HPET in XP ? yes, no, maybe ? :D

[leeperry]

so I got HPET enabled in my Gigabyte P31 mobo BIOS, and I run XP SP3.

it uses IRQ 0 & 8 in the device manager.

a friend of mine with pretty much the same mobo(giga P35) on XP SP2 doesn't have them.

he's got "system clock" on 0 and "CMOS realtime system clock" on 8.

so is m$ lying when they say that there's no HPET drivers for XP ?

I haven't found a way to check whether HPET was actually functional in XP

[James]

Originally Posted by leeperry

so I got HPET enabled in my Gigabyte P31 mobo BIOS, and I run XP SP3.

it uses IRQ 0 & 8 in the device manager.

a friend of mine with pretty much the same mobo(giga P35) on XP SP2 doesn't have them.

he's got "system clock" on 0 and "CMOS realtime system clock" on 8.

so is m$ lying when they say that there's no HPET drivers for XP ?

I haven't found a way to check whether HPET was actually functional in XP

You can check the clock frequencies in ReClock's logfile.

[leeperry]

well it says :

    0.61s 000890         Getting reg key Wait = 154320.960000
    0.61s 000890         Getting reg key WaitFactor = 2.572016
    0.61s 000890         Getting reg key Freq = 3579535.500000
    0.61s 000890         Getting reg key Ti = -1.369129
    0.61s 000890         Getting reg key BaseFreq = 3579545

anyway it's clearly the timing source on my box...except if it runs in legacy mode ?

apparently you can check if HPET is active by using QueryPerformanceCounter/QueryPerformanceFrequency :
http://support.microsoft.com/default...;en-us;Q172338

http://www.eggheadcafe.com/articles/20021111.asp

this might be interesting for Reclock maybe ?
http://www.codeguru.com/cpp/w-p/syst...icle.php/c5759

[James]

Originally Posted by leeperry

well it says :

    0.61s 000890         Getting reg key Wait = 154320.960000
    0.61s 000890         Getting reg key WaitFactor = 2.572016
    0.61s 000890         Getting reg key Freq = 3579535.500000
    0.61s 000890         Getting reg key Ti = -1.369129
    0.61s 000890         Getting reg key BaseFreq = 3579545

anyway it's clearly the timing source on my box...except if it runs in legacy mode ?

apparently you can check if HPET is active by using QueryPerformanceCounter/QueryPerformanceFrequency :
http://support.microsoft.com/default...;en-us;Q172338

http://www.eggheadcafe.com/articles/20021111.asp

this might be interesting for Reclock maybe ?
http://www.codeguru.com/cpp/w-p/syst...icle.php/c5759

No, I mean this:

    0.01s 00075c         Raw speed = 3579545 Hz
    0.01s 00075c         Used speed = 3579545 Hz

Above example is from PMTimer on XP.
"Raw Speed" is the value returned by QueryPerformanceFrequency.
ReClock's BaseFreq can be different (Used speed).

It is either 1.5MHz (PIT, Win2000), 3,5MHz (PMTimer), CPU Clock ( ) or HPT frequency (I believe around 15MHz)

[leeperry]

xp sp3 /NOEXECUTE=ALWAYSOFF /FASTDETECT /USEPMTIMER /NODEBUG /TIMERES=9766

0.00s 000890 Raw speed = 3579545 Hz
0.00s 000890 Used speed = 3579545 Hz

xp sp3 /NOEXECUTE=ALWAYSOFF /FASTDETECT /NODEBUG /TIMERES=9766

0.00s 000168 Raw speed = 3735070000 Hz
0.00s 000168 Used speed = 3647529 Hz

vista sp1

0.08s 0006ec Raw speed = 14318180 Hz
0.08s 0006ec Used speed = 3579545 Hz

you nailed it, thanks James

[ashlar]

Meaning? From the above you have working HPET under XP SP3 or not?

Help us mere mortals

[leeperry]

well the "raw speed" on Vista is indeed 15MHz(HPET?), but the "Used speed" is the same as the PMTimer in XP....not sure why, maybe James knows ?

OTOH, even though I got 2 IRQ entries that say "HPET" on XP, the raw speed is not 15MHz

[James]

Originally Posted by leeperry

well the "raw speed" on Vista is indeed 15MHz(HPET?), but the "Used speed" is the same as the PMTimer in XP....not sure why, maybe James knows ?

Sure. ReClock divides the frequency by 4, which happens to be 3579545.

[ashlar]

Originally Posted by James

Sure. ReClock divides the frequency by 4, which happens to be 3579545.

And what do you make of his XP SP3 w/HPET results?

[leeperry]

Originally Posted by ashlar

And what do you make of his XP SP3 w/HPET results?

what results ?

anyway I don't recall ever having 2 HPET entries in the IRQ list..

and lately HR has been working amazingly well w/ the new betas + yesgrey's resampler on my box(starts at -8ms jitter and end up at -3ms 90' later on 23.976 MKV...great stuff!), so I thought it was sorta related

and to add more infos to the drifting jitter in HR(ÿaÿ ), Kazuya just told me that it also drifts with 23.976 xvid .AVI....but it doesn't happen with .TS or .VOB(this jitter renders VMR/HR/EVR unstable on XP)

so this is not a MKV-only problem....and might very well be a Reclock issue...or Directshow