April 15, 2019

LINUX HPET DRIVER DOWNLOAD

Since the original specification for HPET in calls for a high resolution counter, which is then exposed by the QueryPerformanceFrequency and QueryPerformanceCounter API calls already available since Windows , it is the QueryPerformanceFrequency that can shed light on how this “high precision” counter is actually being provided. Newer operating systems tend to be able to use either. Sign up using Email and Password. 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. So the HPET is only there to satisfy the system’s high speed needs. A benchmark in that environment for 10 million event counts found that TSC took about 0. Please help improve this article by adding citations to reliable sources.

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High Precision Event Timer

The difficulties are exacerbated if the comparator value is not synchronized with the timer immediately, but lihux by one or two ticks, as some chipsets do. In one-shot mode the comparator fires an interrupt once when the main counter reaches the value stored in the comparator’s register, while in the periodic mode the interrupts are generated at specified intervals.

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This causes an interrupt at every millisecond even if the application needs to do actual work less frequently. Work around hardware stupidity Archived at Archive. From Wikipedia, the free encyclopedia. February Learn how and when to remove this template message. Some hardware has both. Email Required, but never shown. 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 scheduling.

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Will the computer have better entropy with HPET? Compared to these older timer circuits, the HPET has higher frequency and wider bit counters although they can be driven in bit mode. Performance is not a problem, I would like a good entropy, and cryptographically secure random numbers. Besides mentioning the race condition discussed above, a VMware document also lists some other drawbacks: Each comparator can generate an interrupt when the least significant bits are equal to the corresponding bits of the bit main counter value.

A popular value is By using our site, you acknowledge that linhx have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Sign up or log in Sign up using Google. It can also be a nuisance that the ever-increasing processor speeds of newer processor designs make this usable time span shorter still.

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cryptography – HPET effects on CSPRNG for Linux OS – Information Security Stack Exchange

Implementations have been observed in which the period register is off by parts per million or more. Comparators can be driven by the operating system, e. A benchmark in that environment for 10 million event counts found that TSC took about 0. Since the original specification for HPET in calls for a high resolution counter, which is then exposed by the QueryPerformanceFrequency and QueryPerformanceCounter API calls already available since Hptit is the QueryPerformanceFrequency that can shed light on how this “high precision” counter is actually being provided.

The comparators can be put into one-shot mode or periodic mode, with at least one comparator supporting periodic hpey and all of them supporting one-shot mode. This article needs additional citations for verification. By clicking “Post Your Answer”, you libux that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Formerly referred to by Intel as linuc Multimedia Timer[1] the term HPET was selected to avoid confusion with the multimedia timers as a software feature introduced in the MultiMedia Extensions to Windows 3.

HPET is meant to supplement and replace the programmable interval timer and the RTC’s periodic interrupt function.