![]() ![]() Addressed issue where SDK setup failed to install on Windows.Addressed issue where MidlRT and MDMerge failed to run on Windows 7.Addressed issue where developers could not build UWP apps on Windows 7 because MRMSupport.dll failed to load.Released in conjunction with the Windows 10 Anniversary Edition (version 1607). Windows 10 SDK (3.795) and Microsoft Emulator for Windows 10 mobile (3.0) Addressed issue where UWP Remote Deployment Pipeline silently swallows SMB exceptions.Addressed issue where WinAppDeploycmd tool fails to connect to phone via USB.Back ported tests to App Certification Kit.Addressed issue where build errors were encountered when including events.h.Released in conjunction with the Windows 10 Creators Update (version 1703). Windows 10 SDK (3.468) and Microsoft Emulator for Windows 10 mobile (4.1) Released in conjunction with the Windows 10 Fall Creators Update (version 1709). Windows 10 SDK (9.91) and Microsoft Emulator for Windows 10 mobile (4.1) Released in conjunction with the Windows 10 April Update (version 1803). Addressed issue where deriving from SelectorAutomationPeer in IDL raises MIDL error "Unsupported array pattern detected.".Addressed issue where UWP projects that used multiple MinTargetPlatformVersions would fail with a build error related to XAML.Addressed issue where Windows App Certification Kit failed to deploy MSIX bundle.Addressed issue where Windows App Certification Kits crashes for any app that declares more than one Device Family in manifest.Released in conjunction with Windows 10, version 1809. Released in conjunction with Windows 10, version 1903. Resolved issue that caused WACK to fail with “Task failed to enable HighVersionLie”.Resolved issue that prevented AppVerifier from working.Resolved unpredictable and hard to diagnose crashes when linking both umbrella libraries and native OS libraries (for example, onecoreuap.lib and kernel32.lib).Released in conjunction with Windows 10, version 2004. For desktop development, see the release notes for changes you may benefit from by updating. Primarily intended for Windows Server development. Critical updates for developers building Arm64EC applications.Includes servicing update 0.832 on July 29, 2022: Includes ARM64 support for the Visual Studio 17.4 release.Includes servicing update 0.755 on October 25, 2022: 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.Released as part of Windows 11, version 22H2. I wonder why the dispatcher seems to be only scheduling the thread to run on that one seemingly arbitrary core. 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. 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. (ISRs) When an interrupt occurs, user mode work is suspended on that processor, and the CPU runs the ISR registered to that interrupt. 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. Right click the System "process" and go to Properties. 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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