系统信息：
$ uname -ra
Linux ubuntu 5.4.0-1022-raspi #25-Ubuntu SMP PREEMPT Thu Oct 15 13:31:49 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux
$ neofetch
.-/+oossssoo+/-. ubuntu<strong i="6">@ubuntu</strong>
`:+ssssssssssssssssss+:` -------------
-+ssssssssssssssssssyyssss+- OS: Ubuntu 20.04.1 LTS aarch64
.ossssssssssssssssssdMMMNysssso. Host: Raspberry Pi 3 Model B Rev 1.2
/ssssssssssshdmmNNmmyNMMMMhssssss/ Kernel: 5.4.0-1022-raspi
+ssssssssshmydMMMMMMMNddddyssssssss+ Uptime: 21 mins
/sssssssshNMMMyhhyyyyhmNMMMNhssssssss/ Packages: 2276 (dpkg), 4 (snap)
.ssssssssdMMMNhsssssssssshNMMMdssssssss. Shell: zsh 5.8
+sssshhhyNMMNyssssssssssssyNMMMysssssss+ Terminal: /dev/pts/0
ossyNMMMNyMMhsssssssssssssshmmmhssssssso CPU: BCM2835 (4) @ 1.200GHz
ossyNMMMNyMMhsssssssssssssshmmmhssssssso Memory: 273MiB / 908MiB
+sssshhhyNMMNyssssssssssssyNMMMysssssss+
.ssssssssdMMMNhsssssssssshNMMMdssssssss.
/sssssssshNMMMyhhyyyyhdNMMMNhssssssss/
+sssssssssdmydMMMMMMMMddddyssssssss+
/ssssssssssshdmNNNNmyNMMMMhssssss/
.ossssssssssssssssssdMMMNysssso.
-+sssssssssssssssssyyyssss+-
`:+ssssssssssssssssss+:`
.-/+oossssoo+/-.
$ sudo systemctl status systemd-swap
● systemd-swap.service - Manage swap spaces on zram, files and partitions.
Loaded: loaded (/lib/systemd/system/systemd-swap.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Mon 2020-10-26 14:44:11 IST; 1min 28s ago
Process: 4422 ExecStart=/usr/bin/systemd-swap start (code=exited, status=1/FAILURE)
Main PID: 4422 (code=exited, status=1/FAILURE)
Oct 26 14:44:09 ubuntu systemd[1]: Starting Manage swap spaces on zram, files and partitions....
Oct 26 14:44:11 ubuntu systemd-swap[4422]: File "/usr/bin/systemd-swap", line 689
Oct 26 14:44:11 ubuntu systemd-swap[4422]: continue
Oct 26 14:44:11 ubuntu systemd-swap[4422]: ^
Oct 26 14:44:11 ubuntu systemd-swap[4422]: SyntaxError: 'continue' not properly in loop
Oct 26 14:44:11 ubuntu systemd[1]: systemd-swap.service: Main process exited, code=exited, status=1/FAILURE
Oct 26 14:44:11 ubuntu systemd[1]: systemd-swap.service: Failed with result 'exit-code'.
Oct 26 14:44:11 ubuntu systemd[1]: Failed to start Manage swap spaces on zram, files and partitions..
Navneet-Suresh
所有11条评论
Ty 报告此事！
vilgotf
于 2020-10-26
🚀1
拉取新更改后，它按预期工作。 感谢您快速修复@vilgotf。
❯ sudo systemctl status systemd-swap.service
● systemd-swap.service - Manage swap spaces on zram, files and partitions.
Loaded: loaded (/lib/systemd/system/systemd-swap.service; enabled; vendor preset: enabled)
Active: active (exited) since Mon 2020-10-26 15:32:11 IST; 17s ago
Process: 2976 ExecStart=/usr/bin/systemd-swap start (code=exited, status=0/SUCCESS)
Main PID: 2976 (code=exited, status=0/SUCCESS)
Status: "Swap unit activation finished"
Oct 26 15:32:10 ubuntu systemd-swap[2976]: INFO: Removing files in /var/lib/systemd-swap/swapfc/...
