too high dpc latency on every version of windows :(

djseltus · May 1, 2016

hello
i have a crazy dpc latency problem
not cuz of cheapy realtek chipset (i use NI's session i/o for dac. it's latest driver is pretty old but it tested on other windows 10 pc)
average dpc latency 1000ms
too high pagefault
audio buffer, i/o fault
freezing while web browsing, youtube, almost every programe
low usable ram warning, even using less then 70% of ram
3d graphical glitch, frame drop, freezing, sometimes it just stop with wierd broken screen(you can see one like this when your vga have a cold solder joint or vram problem but my vga is just OKAY it tested on another pc and literally 'A OKAY' with high stress test and bench mark)
and it performs 30% low perthan same spec pcs (at bench mark sorce, 3d game fps, etc...)

cpu: fx8300
motherboard: asus m5a97 evo r2.0
gpu: msi twin frozer r9 270x -> 280
ram: ddr3 4g*4
sound: NI guitar rig seesion i/o, realtek hd sound chipset
power: 500w(old)650w(new)

i tried
-software part
1.disable every single 3rd party chipset(sata, usb3.0, etc...)
2.disable hpet and change timer resoultion
3.toggle or swipe every drivers that able to do with windows device manger and other programes
3.reinstall os(windows 7/8.1/10)
4.run chkdsk, sfc /scannow, dism /online /cleanup-image /restorehealth
5.disable every power consumption tweaks (such as c state, cool n' quiet, epu etc...)
6.i don't overclock at all (even i tried down clock and down voltage (for vga, cpu, ram))
7.using latest bios
8.using latest drivers
9.using the drivers that provided by mother board vendor

-hardware part
1.change cpu(used 5 cpu(965be,athlon,etc...))
2.use 2 different ram(Cruical and KLEVV(sk hynix's high class ram brand))
3.change vga(gts250, hd 7870, r9 270x, r9 280)
4.replace to 3 different hdd and 2 different ssd
5.connect only 1 storage
6.replace power(old one and new one both 80plus gold rated)
7.remove case to check electric short
8.add more fans to cool choke of motherboard
9.rma vga more than 5 times. it works perfect with other systems
10.local asus distributor support center tested and analyzed my motherboard and they said it's fine
11.but i doubt my motherboard(whatever its hardware or sowftware problem) so i contacted to asus few times but they F(word)ing didn't give me any SH*T:banghead:

p.s. i have this problem since i assembled this computer

p.s.2 sorry about my bad english and appricate your help

p.s.3 i have serval logs that checked dpc latency. i uploaded to google drive but it's over than 1gb so i didn't attach that link yet
if needed i'll upload it

djseltus · May 1, 2016

lowest dpc lantecy that i can reach is 300~500 when disable hpet, change system timer resloution to 0.56ms, tweak many other things but system is tooooo unstable

djseltus · May 1, 2016

and high latency driver is usbport.sys, dxgkrnl.sys, rsplll64.sys, storport.sys, etc...(almost system dependence thingys)

OldGrayGary · May 1, 2016

Hi djseltus ... and welcome to the forums ...

Sorry for the late reply ... getting older & slower by the minute!

A few quick-fix tries:
1) Make sure Driver Verifier is off.
If you used Driver Verifier during your troubleshooting, make sure to turn it off if you've finished testing with it.
.....Right-click the Windows 10 Start Menu
.....Select Command Prompt (Admin)
.....Reply Yes to "Do you want to allow this app to make changes to your computer?"
.....At the prompt, type VERIFIER /RESET
.....Restart your computer.
2) Test the audio with Latency Monitor not running at all (if it is set to run a startup, try things with it not running). Latency monitor is itself a source of high latency ... also make sure that when you test with Latency Monitor, it is with the latest version (6.50) - which was updated for Windows 10.
3) The high usbport.sys error usually points to the drivers for gaming/music-instruments devices: keyboards, mice, and audio USB devices. Fussing with different versions can sometimes help. If the latest drivers don't help, sometimes the older drivers provide some relief.
4) If you don't need to have Internet access while using the audio equipment, test things with your LAN and WAN adapters temporarily disabled (& reboot, just to be thorough)... Some Internet/networking drivers have been shown to create high latencies.
5) If you have a third-party firewall installed, see if you can turn off it's "blocking of port-scanning" feature (the language that describes this feature can vary quite a bit)... a forum visitor here found that disabling that feature in their Bitdefender firewall fixed a latency issue. It evidently can happen with other firewalls as well. If you modem/router/gateway device has built-in port-scan blocking, you shouldn't suffer any drop in your protection.
6) Check on the background service usage for Superfetch, Windows Search, & Indexing. (Indexing you can alter using the "Indexing Options" item in Control Panel. Search & Superfetch can be altered using Windows Administrative Tools applet "Services").
7) Pray for mercy from the hardware driver authors.

If you do find a cure, let us know -- since so many folks are suffering from these same issues.

djseltus · May 2, 2016

thanks for answer!

1.i forgot to say that but tried already

it says there is no change and nothing happened

2.already tried no difference
my audio interface's(ni seesion i/o)(that use for audio i/o device) driver has its own asio buffer latency monitor
it has just same result with dpc latency monitor
3.already tried too, i pulled out every deivce excpet dvi cable and nothing changed

4."3.toggle or swipe every drivers that able to do with windows device manger and other programes" also tried
p.s. and i also tried disable Ethernet driver and use wifi module. just the same
5.i use avira or webroot one but i tried already as well....
6.oh...i didn't know that functions casue latency.... i'll try it!
p.s. i just tried it but nothing changed

7.okay :/

OldGrayGary · May 3, 2016

Just to see: let's try catching the culprit in action ...

Download the tiny but effective Microsoft/SysInternals tool "Process Explorer". It doesn't need to be installed, you can just create a shortcut to it & use that to run it when you wish. (you do have to "unzip" the download though, since it arrives "zipped"). You can find Process Explorer at the link below:
Process Explorer

At a time when you are experiencing the stuttering/latency issues, start up Process Explorer & see if you can spot the process having sharp enough spikes in resource usage to cause the problem.

There's another tool also available from Microsoft/SysInternals, called "Process Monitor" .... that might also be of help. Unfortunately, I haven't used that particular tool myself [never quite enough free time to explore it] ... but it might also be a way of detecting the source of audio/video snags.
Process Monitor

I'll stay tuned....

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too high dpc latency on every version of windows :(

djseltus

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djseltus

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djseltus

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OldGrayGary

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djseltus

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OldGrayGary

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