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Johnson, Hartner, & Brantley

Company: IBM Linux Technology Center & Advanced Micro Devices
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Sandra K. Johnson is Manager, Linux performance at the IBM Linux Technology Center in Austin, Texas. She has over 14 years of experience in her broad areas of interest, including the design and performance evaluation of memory systems, cache coherence protocols, parallel I/O, parallel file systems, Java server performance, application server/database integration, and Linux performance. She is a member of the IBM Academy of Technology. Sandra can be reached at

Bill Hartner is the technical lead for the IBM Linux Technology Center Performance Team. Bill has worked in operating systems performance for about 10 years and on Linux performance for about 4 years. Bill can be reached at

Bill Brantley has been involved in UNIX performance since 1985 while at the IBM T. J. Watson Research Center in Yorktown Heights, NY, and then at IBM in Austin, TX. For the last 3 years he has been focused on Linux performance. Currently he is working on x86-64 Linux performance at Advanced Micro Devices. He can be reached at


The first step in improving Linux performance is quantifying it. But how exactly do you quantify performance for Linux or for comparable systems? In this article, members of the IBM Linux Technology Center share their expertise as they describe how they ran several benchmark tests on the Linux 2.4 and 2.5 kernels late last year.

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