Intel Bay Trail & Cherry Trail CPUs To Run Faster With Linux 4.1
Written by Michael Larabel in Intel on 26 April 2015 at 10:12 AM EDT. Add A Comment
INTEL --
While the big ACPI and power management changes were sent in more than one week ago for the Linux 4.1 kernel, another batch of ACPI/PM work was sent in this weekend. One of these last-minute changes should end up significantly benefiting the performance of modern Intel Atom Bay/Cherry Trail SoCs.

Of the few last minute ACPI/PM 4.1 changes is a tweak to the Intel P-State driver that changes the setpoint for Intel Atom hardware. With dropping the setpoint from 97 to 60, the P-State CPU frequency scaling driver will be much more aggressive in changing (increasing) the power/performance states when encountering load. Intel's Kristen Carlson Accardi says this change "improves performance on a variety of workloads with little power penalty." Unfortunately, no benchmarks were published, but I'll work on some new Bay Trail numbers once the Linux 4.1 kernel is further along.


This second ACPI/PM pull request for Linux 4.1 also adds Intel Skylake processor support to the RAPL power-capping driver.
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Michael Larabel is the principal author of Phoronix.com 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 OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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