VDO, and of course there would be LVM in there), only problem with this is that VDO is heavy on memory.

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[–] tal@lemmy.today 3 points 1 week ago

only problem with this is that VDO is heavy on memory.

Sounds like there are some tunable levers on memory usage, though I expect that you'll probably have a performance tradeoff.

https://man7.org/linux/man-pages/man7/lvmvdo.7.html