High speed timer windows

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Language supported English United States. Additional terms Terms of transaction. For example, for Windows running on an x86 processor, the default interval between system clock ticks is typically about 15 milliseconds, and the minimum interval between system clock ticks is about 1 millisecond. If a driver specifies a relative expiration time for a default-resolution timer, the timer can expire up to about 15 milliseconds earlier or later than the specified expiration time. If a driver specifies a relative expiration time for a high-resolution timer, the timer can expire as late as about a millisecond after the specified expiration time but it never expires early.

For more information about the relationship between system clock resolution and timer accuracy, see Timer Accuracy. If no high-resolution timers are set, the operating system typically runs the system clock at its default rate.

However, if one or more high-resolution timers are set, the operating system might need to run the system clock at its maximum rate for at least a part of the time before these timers expire. To avoid unnecessarily increasing power consumption, the operating system runs the system clock at its maximum rate only when necessary to satisfy the timing requirements of high-resolution timers. For example, if a high-resolution timer is periodic, and its period spans several default system clock ticks, the operating system might run the system clock at its maximum rate only in the part of the timer period that immediately precedes each expiration.

For the rest of the timer period, the system clock runs at its default rate. To prevent excessive power consumption, drivers should avoid setting the period of a long-running high-resolution timer to a value that is less than the default interval between system clock ticks.

Otherwise, the operating system is forced to continuously run the system clock at its maximum rate. Starting with Windows 8, a driver can call the ExQueryTimerResolution routine to get the range of timer resolutions that are supported by the system clock.

Starting with Windows , a driver can call the ExSetTimerResolution routine to change the time interval between successive system clock interrupts. For example, a driver can call this routine to change the system clock from its default rate to its maximum rate to improve timer accuracy.

Can confirm the post by laurent above. Especially Floating point performance was half of what it is capable of. I now have a much better CPU mark of Save my name, email, and website in this browser for the next time I comment. Please click on the following link to open the newsletter signup page: Ghacks Newsletter Sign up. Ghacks is a technology news blog that was founded in by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.

Search for:. Martin Brinkmann. Find out how to detect timer settings on a Windows PC, to change them to improve performance, and to measure the performance using benchmarks.

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Here's how to install the new Media Player in the Windows 11 stable channel. Previous Post: « Windows 8. Comments Capprice said on April 18, at pm. So why are the cmd commands exactly the same? Robbie K said on April 18, at pm. Martin Brinkmann said on April 18, at pm.

The commands start with bcdedit. Keith Petersen said on April 18, at pm. Rene V said on April 18, at pm. Martin Brinkmann said on April 20, at am. Is this an intel only exercise? JohnMWhite said on April 19, at pm. As soon as I have tried I will post a response. Thanks for sharing the knowledge.