By Topic

Operating system exploitation of the POWER5 system

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $31
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Mackerras, P. ; IBM Linux Technology Center OzLabs, 8 Brisbane Avenue CA03, Canberra ACT 2611 Australia ; Mathews, T.S. ; Swanberg, R.C.

The POWER5™ system incorporates several features designed to improve performance by eliminating bottlenecks and accelerating common functions used in operating systems. This paper discusses how two of the supported operating systems for POWER5—AIX® and Linux™—make use of these features to deliver improved system scalability and performance. In particular, the overheads for synchronizing translation-lookaside buffer (TLB) invalidations between processors, and for ensuring that the instruction cache is kept coherent by software, have been removed. The POWER5 simultaneous multithreading (SMT) implementation has features which allow operating systems to optimize the system for the kinds of applications being executed. We discuss how the operating systems approach the problems of scheduling tasks across the system, of determining when to switch processors between single-threaded (ST) and SMT mode, and of accounting accurately for CPU usage when in the SMT mode.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:49 ,  Issue: 4.5 )