Oct 26 15:32:11 ubuntu systemd-swap[2976]: INFO: Zswap: backup current configuration: start
Oct 26 15:32:11 ubuntu systemd-swap[2976]: INFO: Zswap: backup current configuration: complete
Oct 26 15:32:11 ubuntu systemd-swap[2976]: INFO: Zswap: set new parameters: start
Oct 26 15:32:11 ubuntu systemd-swap[2976]: INFO: Zswap: Enable: 1, Comp: zstd, Max pool %: 25, Zpool: z3fold
Oct 26 15:32:11 ubuntu systemd-swap[2976]: INFO: Zswap: set new parameters: complete
Oct 26 15:32:11 ubuntu systemd-swap[2976]: INFO: Writing destroy info...
Oct 26 15:32:11 ubuntu systemd-swap[2976]: INFO: swapD: pick up devices from systemd-gpt-auto-generator
Oct 26 15:32:11 ubuntu systemd-swap[2976]: INFO: swapD: searching swap devices
Oct 26 15:32:11 ubuntu systemd[1]: Started Manage swap spaces on zram, files and partitions..
@vilgotf我
❯ free -m
total used free shared buff/cache available
Mem: 908 355 21 9 530 534
Swap: 0 0 0
❯ sudo systemctl status systemd-swap.service
● systemd-swap.service - Manage swap spaces on zram, files and partitions.
Loaded: loaded (/lib/systemd/system/systemd-swap.service; enabled; vendor preset: enabled)
Active: active (exited) since Mon 2020-10-26 15:40:45 IST; 11min ago
Process: 1841 ExecStart=/usr/bin/systemd-swap start (code=exited, status=0/SUCCESS)
Main PID: 1841 (code=exited, status=0/SUCCESS)
Status: "Swap unit activation finished"
Oct 26 15:40:44 ubuntu systemd-swap[1841]: INFO: Removing files in /var/lib/systemd-swap/swapfc/...
Oct 26 15:40:44 ubuntu systemd-swap[1841]: INFO: Zswap: backup current configuration: start
Oct 26 15:40:44 ubuntu systemd-swap[1841]: INFO: Zswap: backup current configuration: complete
Oct 26 15:40:44 ubuntu systemd-swap[1841]: INFO: Zswap: set new parameters: start
Oct 26 15:40:44 ubuntu systemd-swap[1841]: INFO: Zswap: Enable: 1, Comp: zstd, Max pool %: 25, Zpool: z3fold
Oct 26 15:40:44 ubuntu systemd-swap[1841]: INFO: Zswap: set new parameters: complete
Oct 26 15:40:44 ubuntu systemd-swap[1841]: INFO: Writing destroy info...
Oct 26 15:40:44 ubuntu systemd-swap[1841]: INFO: swapD: pick up devices from systemd-gpt-auto-generator
Oct 26 15:40:45 ubuntu systemd-swap[1841]: INFO: swapD: searching swap devices
Oct 26 15:40:45 ubuntu systemd[1]: Started Manage swap spaces on zram, files and partitions..
❯ zramctl
~ ❯
如果我使用 zram-tools 包，我可以毫无问题地启动和运行 zram。
Navneet-Suresh
于 2020-10-26
systemd-swap status和您的配置文件的输出是什么？
vilgotf
于 2020-10-26
我正在使用默认配置文件。
❯ sudo cat /etc/systemd/swap.conf
# This file is part of systemd-swap.
#
# Entries in this file show the systemd-swap defaults as
# specified in /usr/share/systemd-swap/swap-default.conf
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See swap.conf(5) and /usr/share/systemd-swap/swap-default.conf for details.
