Therefore to guarantee responsiveness of the system, ISR and DPC routines should execute as fast as possible. That is because ISRs and DPCs run at elevated IRQL which means they cannot become preempted by the thread dispatcher (scheduler). The DPC will most likely run immediately on the same processor which means the audio application will halt until both the ISR and the DPC routines have finished execution. The interrupt service routine (ISR) is executed and may schedule a DPC (Deferred Procedure Call) to offload an amount of work. Any thread that was running on the processor on which an interrupt occured will be temporarily halted regardless of its priority. An interrupt can occur on the same processor that an audio program is running on. Devices connected to the system may interrupt on a connected CPU and cause their interrupt service routines to execute. However the kernel also knows other types of units of execution known as interrupt service routines (ISRs). Threads with higher priority will be given a longer execution time (also known as quantum or time slice) than threads with a lower priority. The Windows thread dispatcher (also known as scheduler) which is part of the kernel executes threads based on a priority scheme. So I noticed you used LatencyMon and was going to test my own and came across this: Anand review claimed DPC of 108 for that board, but that was a previous BIOS version. I'm using a 3900x on a X470 Gaming 7 WiFi.
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