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https://docs.microsoft.com/en-us/windows/win32/sysinfo/acquiring-high-resolution-time-stamps
On a relatively small number of platforms that can't use the TSC register as the QPC basis, for example, for reasons explained in Hardware timer info, acquiring high resolution time stamps can be significantly more expensive than acquiring time stamps with lower resolution.
https://www.at91.com/viewtopic.php?t=27347
May 13, 2019 · One more time: CONFIG_HIGH_RES_TIMERS only enables the upper-half of the framework. By itself this is not sufficient to obtain better resolutions. The bottom half is a driver for the (faster) timer hardware. One more time: All you have to do is use the kernel configuration sama5_defconfig, and you will automatically have 1ns high resolution timers.
https://github.com/zephyrproject-rtos/zephyr/issues/6498
Mar 07, 2018 · In addition to a high-resolution timer API, I imagine users that have the high-frequency clock always-on anyway would like to be able to Kconfigure "_arch_k_cycle_get_32" to use the high-frequency clock instead of the low-frequency clock.
https://rt.wiki.kernel.org/index.php/High_resolution_timers
Dynamic priority support for high resolution timers (extension available in the realtime preemption patch) When realtime preemption is enabled, the delivery of signals at the expiry of itimer and posix interval timers can not be done in the hard interrupt context of the high resolution timer interrupt.
https://www.linuxquestions.org/questions/linux-kernel-70/high-resolution-timer-support-706471/
Nov 20, 2009 · CONFIG_HIGH_RES_TIMERS: x x x x This option enables high resolution timer support. If your x x hardware is not capable then this option only increases x x the size of the kernel image. x x x x Symbol: HIGH_RES_TIMERS [=n] x x Prompt: High Resolution Timer Support x
https://en.wikipedia.org/wiki/High_Precision_Event_Timer
The High Precision Event Timer (HPET) is a hardware timer used in personal computers.It was developed jointly by Intel and Microsoft and has been incorporated in PC chipsets since circa 2005. Formerly referred to by Intel as a Multimedia Timer, the term HPET was selected to avoid confusion with the software multimedia timers introduced in the MultiMedia Extensions to Windows 3.0.
https://www.kernel.org/doc/html/v5.4-rc8/timers/hrtimers.html
The timer wheel code is very good and tight code, there’s zero problems with it in its current usage - but it is simply not suitable to be extended for high-res timers. the unpredictable [O(N)] overhead of cascading leads to delays which necessitate a more complex handling of high resolution timers, which in turn decreases robustness.
https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.stopwatch.ishighresolution
The timer used by the Stopwatch class depends on the system hardware and operating system. IsHighResolution is true if the Stopwatch timer is based on a high-resolution performance counter. Otherwise, IsHighResolution is false, which indicates that the Stopwatch timer is based on the system timer. Applies to See also. Frequency
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