#zswap_enabled=1
#zswap_compressor=zstd
#zswap_max_pool_percent=25
#zswap_zpool=z3fold
#zram_enabled=0
#zram_size=$(( RAM_SIZE / 4 ))
#zram_count=${NCPU}
#zram_streams=${NCPU}
#zram_alg=zstd
#zram_prio=32767
#swapfc_enabled=0
#swapfc_force_use_loop=0
#swapfc_frequency=1
#swapfc_chunk_size=256M
#swapfc_max_count=32
#swapfc_min_count=0
#swapfc_free_ram_perc=35
#swapfc_free_swap_perc=15
#swapfc_remove_free_swap_perc=55
#swapfc_priority=50
#swapfc_path=/var/lib/systemd-swap/swapfc/
#swapfc_nocow=1
#swapfc_directio=1
#swapfc_force_preallocated=0
#swapd_auto_swapon=1
#swapd_prio=1024
################################################################################
# Defaults are optimized for general usage
################################################################################
################################################################################
# You can override any settings with files in:
# /etc/systemd/swap.conf.d/*.conf
################################################################################
################################################################################
# Zswap
#
# Kernel >= 3.11
# Zswap create compress cache between swap and memory to reduce IO
# https://www.kernel.org/doc/Documentation/vm/zswap.txt
zswap_enabled=1
zswap_compressor=zstd # lzo lz4 zstd lzo-rle lz4hc
zswap_max_pool_percent=25 # 1-99
zswap_zpool=z3fold # zbud z3fold (note z3fold requires kernel 4.8+)
################################################################################
# ZRam
#
# Kernel >= 3.15
# Zram compression streams count for additional information see:
# https://www.kernel.org/doc/Documentation/blockdev/zram.txt
zram_enabled=0
zram_size=$(( RAM_SIZE / 4 )) # This is 1/4 of ram size by default.
zram_count=${NCPU} # Device count (only for kernels < 4.8)
zram_streams=${NCPU} # Compress streams
zram_alg=zstd # See $zswap_compressor
zram_prio=32767 # 1 - 32767
################################################################################
# Swap File Chunked
# Allocate swap files dynamically
# For btrfs fallback to swapfile + loop will be used
# ex. Min swap size 256M, Max 32*256M
swapfc_enabled=0
swapfc_force_use_loop=0 # Force usage of swapfile + loop
swapfc_frequency=1 # How often to check free swap space in seconds
swapfc_chunk_size=256M # Size of swap chunk
swapfc_max_count=32 # Note: 32 is a kernel maximum
swapfc_min_count=0 # Minimum amount of chunks to preallocate
swapfc_free_ram_perc=35 # Add first chunk if free ram < 35%
swapfc_free_swap_perc=15 # Add new chunk if free swap < 15%
swapfc_remove_free_swap_perc=55 # Remove chunk if free swap > 55% && chunk count > 2
swapfc_priority=50 # Priority of swapfiles (decreasing by one for each swapfile).
swapfc_path=/var/lib/systemd-swap/swapfc/
# Only for swapfile + loop
swapfc_nocow=1 # Disable CoW on swapfile
swapfc_directio=1 # Use directio for loop dev
swapfc_force_preallocated=0 # Will preallocate created files
################################################################################
# Swap devices
# Find and auto swapon all available swap devices
swapd_auto_swapon=1
swapd_prio=1024
❯ sudo systemd-swap status
. compressor zstd
. enabled Y
. max_pool_percent 25
. same_filled_pages_enabled Y
. zpool z3fold
Zswap:
. . duplicate_entry 0
. . pool_limit_hit 0
. . pool_total_size 0
. . reject_alloc_fail 0
. . reject_compress_poor 0
. . reject_kmemcache_fail 0
. . reject_reclaim_fail 0
. . same_filled_pages 0
. . stored_pages 0
. . written_back_pages 0
. . compress_ratio 0%
swapD:
~ ❯
我的 fstab 看起来像这样。
❯ cat /etc/fstab
LABEL=writable / ext4 defaults 0 0
LABEL=system-boot /boot/firmware vfat defaults 0 1
tmpfs /var/log tmpfs size=200M,defaults,noatime,mode=0755 0 0
tmpfs /var/cache/apt/archives tmpfs size=500M,defaults,noexec,nosuid,nodev,mode=0755 0 0
#tmpfs /var/spool/cups tmpfs size=100M,defaults,noatime,mode=0755 0 0
#tmpfs /var/spool/cups/tmp tmpfs defaults,noatime,mode=0755 0 0
好像你的 conf 文件是新的（顶部）和旧的（底部）的混合，我建议删除文件并重新安装包（重新安装 conf 文件）。
默认情况下，zram 和 swapfc 都是禁用的，因此您需要启用它们才能正常工作；)
vilgotf
于 2020-10-26
❤1
👍1
因为systemd-swap status的输出没有提到 zram 和 swapfc 意味着它们被禁用
vilgotf
于 2020-10-26
👀1
❤1
哦好的，知道了。
Navneet-Suresh
于 2020-10-26
好的现在工作！
❯ sudo systemctl status systemd-swap.service
● systemd-swap.service - Manage swap spaces on zram, files and partitions.
