Enable ZRAM while disabling swap file in Zorin OS

demo

To optimize memory performance in Zorin OS, it is recommended to enable ZRAM while disabling the traditional disk-based swap file, as ZRAM creates a compressed swap space in RAM that is significantly faster and reduces lag.

Enabling ZRAM
Install the necessary tools and configure the compression algorithm and memory percentage:

1. sudo apt install zram-tools
   
2. echo -e "ALGO=zstd\nPERCENT=70" | sudo tee -a /etc/default/zramswap
   
3. sudo service zramswap reload

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Disabling Traditional Swap
To prevent conflict and ensure ZRAM is used exclusively, disable the existing swap file:

• Open /etc/fstab and comment out the swap line (e.g., #/swapfile).
• Run sudo swapoff /swapfile to deactivate it immediately.
• Reboot the system to apply changes.
  

Optimizing Swappiness
Set the swappiness value to 10 to prioritize RAM usage and reduce swap activity, which improves responsiveness:

1. echo 'vm.swappiness=10' | sudo tee /etc/sysctl.d/99-swappiness.conf
   
2. sudo sysctl -p /etc/sysctl.d/99-swappiness.conf

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Setup Zswap in Zorin OS

To setup zswap on Zorin OS, you must first ensure a swap file exists, then configure the kernel parameters in GRUB to enable compression and memory pooling.

1. Verify or Create Swap File

Zorin OS typically uses a swap file. Verify it exists with free -h. If missing, create one:

1. <blockquote>sudo fallocate -l 4G /swapfile

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2. Configure GRUB for Zswap

Edit the GRUB configuration to enable zswap with the lz4 compressor and z3fold pool:

1. sudo nano /etc/default/grub

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Add the following to the GRUB_CMDLINE_LINUX_DEFAULT line:

1. zswap.enabled=1 zswap.compressor=lz4 zswap.max_pool_percent=50 zswap.zpool=z3fold

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Save the file and update GRUB:

1. sudo update-grub   

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3. Update Initramfs

Ensure the compression modules are loaded at boot:

1. sudo su
   
2. echo lz4 >> /etc/initramfs-tools/modules
   
3. echo lz4_compress >> /etc/initramfs-tools/modules
   
4. echo z3fold >> /etc/initramfs-tools/modules
   
5. update-initramfs -u
   
6. exit

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4. Reboot and Verify

Reboot your system. Verify zswap is active by running:

1. cat /sys/module/zswap/parameters/enabled   

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A output of Y confirms zswap is enabled.  You can check compression ratios and pool usage via /sys/kernel/debug/zswap/.

来自圈子: Demo俱乐部