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High DPC Latency

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14 Dec 2013
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For some reason, I was playing League of Legends today, and I kept getting audio stutter, so I decided to check the DPC latency.

I used a tool to find out that the DPC Latency was incredibly high for dxgkrnl.sys which leads me to believe this is a driver problem?

Could Crossfire be causing this?

Vsync is off, because it being on causes painful stutters that i'm still waiting on AMD to fix.

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You not alone, I been having horrible latency issues lately.

Although am sure I have fixed mine, more testing needed.

But can you take out your 2nd GPU and reseat it.
 
I have crazy latency issues with vsync enabled, although disabling vsync isn't as good as disabling my 2nd monitor in CCC which completely resolves the problem and gives me perfect performance. I've been moaning about this for ages and I believe the driver team are looking into it, but maybe we need to moan some more.

If you have a second monitor try disabling it and see if that fixes your problem as a workaround.
 
what res you playing at to even need crossfire for LoL :o
I normally play this game in window mode
vsync still causes bad latency tho :(
 
Try this DPC latency checker. I think it gives a better visual representation of any latency.

http://www.thesycon.de/deu/latency_check.shtml

You will be able to see when and how often the problem happens. I had the same problem with audio stutter/crackle and eventually found that the motherboard chipset (Intel sata) drivers were the problem.

The stoport.sys in your pic suggests it is the harddrive (sata) drivers causing the issue. The gpu drivers are probably getting high latency because of the high delay caused by the storport.sys.
 
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Latencymon is the best out there. That program is so out of date it don't even work properly on Windows 8. Your also reading his results wrong the issue he as is directx, the Storport.sys has even past 0.2ms lag

My latency wasn't because of 2nd monitor or vsync because I don't use either.
 
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Latencymon is the best out there. That program is so out of date it don't even work properly on Windows 8. Your also reading his results wrong the issue he is directx, the Storport.sys has even past 0.2ms lag

My latency wasn't because of 2nd monitor or vsync because I don't use either.

I just mentioned it because of the vsync stutter he touched on, which is the main factor for high latency for me. I'm sure there's some issue causing this DPC lag behind it all, and maybe certain setups have different triggers, but there are definitely a lot of people having the multi-monitor + vsync issue that can be solved by disabling the monitor or at least vsync.
 
I just mentioned it because of the vsync stutter he touched on, which is the main factor for high latency for me. I'm sure there's some issue causing this DPC lag behind it all, and maybe certain setups have different triggers, but there are definitely a lot of people having the multi-monitor + vsync issue that can be solved by disabling the monitor or at least vsync.

Yeah... I about to test some more today, if I can play more than 30mins BF4 then mine is fixed.
But, DX kernel still spikes when in Crossfire, it just doesn't break the 1ms lag.
 
Yeah... I about to test some more today, if I can play more than 30mins BF4 then mine is fixed.
But, DX kernel still spikes when in Crossfire, it just doesn't break the 1ms lag.

Mine is almost always around the 15-16k mark, which is another reason I think this chap might have the same issue as me.
 
Well I may have to give that a go. I'd be surprised if that worked for me since my problem goes away when I disable my 2nd screen, but it's worth a shot right?
 
Well I may have to give that a go. I'd be surprised if that worked for me since my problem goes away when I disable my 2nd screen, but it's worth a shot right?

Yeah no harm in giving it a try mate.. I was shocked to see it fix mine tbh. It was my last thing I could only think off.
 
did you clean the gold contacts on gpu?maybe try it in another slot?

dpc can be caused by emi leakage from pcie slots aswell

tested with power saving/speedstep disabled? see if that stops it,also any motherboard monitoring/overclocking software,fully close it and test
 
No other free slots. The board was running 2 7950s in the same config so should be alright. Also, how do you explain everything working perfectly with the secondary screen disabled? You can even run eyefinity fine, but any non eyefinity monitors active will cause the issue. It has to be drivers.
 
something to do with the extra monitor then I would guess,either driver/display cable/power pack interference or poor amd driver support idk

idk how you would whittle it down to test either
 
Matt's aware of the problem. Supposedly it's under investigation. There is a thread on the AMD support forum from other people experience the exact same issue, and it can always be resolved by disabling any non-eyefinity secondary screens. So I'm 99.9% sure it isn't hardware related. I uninstalled Raptr ages ago, so don't think that's the problem either.

http://forums.amd.com/game/messageview.cfm?catid=475&threadid=177635&forumid=11

Do you have a secondary screen bloodkill? If so, could you disable it in CCC and see if that fixes your vsync issues and let us know?
 
I also don't think its Raptr, Before taking out my 2nd GPU. This windows was a fresh install never had Raptr installed and I still had the DX latency spikes.
 
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