Loaded: loaded (/lib/systemd/system/systemd-swap.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2020-10-26 16:09:13 IST; 40s ago
Main PID: 2771 (systemd-swap)
Status: "Monitoring memory status..."
Tasks: 1 (limit: 974)
CGroup: /system.slice/systemd-swap.service
└─2771 /usr/bin/python3 -u /usr/bin/systemd-swap start
Oct 26 16:09:07 ubuntu systemd-swap[2771]: INFO: Zram: not part of kernel, trying to find zram module
Oct 26 16:09:07 ubuntu systemd-swap[2771]: INFO: Zram: module successfully loaded
Oct 26 16:09:10 ubuntu systemd-swap[2771]: INFO: Zram: trying to initialize free device
Oct 26 16:09:10 ubuntu systemd-swap[2771]: INFO: Zram: initialized: /dev/zram0
Oct 26 16:09:13 ubuntu systemd-swap[2771]: INFO: Writing destroy info...
Oct 26 16:09:13 ubuntu systemd-swap[2771]: INFO: swapD: pick up devices from systemd-gpt-auto-generator
Oct 26 16:09:13 ubuntu systemd-swap[2771]: INFO: swapD: searching swap devices
Oct 26 16:09:13 ubuntu systemd-swap[2771]: INFO: swapFC: on-demand swap activation at >590 MiB memory usage
Oct 26 16:09:13 ubuntu systemd[1]: Started Manage swap spaces on zram, files and partitions..
Oct 26 16:09:14 ubuntu systemd-swap[2771]: INFO: swapFC: free ram: 3 < 35 - allocate chunk: 1
❯ zramctl
NAME ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram0 zstd 227.1M 4K 57B 4K 4 [SWAP]
❯ free -m
total used free shared buff/cache available
Mem: 908 369 22 7 515 509
Swap: 483 15 467
我的配置
❯ sudo cat /etc/systemd/swap.conf
# This file is part of systemd-swap.
#
# Entries in this file show the systemd-swap defaults as
# specified in /usr/share/systemd-swap/swap-default.conf
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See swap.conf(5) and /usr/share/systemd-swap/swap-default.conf for details.
zswap_enabled=1
zswap_compressor=zstd
zswap_max_pool_percent=25
zswap_zpool=z3fold
zram_enabled=1
zram_size=$(( RAM_SIZE / 4 ))
zram_count=${NCPU}
zram_streams=${NCPU}
zram_alg=zstd
zram_prio=32767
swapfc_enabled=1
swapfc_force_use_loop=0
swapfc_frequency=1
swapfc_chunk_size=256M
swapfc_max_count=32
swapfc_min_count=0
swapfc_free_ram_perc=35
swapfc_free_swap_perc=15
swapfc_remove_free_swap_perc=55
swapfc_priority=50
swapfc_path=/var/lib/systemd-swap/swapfc/
swapfc_nocow=1
#swapfc_directio=1
#swapfc_force_preallocated=0
swapd_auto_swapon=1
swapd_prio=1024
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最有用的评论
好像你的 conf 文件是新的（顶部）和旧的（底部）的混合，我建议删除文件并重新安装包（重新安装 conf 文件）。
默认情况下，zram 和 swapfc 都是禁用的，因此您需要启用它们才能正常工作；)