lkml.org 
[lkml]   [2017]   [Sep]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/4] arm: dts: exynos: add exynos5422 cpu capacity-dmips-mhz information
On Wed, Aug 30, 2017 at 03:41:19PM +0100, Dietmar Eggemann wrote:
> The following 'capacity-dmips-mhz' dt property values are used:
>
> Cortex-A15: 1024, Cortex-A7: 539
>
> They have been derived form the cpu_efficiency values:
>
> Cortex-A15: 3891, Cortex-A7: 2048
>
> by scaling them so that the Cortex-A15s (big cores) use 1024.
>
> The cpu_efficiency values were originally derived from the "Big.LITTLE
> Processing with ARM Cortex™-A15 & Cortex-A7" white paper
> (http://www.cl.cam.ac.uk/~rdm34/big.LITTLE.pdf). Table 1 lists 1.9x
> (3891/2048) as the Cortex-A15 vs Cortex-A7 performance ratio for the
> Dhrystone benchmark.
>
> The following platforms are affected once cpu-invariant accounting
> support is re-connected to the task scheduler:
>
> odroidxu3, odroidxu3-lite, odroidxu4
>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Russell King <linux@armlinux.org.uk>
> Cc: Kukjin Kim <kgene@kernel.org>
> Cc: Krzysztof Kozlowski <krzk@kernel.org>
> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
> ---
> arch/arm/boot/dts/exynos5422-cpus.dtsi | 8 ++++++++
> 1 file changed, 8 insertions(+)
>

Thanks, applied.

Best regards,
Krzysztof

\
 
 \ /
  Last update: 2017-09-17 09:38    [W:0.096 / U:2.692 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site