IBM: Memory Power Management Savings Measurable
Written by Michael Larabel in Hardware on 12 November 2013 at 05:13 PM EST. 6 Comments
An IBM Linux Technology Center has shared that enabling experimental memory power management within the Linux kernel has dropped one of their test system's power consumption by about 2.6% but it's likely even more with experimental hardware.

Srivatsa S. Bhat of IBM had presented at the Kernel Summit and then today shared his power experiments from his machine. First of all, his machine isn't what most people will ever experience: an IBM Power 7 system with four CPUs making up 32 cores and there's 128GB of RAM. With this system, testing out kernel power memory management had dropped his system's power consumption by up to 2.6%.

While this hardware is a bit extreme with 32 cores and 128GB of RAM, it isn't even an ideal system as there's only four memory regions for handling power savings. Srivatsa said there's prototype IBM hardware that can handle more memory regions and lower base power consumption where he believes the system power savings could be up to 5% with this feature.

For those not familiar with the active work on memory power savings by the Linux kernel, see Linux Kernel Power Management Targeting Memory. Srivatsa's findings can be found on the kernel mailing list with more details.

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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter or contacted via

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