1. ################################################################################
2. # Defaults are optimized for general usage
3. ################################################################################
4.  
5. ################################################################################
6. # You can override any settings by files in:
7. # /etc/systemd/swap.conf.d/*.conf
8. ################################################################################
9.  
10. ################################################################################
11. # Zswap
12. #
13. # Kernel >= 3.11
14. # Zswap create compress cache between swap and memory for reduce IO
15. # https://www.kernel.org/doc/Documentation/vm/zswap.txt
16.  
17. zswap_enabled=1
18. zswap_compressor=zstd     # lzo lz4 zstd lzo-rle lz4hc
19. zswap_max_pool_percent=25 # 1-99
20. zswap_zpool=z3fold        # zbud z3fold (note z3fold requires kernel 4.8+)
21.  
22. ################################################################################
23. # ZRam
24. #
25. # Kernel >= 3.15
26. # Zram compression streams count for additional information see:
27. # https://www.kernel.org/doc/Documentation/blockdev/zram.txt
28.  
29. zram_enabled=0
30. zram_size=$(($RAM_SIZE/4))      # This is 1/4 of ram size by default.
31. zram_count=${NCPU}              # Device count (only for kernels < 4.8)
32. #zram_streams=${NCPU}           #$NCPU
33. zram_alg=zstd #lz4              # See $zswap_compressor 842 - for Linux 4.8.4
34. zram_prio=32767                 # 1 - 32767
35.  
36. ################################################################################
37. # Swap File Chunked
38. # Allocate swap files dynamically
39. # For btrfs fallback to swapfile + loop will be used
40. # ex. Min swap size 512M, Max 8*512M
41. swapfc_enabled=1
42. swapfc_force_use_loop=0          # Force usage of swapfile + loop
43. swapfc_frequency=1               # How often to check free swap space in seconds
44. swapfc_chunk_size=512M           # Size of swap chunk
45. swapfc_max_count=16              # 0 - unlimited, note: 32 is a kernel maximum
46. swapfc_min_count=0               # Minimum amount of chunks to preallocate
47. swapfc_free_ram_perc=35          # Add first chunk if free ram < 35%
48. swapfc_free_swap_perc=15         # Add new chunk if free swap < 15%
49. swapfc_remove_free_swap_perc=55  # Remove chunk if free swap > 55% && chunk count > 2
50. swapfc_priority=50               # Priority of swapfiles (decreasing by one for each swapfile).
51. swapfc_path=/var/lib/systemd-swap/swapfc/
52. # Only for swapfile + loop
53. swapfc_nocow=1              # Disable CoW on swapfile
54. swapfc_directio=1           # Use directio for loop dev
55. swapfc_force_preallocated=0 # Will preallocate created files
56.  
57. ################################################################################
58. # Swap devices
59. # Find and auto swapon all available swap devices
60. swapd_auto_swapon=0
61. swapd_prio=1024
62.  
63.