Originally Posted by CryWin
Is anyone getting CPU usage on one thread all the time for no reason? I'm getting about 40% usage on one thread all the time. Which is still low for the overall CPU usage, but annoying.
Under processes it appears to be coming from system interrupts but that doesn't tell me anything.
Have a look at the process list and see if "system interrupts" is using a high amount of CPU at idle (should be less than 1%). Using the application LatencyMon can help you track down what is causing the system interrupts to be running at high levels. It can often be wifi adapters or ACPI.
I am running windows on a macbook pro and on a fresh boot, my system interrupts will pulling high loads on core 0 and run it at 100%. It turns out that it is something up with the apple bootcamp drivers and ACPI that is causing it to behave that way. If I sleep the PC and then wake it up again, The ACPI drivers sort themselves out and the CPU usage goes back to the 2-3% that you would normally expect. There may be a permanent way to resolve the acpi problem but I have not spend too much time looking for it as the "sleep" solution hasnt really started motivating me to go searching.
You may be able to solve a wifi system interrupts problem by enabling Message signaled interrupts on the wifi adapter. If you are using a USB adapter, try it in different ports, either CPU connected or chipset connected