Hello,

using Windows 8 on a HP z420 with GTX680 GFX. One Core of my Machine is constantly 100% in use by interrupts.

With the help of Windows Performance Analyser I was able to identify which Process filles up one of my CPU Cores with 100% of interrupt handling.
It's the ACPI.sys - but now I don't know how to investigate further and find our why ACPI.sys is eating up one Core of my System ...

Maybe someone here can help me on this? (And what Information do you need for helping me out here?)

Thank you, bye from snowy Austria
Andreas Schnederle-Wagner

Hi,

first let me say thanks you take your time to help me! ;-)
Uploaded the ETL here: www.partynet.at/files/DPC_Interrupt.zip

Andreas

Looks like ACPI.sys!OSNotifyDeviceWake is the cause. Disable powersaving for the devices in device manag

I can see which device is the issue. Try it with your LAN/WLAN, HDD maybe this h

Seems like you are perfectly right!

Just unplugged both Barracudas - and CPU usage while idle dropped to zero ... :)

This means the Intel Matrix Storage Manager is the cause of this problem?!? (unfortunately i have already installed the latest Version)

weird - after I plugged the HDDs in again and fired up the PC the Problem is gone - without any driver Change?!?

Does this make sense??

Andreas

really weird ... hehe ... hope it stays like this now! ;-)

Thank you very much for your help!!!

Andreas

Thank you very much for your help!!!

I have the exact same issue....BUT....now its the opposite.

Before, I noticed that 1 cpu core was active when a disc was in the optical drive of my Samsung Series 7 laptop...when i removed the disc...cpu usage was gone....

I just re-installed win 8, fresh and clean...newest drivers and such...and now its the opposite!!  The ACPI.sys hogs core 1 when no disc is inserted, but as soon as I put one in...cpu usage is gone....what is going on here?  

run 2 xperf tarces (1 where you have the issue and 1 when not).

Install the WPT (http://social.technet.microsoft.com/wiki/contents/articles/4847.install-the-windows-performance-toolkit-wpt-en-us.aspx), open a CMD prompt with admin rights and type this:

xperf -on latency -stackwalk profile -buffersize 1024 -MaxFile 256 -FileMode Circular && timeout -1 && xperf -d HighCPUUsage.etl

after you captured 30s of the high CPU, go back to CMD prompt and press a key to stop the logging. Now compress the HighCPUUSage.etl as 7z (LZMA2, ULTRA) to reduce the size.

Run it the second time when the issue is gone and replace HighCPUUsage.etl with a different name.

Upload the files to your SkyDrive or Dropbox and post a link here.