Mornel

No more ideas? :-(

Yeah, it also happens without the USB web cam (it's integrated in the notebook but I tried disabling it in the device manager). The Intel Chipset drivers are up-to-date (but they don't seem to include USB drivers anyway). Maybe I should try disabling all the USB Host Controllers in the Device Manager and see if that helps? Also, what's more important when looking at the DPC CPU Usage Summary Table? The "Max Actual Duration" or the the "Actual Duration"? Without the 90ms dpc calls I don't seem to get noticeable sound interruptions anymore but I'd still like to fix this problem completely...

Thanks for your advice! I've tried upgrading Alcohol but it did not really help... so now I've uninstalled it and the sptd driver completely. Didn't use it that often anyway. OpenVPN and VirtualBox already are the newest versions. I've also upgraded the nvidia driver just to be sure. However, my problem is still not solved. Looking at DPC Latency Checker I still get spikes up to 19ms and an overall bad performance in the area of 2ms (it was mostly below 0.4ms last time with sptd and all network adapters disabled). And now the trace seems to show that usbport.sys is the new villain and enabling/disabling the network adapters does not seem to make any difference anymore... well, I've uploaded the new trace here: [edit: link removed]

Hello André, I've uploaded all the trace files, both with sptd enabled and disabled and with network enabled and disabled (4 files altogether). Here is the link: [edit: link removed] Thanks a lot for your time!

Hello! MagicAndre1981, it's really cool that you are helping people here :-) I've started getting problems with high DPC Latencies lately - when I listen to music my sound gets interrupted about every 30 seconds and that sucks really hard. I've followed all the instructions here and I've also googled a bit and tried some other things. So here are my findings: I've got Alcohol 120 % installed and when the sptd.sys driver (which is installed with Alcohol 120 % and also with Daemon Tools) is loaded, the Windows Performance Tools kit shows an "Unknown" module which makes lots of DPCs. But when I disable the sptd.sys driver via these instructions I get other results - and it seems that the issue is related to my network adapters. If you look at the screenshots, you'll see that tcpip.sys makes a peak DPC of 90ms. I've got LAN, WLAN, two virtual adapters installed by OpenVPN and one virtual adapter installed by VirtualBox. I've updated both the WLAN and the LAN drivers to the latest version. When I disable sptd and all of the network adapters, the problem is solved. Even with sptd enabled and all of the network adapters disabled there seem to be no problems. However, I'd like to be able to surf the net and listen to music simultaneously... It would be great if you could look into this. I'll only attach the screenshots at first but I can also upload the .etl files if you need them. Here is the version with sptd disabled and all network adapters enabled: And here is the version with sptd disabled and all network adapters disabled: PS. I've also made logs with sptd enabled but these seem to be more helpful.