No seu servidor Ubuntu você tem um total de 1,38 GB de swap para 128 GB de RAM .
Na sua tela o sistema está usando 970 MB de swap para 14,9 GB de RAM , na minha opinião é uma quantidade padrão de swap usada pelo sistema e muito menos para o 14,9 GB de RAM.
No entanto, é um bom ponto para evitar que o seu kernel Linux seja trocado porque na verdade é um processo "caro" em relação ao seu impacto geral no desempenho do sistema.
Aqui gostaria de sugerir para ajustar a quantidade de swappiness no sistema , por favor, encontrar as seguintes informações para o FAQ do Ubuntu :
What is swappiness and how do I change it?
The swappiness parameter controls the tendency of the kernel to move processes out of physical memory and onto the swap disk. Because disks are much slower than RAM, this can lead to slower response times for system and applications if processes are too aggressively moved out of memory.
swappiness can have a value of between 0 and 100
swappiness=0 tells the kernel to avoid swapping processes out of physical memory for as long as possible
swappiness=100 tells the kernel to aggressively swap processes out of physical memory and move them to swap cache
The default setting in Ubuntu is swappiness=60. Reducing the default value of swappiness will probably improve overall performance for a typical Ubuntu desktop installation. A value of swappiness=10 is recommended, but feel free to experiment. Note: Ubuntu server installations have different performance requirements to desktop systems, and the default value of 60 is likely more suitable.
To check the swappiness value
cat /proc/sys/vm/swappiness
To change the swappiness value A temporary change (lost on reboot) with a swappiness value of 10 can be made with
sudo sysctl vm.swappiness=10
To make a change permanent, edit the configuration file with your favorite editor:
gksudo gedit /etc/sysctl.conf
Search for vm.swappiness and change its value as desired. If vm.swappiness does >not exist, add it to the end of the file like so:
vm.swappiness=10
Save the file and reboot.