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Ongoing Pascal latency problems - Hotfix doesn't work for everyone. - Page 47

post #461 of 1679
Quote:
Originally Posted by Chaython View Post

WhUuWNX.png
Do I win highest latency?


R7 260x

You're actually fine, don't confuse the pagefault with DPC latency.

since you have an AMD card you are able to lower your DPC latency to 1-4us if you tried, 40us is still good with TSC or HPET off, the lower the better but as long as you stay below 100us at max loads at all times with no spikes going over 100us I wouldn't worry too much (You do have some spikes going over it momentarily), especially if you're not doing audio work or gaming on high refresh rates with low flip que sizes/Frame buffers.
Edited by Dargonplay - 7/19/16 at 12:00am
post #462 of 1679
Quote:
Originally Posted by Dargonplay View Post

Follow R0ach's and Cookieboyeli's guide to optimize your system, they go into a lot of details.
oh God no
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post #463 of 1679
Quote:
Originally Posted by Sele1981 View Post

I want to thank everybody for all the help. I have no more stuttering in VR. I am not sure if I have latency. Did not noticed anything but still it hovers around 500-1000us. I hope Nvidia can fix that.

Glad we could help

thumb.gif
post #464 of 1679
Quote:
Originally Posted by ChevChelios View Post

oh God no

I second this statement, that guide is pretty much garbage. So many of the BIOS/UEFI settings are board or vendor specific that you would have to make a guide for individual MB/GPU/mouse/KB combinations.
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post #465 of 1679
Thread Starter 
Quote:
Is DPC really an issue or more a Placebo?

it IS an issue.



Ultra smooth titan x benchmark

https://www.youtube.com/watch?v=-XCm-ZHA6S8




gtx 1080 stutter benchmark


https://www.youtube.com/watch?v=ygm4JqayXns



You can clearly 'feel' the micro stutters on 1080
post #466 of 1679
Quote:
Originally Posted by Farih View Post

But do you think spikes to 500+us is fine ?
Try a 24bit 96khz FLAC file, i reckon you get audio dropouts then.

Takes really major issues to cause audio dropouts while doing nothing but playing an audio file.

I can probably find or setup a system with persistent 5000+ microsecond DPC latency that won't produce a single dropout, crack, or pop while playing a 24-bit, 96kHz FLAC file...but which will have very obvious audio problems with increasing numbers of streams, especially with other loads going on.
Quote:
Originally Posted by Sele1981 View Post

By latency problems, I need very low latency times because I play racing simulations and need quick reaction times.

DPC execution times don't imply much about input latency.
Quote:
Originally Posted by JackCY View Post

Still Nvidia driver shows as the highest DPC, it's not bad absolute value but it still shows.

71 microseconds is an order of magnitude below the point where most anyone will be able to detect related issues in virtually anything.
Quote:
Originally Posted by Dargonplay View Post

HPET is a performance and latency hog if you're not running a bank of servers that need to have their timings synchronized.

TSC is another timer system ingrained in Windows and our BIOSes, it is in fact x100 times faster than HPET in certain scenarios (when multiple interrupts are being handled at the same time in chaos), it is a more "real time timer" that benefits the user but it would be catastrophic for servers (which is where HPET is king)

HPET should have no business in gaming PCs, because the only way to force your entire system to use the more efficient TSC is to disable HPET entirely.

HPET also affects the mouse movement feel. I'm not entirely sure why this happen but if I was to guess I'd say it is because of the "balanced" or "fixed" ratio of interrupts instead of the chaotic nature of TSC, HPET is the Vsync of system timers basically.

HPET's benefits are hardly limited to server clusters and most of HPET's problems are highly dependent on the quality of implementation. Overhead is much higher on HPET than TSC, but it's still going to be irrelevantly low on the majority of modern consumer systems.

The difference between useplatformclock true and false (or with the entry removed) on my more recent systems is so small that it's hard to measure when it comes to DPC/ISR time, or anything else for that matter. Only synthetic benchmarks that specifically poll the timers can reveal any clear difference.
Quote:
Originally Posted by Chaython View Post

Do I win highest latency?


R7 260x

Page fault resolution time is how long it takes something that wasn't found in memory to be retrieved from elsewhere. It has essentially nothing to do with DPC latency.
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post #467 of 1679
Quote:
Originally Posted by bugsixx View Post

it IS an issue.



Ultra smooth titan x benchmark

https://www.youtube.com/watch?v=-XCm-ZHA6S8




gtx 1080 stutter benchmark


https://www.youtube.com/watch?v=ygm4JqayXns



You can clearly 'feel' the micro stutters on 1080

If this is what micro stutter is then that is exactly what I have been experiencing in CSGO since two days after I removed the 290X and installed the GTX 1080. I have been going bat**** crazy trying to figure out why it was working perfectly initially upon installation then suddenly I began having that microstutter in CSGO. I was calling it frame hitching because I thought microstutter was a different more severe effect I had experienced before on Skyrim.
post #468 of 1679
Quote:
Originally Posted by xer0h0ur View Post

If this is what micro stutter is then that is exactly what I have been experiencing in CSGO since two days after I removed the 290X and installed the GTX 1080. I have been going bat**** crazy trying to figure out why it was working perfectly initially upon installation then suddenly I began having that microstutter in CSGO. I was calling it frame hitching because I thought microstutter was a different more severe effect I had experienced before on Skyrim.

Yes they come in as many names but usually all have very similar effect to the motion / frames

Un parking the cpu's can help with certain stutters did with me

http://www.coderbag.com/programming-c/disable-cpu-core-parking-utility

In metro 2003 and some other's i use to get stutters after un parking solved it

But these 10 series with this DPC is something else

suppose it all adds to the same problem with frames / motion
post #469 of 1679
What about this: http://www.lucashale.com/timer-resolution/ ?? does this fix the latency problem?
post #470 of 1679
Quote:
Originally Posted by harney View Post

Yes they come in as many names but usually all have very similar effect to the motion / frames

Un parking the cpu's can help with certain stutters did with me

http://www.coderbag.com/programming-c/disable-cpu-core-parking-utility

In metro 2003 and some other's i use to get stutters after un parking solved it

But these 10 series with this DPC is something else

suppose it all adds to the same problem with frames / motion

I am going to have to give some DPC latency guides a lookover tonight to see if there is anything I can do. My motherboard is super bare bones in terms of BIOS options so I can't do things like disabling HPET or C states in there. I disabled HPET in Windows though. Some things that I can do I simply won't. For instance I refuse to disable hyperthreading.
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