| Title: Tickless Idle Support |
| |
| Description: |
| |
| This test verifies the timing accuracy of the tickless idle feature. |
| |
| The test first calibrates itself by repeatedly sleeping for 10 ticks with the |
| tickless idle feature disabled. It then repeats this process with the tickless |
| idle feature enabled. Lastly, it compares the average measured duration of |
| each approach and displays the result. The tick timing is correct if the |
| 'diff ticks' with tickless enabled matches the SLEEP_TICKS (10) setting in |
| the source. |
| |
| The demonstration utilizes microkernel mutex APIs, timers and tickless |
| idle mode. |
| |
| -------------------------------------------------------------------------------- |
| |
| Building and Running Project: |
| |
| This microkernel project outputs to the console. It can be built and executed |
| on QEMU as follows: |
| |
| make qemu |
| |
| -------------------------------------------------------------------------------- |
| |
| Troubleshooting: |
| |
| Problems caused by out-dated project information can be addressed by |
| issuing one of the following commands then rebuilding the project: |
| |
| make clean # discard results of previous builds |
| # but keep existing configuration info |
| or |
| make pristine # discard results of previous builds |
| # and restore pre-defined configuration info |
| |
| -------------------------------------------------------------------------------- |
| |
| Sample Output: |
| |
| Tickless Idle Test |
| Calibrating TSC... |
| Calibrated time stamp period = 0x00000000163adc3a |
| Do the real test with tickless enabled |
| Going idle for 10 ticks... |
| start ticks : 343 |
| end ticks : 353 |
| diff ticks : 10 |
| diff time stamp: 0x0000000018a69898 |
| Cal time stamp: 0x00000000163adc3a |
| variance in time stamp diff: 10 percent |
| =================================================================== |
| PROJECT EXECUTION SUCCESSFUL |
