Vista hpet

I tried the new build, and the behavior still repros. Hmm, then there must be another bug in the HPET timer implementation. VBoxManage claims that it's off, but the timer frequency is the same MHz , and it still periodically skips forward 2 32 ticks.

I looked at the change in SVN, and it appears to address the possibility of sampling the two bit halves during a roll-over. However, my issue cannot be caused by a race condition. If it were a race, then only time samples around the roll-over would be corrupt, and the timer would otherwise tick at the normal rate. I am seeing it tick at twice the normal rate. It appears that the high half is incremented twice every time the low half rolls over.

I can only think of two scenarios: 1 Windows is counting interrupts, and somehow the interrupt gets delivered twice. Interrupts at Mhz rate would kill any modern box, so I somewhat doubt that Windows counts interrupts for performance counters, at least directly. Good news, however, is that I'm able to reproduce your issue. Rewrote your test a bit, and see that jump is 4x of normal on my box, and usually happens once or twice during a minute.

Issue looks rather interesting, so stay tuned. Hopefully fixed in SVN testcase works fine. Could you please test trunk build and see if it resolves issue for you too. Maybe and this ticket are related to each other? Unlike , I am not experiencing stalls. The application that I am developing is seeing huge leaps in the HPET time, but apart from that I have not observed any adverse effects.

Please try again now. The current code still has some issues but it would be interesting to get some feedback anyway. I have not had a chance to set up the build environment to build from SVN; is there a build that I can download? Should I just keep it on and learn how to play with high input lag? Im lost and would really appreciate your help. Last edited: Feb 16, Tin , Feb 16, On modern CPUs post Vista-era an internal tick clock is used.

HPET is used for high precision timers on devices to talk with south bridge. On even older CPUs with fixed clock the internal tick is also used. Alessio , Feb 17, Smough likes this. Tin , Feb 17, No, you don't need. Leave the SB chipset use it when it needs.

Alessio , Feb 20, Tin likes this. SatsuiNoHado likes this. I don't know what to think about HPET. We are close to several shopping centers and dining options. We look forward to meeting you and your family. Visit us today! Our first concern is that you, your family, and your pet s are remaining healthy and safe.. At this time, we are not changing our hours of operation or our commitment to our clients and patients.

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