Red Hat ENTERPRISE LINUX AS 2.1 - Guide d'installation télécharger pdf (Page 18)

Chapter 5. Memory Usage and Page Cache

Alternatively, you can use sysctl(8) to change it:

# sysctl -w vm.pagecache="1 15 30"

To make the change permanent, add the following line to the file /etc/sysctl.conf. This file is

used during the boot process.

# echo "vm.pagecache=1 15 30" >> /etc/sysctl.conf

With Red Hat Enterprise Linux 4 and 5, the pagecache is dynamically adjusted. You can adjust the

minimum free pages using the following command:

# echo 1024 > /proc/sys/vm/min_free_kbytes

To make the change permanent, add the following line to the file /etc/sysctl.conf:

# echo vm.min_free_kbytes=1024 >> /etc/sysctl.conf

The pagecache pages can be reclaimed by adjusting the swappiness percentage as described in

the next section.

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Red Hat ENTERPRISE LINUX AS 2.1 - Guide d'installation Page 18