![]() So I have a feeling that we need to find whoever wrote this device driver and show them how to do threaded DPCs, and not to explicitly set an affinity on kernel threads, etc. I wonder why the dispatcher seems to be only scheduling the thread to run on that one seemingly arbitrary core. The challenge for King Charles, Goodale told the Star in an interview at Canada House, is how to reinvent monarchy in the 21st century. What bugs me (no pun intended) about this scenario though is that it appears as though whatever kernel thread that is doing this seems to be affinitized to that one core. And in the meantime, if it ain’t broke don’t fix it. If you find your CPU spending an inordinate amount of time on these interrupts, that usually indicates a faulty device driver that needs to be updated. I rolled off this weeks Windows 11 updates as the behavior just started but it does not appear to be helping This thread is locked. (ISRs) When an interrupt occurs, user mode work is suspended on that processor, and the CPU runs the ISR registered to that interrupt. Created on JanuWindows 11 CPU staying pegged at 100 All of a sudden my system is pegging at 100 CPU and stays pegged Cant find any rhyme or reason as to why its doing this. When a CPU is doing work in kernel mode, it's mostly running interrupt service routines. Xperf replaces the old Kernrate tool, and can net you some extremely detailed data. xperf -on PROC_THREAD+LOADER+DPC+INTERRUPTĪnd stop recording with xperf -d logfile.etl If you set up the symbol server, you should see the name of a function within a module (unless the module is non-Microsoft,) else you'll just see a numerical offset from the module's start address.Īlternatively, use Xperf from the Windows Performance Toolkit to profile interrupts, DPCs, etc. If it's NDIS.sys, for instance, that's a network interface driver. If you look at the module listed under Start Address, it should give you a clue as to what the work is related to. The thread that's causing all this kernel mode work should be here. ![]() Its the fastest, simplest, and most reliable way to use virtualized applications and desktops on your smartphone or tablet. The thread that's causing all this kernel mode work should be here. Parallels Client, when connected to the Parallels RAS, provides secure access to business applications, virtual desktops, and data. Right click the System 'process' and go to Properties. Right click the System "process" and go to Properties. Make sure you are running with full UAC elevation. Make sure you are running with full UAC elevation. If the process with the highest Privileged Processor Time is System, which I suspect it is, then it's a little more complicated. If that process is not "System," then you've just figured out what user mode process is causing this CPU usage. The process at the top of the list is the process currently using the most kernel mode CPU time right now. Sort-Object PrivilegedProcessorTime -Descending Running Powershell as administrator, type: Get-Process | Select Name, PrivilegedProcessorTime | ` As others have already pointed out, we can see from that screenshot that the CPU that's working so hard is spending all its time in kernel mode.
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