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Zen2 and HPET. My findings.

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post #11 of 25 (permalink) Old 08-10-2019, 11:00 AM - Thread Starter
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So I tried. Made no change in DPC latency in my system. I even tried all off and all on without any noticeable change.

I didn't reboot after setting them, am I supposed to do so?

What about the "limit" section in that program?

PC Specs: 3900X - X470 Taichi - 64GB 3000Mhz DDR4 - 1080ti waterforce xtreme - H115i Pro with 4 fans + Liquid Metal.
Per CCX OC Settings: 4.5/4.4/4.35/4.35 at 1.32V (1.26Vdroop) Max AIDA64 temp 75c at Turbo AIO settings / 83c at Balanced AIO settings.

Last edited by SaccoSVD; 08-10-2019 at 11:06 AM.
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post #12 of 25 (permalink) Old 08-10-2019, 11:12 AM
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Quote: Originally Posted by SaccoSVD View Post
So I tried. Made no change in DPC latency in my system. I even tried all off and all on without any noticeable change.

I didn't reboot after settings them, am I supposed to do so?

What about the "limit" section in that program?

You have to reboot. The changes to MSI only get applied at boot.

In an earlier post you asked what to look out for:

On my old Ivy Bridge system, I must be careful with the AHCI controller. If I enable MSI for the AHCI controller, Windows will not boot anymore. Because of this, it's important to enable the "System Restore" feature of Windows and create a "restore point" before you start your experiments. You can then access that restore point in the advanced boot menu of Windows that you can get to by holding down the F8 key at boot.

In theory, the correct way to do the tweaks is to go one by one through the devices and reboot after every change, so that you are testing only one change at a time.
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post #13 of 25 (permalink) Old 08-10-2019, 11:24 AM - Thread Starter
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Here most of the things I would suspect to cause a DPC latency problem are on MSI.

I tried a couple more times and after rebooting there was no improvement.

The DPC latency peaks were caused more from the windows kernel than anything else.

Awful peaks about 1 or 2s after starting to monitor with LatencyMon.

So, it seems to be a problem in windows and I need to wait for an update. Until then HPET will stay off in this machine.

It was off for the last two years since I got my 1800X (it was advisable to disable HPET) and I never had any issue with any application. And I do have tons of them, literally tons since this is a workstation.

PC Specs: 3900X - X470 Taichi - 64GB 3000Mhz DDR4 - 1080ti waterforce xtreme - H115i Pro with 4 fans + Liquid Metal.
Per CCX OC Settings: 4.5/4.4/4.35/4.35 at 1.32V (1.26Vdroop) Max AIDA64 temp 75c at Turbo AIO settings / 83c at Balanced AIO settings.
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post #14 of 25 (permalink) Old 08-11-2019, 01:37 AM
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Guys here is the link enjoy http://www.mediafire.com/file/2kkkvk...SI_util_v2.zip It is my belief Ryzen processors will actually benefit greatly from this change. Encourage testing for this is really big as Ryzen has ample performance. This thread might get large from findings or results and relative user experience. My first processor designed by Jim Keller like Ryzen it was AMD Athlon 64 3500+ @ 2.2Ghz. Ocd to 2.563ghz with HYPERTRANSPORT Oc and slower RAM to allow for scaling.

Last edited by BlownGUNSLINGER; 08-11-2019 at 01:49 AM.
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post #15 of 25 (permalink) Old 08-11-2019, 03:03 AM
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Quote: Originally Posted by BlownGUNSLINGER View Post
Guys here is the link enjoy http://www.mediafire.com/file/2kkkvk...SI_util_v2.zip It is my belief Ryzen processors will actually benefit greatly from this change. Encourage testing for this is really big as Ryzen has ample performance. This thread might get large from findings or results and relative user experience. My first processor designed by Jim Keller like Ryzen it was AMD Athlon 64 3500+ @ 2.2Ghz. Ocd to 2.563ghz with HYPERTRANSPORT Oc and slower RAM to allow for scaling.
Hey there, sorry for my ignorance. I noticed I had to run it as administrator otherwise it is prevented from accessing the registry. Here comes the ignorant part, what do I need to do with this app. I noticed it showing which item uses MSI, and from mine it seems everything except for Sound and Graphics. What is the purpose of this app?
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post #16 of 25 (permalink) Old 08-11-2019, 09:28 AM
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Quote: Originally Posted by VPII View Post
What is the purpose of this app?
To easily set devices like these
Quote: Originally Posted by VPII View Post
Sound and Graphics.
that may benefit from MSI mode.

= Ryzen 7 3700X 4.3GHz @ 1.3v / Thermalright TS140 BW / Prime X470-Pro / 16GB Crucial BSLT 3600 MT/s cl16 / 1080Ti Amp Extreme 2GHz @ 0.987v / Aerocool Project7 P650 / Fractal Define XL =
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post #17 of 25 (permalink) Old 08-11-2019, 09:47 AM
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Here's a quick look at my DPC Latency - got 2 windows of Firefox open, one is playing you tube video while I do the test. HPET=On
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Ryzen 9 3900X | Current Bios - 2606 | Crosshair VII Hero | 16GB Patriot Steel 4400CL19 @ 3733CL14 | ADATA SX8200NP 480GB | Fractal Design S36 AIO

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post #18 of 25 (permalink) Old 08-11-2019, 10:04 AM - Thread Starter
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Quote: Originally Posted by upgraditus View Post
To easily set devices like these that may benefit from MSI mode.
Mine doesn't look like in the picture, doesn't show "Supported modes" or "Interrupt priority". How do I get it to display that?

Did you have to change any of those to get good latency? (your latency is freaking stellar)

Maybe Zen2 is just very different.

Can you share a pic from your settings pls?

PC Specs: 3900X - X470 Taichi - 64GB 3000Mhz DDR4 - 1080ti waterforce xtreme - H115i Pro with 4 fans + Liquid Metal.
Per CCX OC Settings: 4.5/4.4/4.35/4.35 at 1.32V (1.26Vdroop) Max AIDA64 temp 75c at Turbo AIO settings / 83c at Balanced AIO settings.

Last edited by SaccoSVD; 08-11-2019 at 10:08 AM.
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post #19 of 25 (permalink) Old 08-12-2019, 02:48 AM
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To whoever is going to ask "do proper benchmark" or stuff like that: you can't benchmark such thing. Just load a freaking game and feel the microstutter difference... AC origins and AC odyssey for example heavy suffer from this, try hpet OFF bios + useplatformclock /false, microstutters are gone

P.S as for the MSI utility... put all AHCI, NVM or whatever drive controller to "Undefined" or "Normal" then put USB controllers to "High". Thank me later for the decreased input lag ^^. I also put GPU on High priority but i dont really know if it makes a difference.
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post #20 of 25 (permalink) Old 08-12-2019, 03:45 AM
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Can't you just disable it in the device manager?

Ryzen 9 3900X | Current Bios - 2606 | Crosshair VII Hero | 16GB Patriot Steel 4400CL19 @ 3733CL14 | ADATA SX8200NP 480GB | Fractal Design S36 AIO

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