Comparison: Linux Disk Scheduler

Posted on in Categories Hardware, Links, Linux, News last updated August 9, 2008

I’ve already written about changing the I/O scheduler for hard disk under Linux and avoiding sudden outburst of disk I/O using ionice utility. Google has sponsored [email protected] to take a close look at the disk schedulers in Linux, particularly when combined with RAID. They have now published their findings.

Programming: Understanding Linux Completely Fair Scheduler

Posted on in Categories Links, Linux, programming last updated January 11, 2008

The new Linux scheduler extends scheduling capabilities by introducing scheduling classes and also simplifies debugging by improving schedule statistics. Completely Fair Scheduler (CFS) is getting good reviews when tested for thread-intensive applications including 3D games. CFS handles CPU resource allocation for executing processes, and aims to maximize overall CPU utilization while maximizing interactive performance. CFS considered as the first implementation of a fair queuing process scheduler in a widely used general-purpose operating system.

The Linux 2.6.23 kernel comes with a modular scheduler core and a CFS, which is implemented as a scheduling module. In this article, get acquainted with the major features of the CFS, see how it works, and look ahead to some of the expected changes for the 2.6.24 release.

=> Introducing the CFS for Linux