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ross_cc
n00b
Joined: 29 Jul 2020
Posts: 17
Location: Manila
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 Posted: Wed Jul 29, 2020 5:01 am Post subject: Tip: enable F2FS compression on Raspberry Pi |
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Starting from linux 5.6, F2FS has added file-system compression support. This is a succinct intro to use this newest feature on your Pi:
1. Build the kernel for version 5.6+ (5.7+ for zstd compression support) for both your host machine and Pi, and make sure to enable the options for F2FS compression support.
2. Build f2fs-tools. Since the version on gentoo tree (sys-fs/f2fs-tools-1.13.0) is outdated and does not support making compression-enabled filesystems, you have to build directly from the upstream source: https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-tools.git.
3. Format the designed partition with compression attribute enabled: | Code: | | mkfs.f2fs -O extra_attr,compression /dev/<partition> -f |
. (this will erase everything on this partition, so make sure you have needed files backed up beforehand)
4. Now you can mount the partition with compression enabled: | Code: | | mount -o compress_algorithm=lz4/lzo/zstd /dev/<partition> /mnt/<mountpoint> |
. (now it's the time you can restore the backed up files)
5. Modify /etc/fstab and append | Code: | | ,compress_algorithm=lz4/lzo/zstd |
to the 4th column on the corresponding partition.
6. (If the partition happens to serve as rootfs) Append | Code: | | rootfstype=f2fs rootflags=compress_algorithm=lz4/lzo/zstd |
on cmdline.txt.
Feel free to ask me to elaborate if you have any apprehensions:-) |
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Antikapitalista
n00b
Joined: 18 Apr 2011
Posts: 16
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| Posted: Tue Sep 08, 2020 9:30 am Post subject: |
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And does it actually make any difference?
The code is architecture-agnostic, I have not tried this on anything ARM-related, only on AMD64 so far, the partition can be formatted and mounted properly, using zstd compression, enabled in the kernel; everything seemingly works, the compression attribute can be set and is inherited,etc., but there are no noticeable space savings; tested with plain text files as well as object code files.
So far, f2fs compression seems like snake oil to me.
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On a warpath against the North Atlantic Terrorist Organization. |
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Ant P.
Watchman
Joined: 18 Apr 2009
Posts: 6868
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| Posted: Tue Sep 08, 2020 9:59 am Post subject: |
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zstd makes a very significant difference on btrfs, it should be the same for f2fs:
| Code: | /usr/share # compsize .
Processed 87689 files, 39573 regular extents (40152 refs), 60656 inline.
Type Perc Disk Usage Uncompressed Referenced
TOTAL 62% 1.8G 3.0G 3.0G
none 100% 1.1G 1.1G 1.1G
zstd 39% 760M 1.8G 1.9G
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Gentoo on ARM
