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[C-1-21] MUST meet the gyroscope, accelerometer, and magnetometer related

requirements for android.hardware.hifi_sensors , as specified in section 7.3.9 .

[SR] Are STRONGLY RECOMMENDED to support the android.hardware.sensor.hifi_sensors

feature.

[C-1-22] MUST have end-to-end motion to photon latency not higher than 28 milliseconds.

[SR] Are STRONGLY RECOMMENDED to have end-to-end motion to photon latency not

higher than 20 milliseconds.

[C-1-23] MUST have first-frame ratio, which is the ratio between the brightness of pixels

on the first frame after a transition from black to white and the brightness of white pixels

in steady state, of at least 85%.

[SR] Are STRONGLY RECOMMENDED to have first-frame ratio of at least 90%.

MAY provide an exclusive core to the foreground application and MAY support the

Process.getExclusiveCores API to return the numbers of the cpu cores that are exclusive to the

top foreground application.

If exclusive core is supported, then the core:

[C-2-1] MUST not allow any other userspace processes to run on it (except device drivers

used by the application), but MAY allow some kernel processes to run as necessary.

8. Performance and Power

Some minimum performance and power criteria are critical to the user experience and impact the

baseline assumptions developers would have when developing an app.

8.1. User Experience Consistency

A smooth user interface can be provided to the end user if there are certain minimum requirements to

ensure a consistent frame rate and response times for applications and games. Device

implementations, depending on the device type, MAY have measurable requirements for the user

interface latency and task switching as described in section 2 .

8.2. File I/O Access Performance

Providing a common baseline for a consistent file access performance on the application private

data storage ( /data partition) allows app developers to set a proper expectation that would help their

software design. Device implementations, depending on the device type, MAY have certain

requirements described in section 2 for the following read and write operations:

Sequential write performance . Measured by writing a 256MB file using 10MB write

buffer.

Random write performance . Measured by writing a 256MB file using 4KB write buffer.

Sequential read performance . Measured by reading a 256MB file using 10MB write

buffer.

Random read performance . Measured by reading a 256MB file using 4KB write buffer.

8.3. Power-Saving Modes

If device implementations include features to improve device power management that are included in

AOSP or extend the features that are included in AOSP, they:

[C-1-1] MUST NOT deviate from the AOSP implementation for the triggering,

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