[How to get the cause of high CPU usage by DPC / Interrupt]

You don't have any DPC or interrupt issues! Both use less than 1% of CPU. You only have CPU usage spikes caused by Everest Ultimate.

ok then ! my mistake was to believe i needed to be in the 40 µs range under windows 7.

Thanks for your expertise and kindness André, you are a true blessing for all of us !

[How to get the cause of high CPU usage by DPC / Interrupt]

here it is

[How to get the cause of high CPU usage by DPC / Interrupt]

@ilove2learn

sort for duration, not the count! Which DPCs take most time?

As i tried to update my PC since previous post, i did a new xperf. Here is it's summary table :

[How to get the cause of high CPU usage by DPC / Interrupt]

Hello MagicAndre & friends,

I join this thread hoping you can help me improve my DPC latency. Back in XP SP3, DPC latency used to stick around 40-50 µs. Within win7 64, I don't have huge red spikes often, but yellow ones (1070 µs for example) happen quite easily, and overall my latency is in the 300-400 µs range, which feels too much and uncomfortable : this is supposed to be a fully functionnal DAW for me to earn a living with it.

Xperf shows an unknown module and it's function 0xfffffa8002fb20f0 which i suspect is reponsible for the situation. Please find with this post

a .txt summary of my PC

http://www.zshare.net/download/76065675ce27aac1/

a screen shot of DPC latency checker

a screen shot of xperf's Summary table

http://www.zshare.net/download/76065675ce27aac1/

Best Regards.