Hi, I noticed a problem with constant high CPU usage on one of my cores. As much as 60% was used. The problem occures after I put the system to "sleep" (S3 state) and perform a WOL with a "magic packet". I discovered that ACPI.sys+0x1af44 thread was responsible (using sysinternals ProcessExplorer) under the System process. If i perform WOL while the machine was shut down everything works perfectly. My NIC is "Realtek PCIe GBE Family Controller" and I'm using the latest drivers. I discovered that if I disabled the option in Power Management for the device: "Allow this device to wake the computer", the CPU usage immediately went to normal (without restarting). But enabling it back the high CPU usage resumes. Performing another sleep and awaking the system with power button "resets" the CPU usage issue for "good". Until i WOL from sleep again ofcourse.. I contacted the motherboard manufacturer of the problem but so far no real answer. I'm saddened because I need the WOL feature. I'm hoping somebody who has more insight in the behaviour of ACPI on W7 can answer my questions. Regards Specs: ------------------------------------------------------------------------------- Model Name : GA-X58A-UD7(rev. 2.0) -------------------------- M/B Rev : 2.0 BIOS Ver : FC Serial No. : Purchase Dealer : ------------------------------------------------------------------------------- VGA Brand : Nvidia Model : 7950GT CPU Brand : Intel Model : i7 950 Speed : 3.06GHz Operation System : Win 7 64-bit SP : Memory Brand : Corsair Type : DDR3 Memory Size : 6GB Speed : 1600MHz Power Supply : 450 W

Hi, please make a xperf trace [1] to diagnostic the high CPU usage after doing WOL. Please upload the etl file to your SkyDrive [2] and post a link here. I'll take a look at it, maybe I can see more details. André [1] http://www.msfn.org/board/index.php?showtopic=140264 [2] http://social.technet.microsoft.com/Forums/en-US/w7itproui/thread/4fc10639-02db-4665-993a-08d865088d65"A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/

Here's the etl file: http://pub.insanity.in/razno/acpi_wol.etl You can clearly see when I disabled the "Allow this device to wake the computer" option DPC activity goes to 0. And it's almost always on Core 3...