Intel's P-State Driver Is Getting Better Tuned For Performance
Written by Michael Larabel in Intel on 27 April 2014 at 06:24 PM EDT. 11 Comments
The Intel P-State driver that's found in modern versions of the Linux kernel as a replacement to the older CPUfreq code is getting tuned for better performance while boasting greater power-savings.

Stratos Karafotis posted a patch for the Intel P-State code today that changes the calculation method for the next pstate. Stratos wrote on the mailing list, "Currently the driver calculates the next pstate proportional to core_busy factor and reverse proportional to current pstate. Change the above method and calculate the next pstate independently of current pstate."

Using a Core i7 3770, this kernel developer tested his P-State findings using the Phoronix Test Suite. He found that the kernel compilation performance was faster by about 1.5% in our benchmark. The overall test time was reduced by about 2.6% while the total energy consumption during a test iteration was lower by about 0.35%.

Let's hope this tuning work will continue and we'll see better performance out of the P-State driver for modern hardware with the Linux 3.16 kernel. Our benchmarks of all the Linux 3.15 kernel changes are forthcoming now that the code for this kernel cycle is starting to stabilize.

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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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