This page was last edited on 24 September , at This causes an interrupt at every millisecond even if the application needs to do actual work less frequently. Post as a guest Name. The difficulties are exacerbated if the comparator value is not synchronized with the timer immediately, but delayed by one or two ticks, as some chipsets do. Compared to these older timer circuits, the HPET has higher frequency and wider bit counters although they can be driven in bit mode. This section needs expansion with:
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HPET is a continuously running timer that counts upward, not a one-shot device that counts down to zero, causes one interrupt and then stops. Work around hardware stupidity Archived at Archive.
A popular value is February Learn how and when to remove this template message. Only on certain hpdt processor architectures such as ARC will you have problems involving the lack of a high-resolution TSC instruction.
Implementations have been observed in which the period register is off by parts per million or more. Will the computer have better entropy with HPET?
High Precision Event Timer – Wikipedia
Views Read Edit View history. Comparators can be driven by the operating system, e.
This causes an interrupt at every millisecond even if the application needs to do actual work less frequently. So the HPET is only there to satisfy the system’s high speed needs. From Wikipedia, the free encyclopedia.
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While and RTC can be put into an HPET-like one-shot mode, the set-up process is so slow that their one-shot mode is not used in practice for tasks requiring precise llinux. Is it better to enable HPET or leave it disabled.
Some hardware has both.
Performance is not a problem, I would like a good entropy, and cryptographically secure linx numbers. A benchmark in that environment for 10 million event counts found that TSC took about 0.
Home Questions Tags Users Unanswered. This has hpeet express advantage of being independent of the CPU frequency and still provides a very reasonable sub-microsecond resolution and accuracy.
Webarchive template archiveis links Articles needing additional references from February All articles needing additional references Articles to be expanded from February All articles to be expanded Articles using small message boxes All articles with unsourced statements Articles with hpeh statements from December Each comparator can generate an interrupt when the least significant bits are equal to the corresponding bits of the bit main counter value.
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It was developed jointly by Intel and Microsoft and has been incorporated in PC chipsets since circa Formerly referred to by Intel as a Multimedia Timer the term HPET was selected to avoid confusion with the multimedia timers as a software feature introduced in the MultiMedia Extensions to Windows 3.
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