2015-04-11 07:44:37 +08:00
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Title: test_tickless
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Description:
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This test verifies the timing accuracy of the tickless idle feature.
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The test first calibrates itself by repeatedly sleeping for 10 ticks with the
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tickless idle feature disabled. It then repeats this process with the tickless
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idle feature enabled. Lastly, it compares the average measured duration of
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each approach and displays the result. The tick timing is correct if the
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'diff ticks' with tickless enabled matches the SLEEP_TICKS (10) setting in
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the source.
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The demonstration utilizes microkernel resource APIs, timers and tickless
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idle mode.
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--------------------------------------------------------------------------------
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Building and Running Project:
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This microkernel project outputs to the console. It can be built and executed
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on QEMU as follows:
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make microkernel.qemu
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--------------------------------------------------------------------------------
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2015-06-01 22:30:09 +08:00
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Troubleshooting:
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Problems caused by out-dated project information can be addressed by
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issuing one of the following commands then rebuilding the project:
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make clean # discard results of previous builds
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# but keep existing configuration info
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or
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make pristine # discard results of previous builds
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# and restore pre-defined configuration info
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--------------------------------------------------------------------------------
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2015-04-11 07:44:37 +08:00
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Sample Output:
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Tickless Idle Test
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Calibrating TSC...
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Calibrated time stamp period = 0x00000000163adc3a
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Do the real test with tickless enabled
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Going idle for 10 ticks...
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start ticks : 343
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end ticks : 353
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diff ticks : 10
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diff time stamp: 0x0000000018a69898
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Cal time stamp: 0x00000000163adc3a
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variance in time stamp diff: 10 percent
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===================================================================
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VXMICRO PROJECT EXECUTION SUCCESSFUL
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