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List:       fedora-devel-list
Subject:    Re: Btrfs by default, the compression option
From:       "Artem Tim" <ego.cordatus () gmail ! com>
Date:       2020-08-01 12:42:58
Message-ID: 20200801124258.9607.43087 () mailman01 ! iad2 ! fedoraproject ! org
[Download RAW message or body]

@Chris, thanks, i did some tests and now we have some numbers. tl;rd the results is \
pretty satisfying me, even if there no speedup in my case, but there is a lot disk \
space could be saved and reduce writes. Probably not worth file a bug, but a little \
bit weird that with zstd:1 still a little bit slower on HDD and on SSD speed equal.

---

! Note: please use monospace font to save formatting.

CPU:            Quad Core AMD Athlon X4 845
Kernel:         5.7.11-200.fc32.x86_64 (non-debug)
btrfs-progs:    5.7-4
Scheduler:      mq-deadline
Mount options:
- HDD: rw,relatime,seclabel,space_cache=v2,autodefrag
- SSD: rw,relatime,seclabel,compress=lzo,ssd,space_cache=v2

To produce more precise results do some things before:

  - Disable ZRAM:
    sudo systemctl stop zram-swap.service

  - Download all necessary packages before build to exclude time required for \
downloading package from internet. After that you can run mock with '--offline' \
option.

  - Before every benchmark clean-up mock:
    mock --isolation=simple clean -r fedora-32-x86_64

## How to reproduce?

1. git clone https://src.fedoraproject.org/rpms/gnome-flashback.git
2. cd gnome-flashback/
3. spectool -g gnome-flashback.spec
4. mock --isolation=simple -r fedora-32-(uname -m) --rebuild --sources . --spec \
gnome-flashback.spec --offline

## Results (HDD)

### Compression:    lzo
Took:               6m53s

Processed 42492 files, 24340 regular extents (26282 refs), 24114 inline.
Type       Perc     Disk Usage   Uncompressed Referenced  
TOTAL       63%      992M         1.5G         1.7G       
none       100%      389M         389M         442M       
lzo         50%      603M         1.1G         1.3G

### Compression:    zstd:1
Took:               7m5s

Processed 42492 files, 24232 regular extents (26219 refs), 24861 inline.
Type       Perc     Disk Usage   Uncompressed Referenced  
TOTAL       46%      738M         1.5G         1.7G       
none       100%      280M         280M         317M       
zstd        35%      458M         1.2G         1.4G

### Compression:    zstd:3
Took:               7m8s

Processed 42492 files, 24104 regular extents (26059 refs), 24940 inline.
Type       Perc     Disk Usage   Uncompressed Referenced  
TOTAL       45%      707M         1.5G         1.7G       
none       100%      270M         270M         306M       
zstd        33%      437M         1.2G         1.4G 

### Compression:    none
Took:               7m18s

## Various combinations with aditional tweaks:

### Compression:            zstd:1
Addtional mount options:    noautodefrag
Took:                       7m3s

### Compression:            zstd:1
Addtional mount options:    noatime
Took:                       7m1s

---

## Results (SSD)

### Compression:    lzo
Took:               2m26s

### Compression:    zstd:1
Took:               2m26s

### Compression:    zstd:3
Took:               2m28s

### Compression:    zstd:14
Took:               4m9s

Processed 42495 files, 25883 regular extents (27868 refs), 25013 inline.
Type       Perc     Disk Usage   Uncompressed Referenced  
TOTAL       42%      673M         1.5G         1.7G       
none       100%      272M         272M         310M       
zstd        30%      401M         1.2G         1.4G 

### Compression:    none
Took:               2m24s
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