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How To Fix High CPU Usage by kswapd0 on Ubuntu

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In this article, we’ll be discussing a common issue that many Ubuntu users face – high CPU usage by the kswapd0 process. We’ll delve into what kswapd0 is, why it might be using a large amount of CPU, and how you can fix it.

Quick Answer

To fix high CPU usage by kswapd0 on Ubuntu, you can adjust the swappiness value, increase RAM, close unnecessary programs, and scan for malware.

What is kswapd0?

The kswapd0 process is a kernel thread that manages virtual memory in Linux systems, including Ubuntu. Its main function is to move data between RAM and swap space, which is a section of the hard drive used as an extension of the physical memory. When kswapd0 is using a high amount of CPU, it generally means that your system is under heavy memory pressure and is constantly swapping data between RAM and swap.

Why is kswapd0 Using High CPU?

There can be several reasons for kswapd0 to consume high CPU:

  1. Low RAM: If your system has limited RAM and you are running memory-intensive tasks, kswapd0 may be constantly swapping data to free up RAM space.
  2. High swappiness value: Swappiness is a kernel parameter that determines how aggressively the system swaps data to the swap space. If the swappiness value is set too high, kswapd0 may be triggered frequently, leading to high CPU usage.
  3. Malware or crypto miner: In some cases, high CPU usage by kswapd0 can be a symptom of malware or a crypto miner running on the system. It is important to scan your system for any malicious software.

How to Fix High CPU Usage by kswapd0

Adjust Swappiness

One of the most effective ways to reduce high CPU usage by kswapd0 is to adjust the swappiness value. By default, Ubuntu has a swappiness value of 60, which can be quite aggressive. To reduce the frequency of swapping, you can lower this value.

To check the current swappiness value, open a terminal and run the following command:

cat /proc/sys/vm/swappiness

To change the swappiness value, you need to edit the /etc/sysctl.conf file. You can use any text editor for this, but in this example, we’ll use nano:

sudo nano /etc/sysctl.conf

At the end of the file, add the following line to set the swappiness to 10:


Save and close the file, then reboot your system for the new setting to take effect.

Increase RAM

If your system frequently runs out of RAM, consider upgrading your RAM to provide more memory for your applications. This can help reduce the need for excessive swapping and thus lower the CPU usage by kswapd0.

Close Unnecessary Programs

Another way to reduce memory pressure is to close any unnecessary programs or processes. You can use the top or htop command to check which processes are using the most memory and CPU.

Scan for Malware

If you suspect that malware or a crypto miner is causing the high CPU usage, perform a thorough scan of your system using an antivirus or anti-malware software. There are several free and paid options available for Ubuntu, such as ClamAV and Sophos.


High CPU usage by kswapd0 is usually a sign of memory pressure on your Ubuntu system. By adjusting the swappiness value, increasing RAM, closing unnecessary programs, and scanning for malware, you can mitigate this issue and improve your system’s performance. Remember, it’s always important to monitor your system’s resource usage to prevent such issues from occurring in the future.

How can I check if kswapd0 is causing high CPU usage on my Ubuntu system?

You can check if kswapd0 is causing high CPU usage by opening the terminal and running the command top. Look for the process named kswapd0 in the list, and check its CPU usage percentage. If it is consistently using a high amount of CPU, then kswapd0 is likely the cause of the issue.

Can I completely disable kswapd0 to stop high CPU usage?

It is not recommended to disable kswapd0 entirely, as it plays a crucial role in managing virtual memory and swapping data between RAM and swap space. However, you can adjust the swappiness value to reduce its frequency of operation and lower CPU usage.

Will lowering the swappiness value have any negative effects on my system?

Lowering the swappiness value should not have any negative effects on your system. It simply reduces the aggressiveness of swapping data to the swap space, which can help alleviate memory pressure and lower CPU usage. However, if you set the swappiness value too low, it may result in less efficient memory utilization. It is recommended to experiment with different values and monitor system performance to find the optimal setting for your specific needs.

How can I upgrade my RAM on Ubuntu?

To upgrade your RAM on Ubuntu, you need to physically install new RAM modules in your computer. The process may vary depending on your specific hardware, so it is recommended to refer to the documentation or support resources provided by your computer manufacturer. Once the new RAM is installed, your system should automatically detect and utilize the additional memory.

Can I use a different antivirus or anti-malware software on Ubuntu?

Yes, there are several antivirus and anti-malware software options available for Ubuntu. Some popular choices include ClamAV, Sophos, and Bitdefender. These software can help scan and remove any malware or malicious programs that may be causing high CPU usage. It is important to regularly update and run these software to ensure the security of your system.

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