Tuning network and vm settings on CentOS Linux servers with ktune

While poking around the CentOS package repository, I came across the ktune package. Ktune comes with a set of kernel tunables that are useful for network and disk intensive workloads, and provides the ktune service to apply these settings during system startup. Ktune includes settings for TCP/IP buffers, setting the deadline scheduler as the default I/O scheduler, and entries to adjust the swappiness, dirty_ratio and pagecache settings. The full list of tunables can be viewed by paging through the following two configuration files:

$ less /etc/sysctl.ktune

$ less /etc/sysconfig/ktune

To activate the settings, you can enable the ktune service with the chkconfig and service utilities:

$ chkconfig ktune on

$ service ktune start

Saving current sysctl settings:                            [  OK  ]
Applying ktune sysctl settings from /etc/sysctl.ktune:     [  OK  ]
Applying sysctl settings from /etc/sysctl.conf:            [  OK  ]
Applying deadline elevator: sda                            [  OK  ]

This is an awesome package, and I definitely plan to use the network settings on all of my CentOS hosts.

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