Questions tagged [interrupts]
The interrupts tag has no usage guidance.
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High "System interrupt" CPU % in Windows 10 Task manager, linked to ACPI.sys, if and only if a serial port device is connected
I see a 20% "System interrupt" CPU usage in the Windows 10 task manager if and only if a device is connected to the PC with serial port.
With the "LatencyMon" tool, I can see this ...
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Exception and Interrupt difference
I know a Exception is a software Interrupt however after a Interrupt the program counter always returns to the address before the Interrupt was thrown but after a Exception a program may be terminated ...
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Signals vs. polling for I/O (uses very simple example of I/O)
I understand how hardware interrupts work. I have a basic question about I/O, and will use keyboard and characters from key presses as the context for the question.
In a general sense, do processes ...
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Steam deck ssd clone using dd, while following guide, ran out of battery. How to run command again?
So I was running a dd command to clone the ssd of my steam deck to a new one I have connected externally with an adapter enclosure. Problem is like a dummy I didn’t check my battery before starting ...
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How to change process termination shortcuts in a terminal on Windows?
On Windows to close a program, CTRL+C does not always work (eg: ping).
To close anything immediately, CTRL+BREAK can be used.
The problem I have is that on my Dell laptop, there is no BREAK key, Fn+S ...
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Wifi disconnects when System process takes lot of CPU
I have Windows 10 in my laptop. Suddenly, the System process is taking up more CPU and also the System Interrupts process starts.
When it happens, my wifi connection gets disconnected and it shows &...
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Linux high cpu usage - htop shows 90% to 100% cpu usage
I installed a fresh Manjaro Linux on my laptop and it works okay but I noticed high CPU usage when i ran the htop command. One of the cores were constantly busy near 100% and the 2nd one was around 90%...
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Does critical event caused by RadeonSettings.exe mean Nvidia GPU card has hardware fault?
I have been getting "System Interrupts" a few times every day on my Windows 10 PC. This is slowing down my PC and is getting irritating. From the reliability history (see screenshot below), ...
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Radeon settings causes system interrupts despite using Nvidia GPU
I am using Windows 10, AMD Ryzen 7 2700x CPU and Nvidia GPU. Lately, my desktop PC has been slowed down intermittently by system interrupts. From reliability history, I discovered that this was caused ...
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Find out which hardware is causing system interrupts intermittently on Windows 10
Lately, my desktop computer has been getting unusual "System Interrupts" intermittently on Windows 10 which slows down my PC a lot. It lasts for a few seconds to half a minute. It happens ...
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Why sometimes some keyboard keys don't work and other times they work?
Very crazy situation here.
For a considerable time now, some of my keys don't work on the keyboard at some times[usually they are the 1-9 keys], and other thing is sometime some keys continuously keep ...
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How can I clear core0 of any interrupts?
So by default windows is using core 0 for most driver work, for some reason it prefers that core over the others.
With interrupt affinty policy tool, I can move some of the devices using core0 for ...
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How to exit less follow mode without exiting less when xargs is used?
ls -rt *.log | tail -1 | xargs less +GF
I use this command to tail -f my logs, but when I ctrl+c to exit follow mode, it quits less too.
I think it is caused by xargs, because if you just less <...
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ACPI.sys CPU usage: no solution on Windows, but it's solvable in Linux
I know, yet another post of ACPI.sys sitting atop a CPU core. It's seems a different issue from the other posts, though, please, read on. The other proposed solutions didn't work!
It's a P65_67RSRP ...
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What do the interrupt numbers mean in mpstat
I ran the command mpstat -A and the output is shown below
#### THESE ARE MY COMMENTS. THEY WERE NOT PART OF THE ACTUAL OUTPUT ####
Linux 5.5.13-200.fc31.x86_64 (bluegene) 03/04/20 ...
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A suspected Windows audio driver interrupt issue
I have a projector connected to my PC via HDMI, which receives 1920x1080 59.94 Hz.
The projector has a frame interpolation feature, but to run it completely smoothly it needs all frames to arrive in ...
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System interrupts causing high CPU usage
I purchased a Lenovo ThinkPad Helix 2 2-in-1 laptop/tablet second-hand around a month ago, it came with Windows 10 Pro and was working OK for a few weeks but recently I have had a problem with ...
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How to pass Ctrl+C to script called from batch job
I am trying to avoid the effects of pressing Ctrl+C in a batch file somewhat similarly to How to supress "Terminate batch job (Y/N)" confirmation?. However, in my case, I want the signal to ...
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Are interrupts used to signify that output is ready or input has completed? [closed]
Operating System Concepts says:
During I/O, the various device controllers raise interrupts when they
are ready for service. These interrupts signify
that output has completed, or
...
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Will a USB 2.0 LAN Adapter work with interrupts instead of polling if i plug it on a USB 3.0 port?
I have a LAN Adapter (HORI LAN Adapter for Nintendo Switch) that has the ASIX AX88179 USB 3.0 chipset, but it's USB 2.0.
(I checked the cable plug and it doesn't have the USB 3.0's extra pins, also ...
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how to enable MSI-X support for NIC?
I want to utilize the MSI-X functionality of my NIC but its not getting enabled. As you can see below, MSI-X capability is there but disabled. How to enable this?
# lspci -v
00:00.0 PCI bridge: ...
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How can I disable a particular interrupt in Windows 10? [duplicate]
It seems to be caused by the SSD disk installed instead of an optical drive, in the relevant questions about Linux the suggested solution is like:
echo "disable" > /sys/firmware/acpi/interrupts/...
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Do system calls in x86_64 linux still generate interrupts?
In older versions of linux architecture, system calls would always generate an interrupt during their execution. They would be executed by setting the system call number into %eax and parameters into %...
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How does cpu gets interrupted by APIC and how to handle shared interrupts?
From the very little knowledge i have, every PCI device has 4 interrupt pins. Pins from the many different PCI devices on the motherboard (Built-in or external devices) are routed to an IO-APIC (...
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What is the hardware source of Kernel Clock?
According to docs of my South Bridge (ICH9M) it has 4 HPET. How should I found interrupt line, from which System Clock (aka Kernel Clock, Software Clock) is derived?
Seems that it is LOC, but which ...
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High CPU usage when idle - System and System interrupts [duplicate]
I've been trying to find a solution for a while and decided to ask here for more help. I've noticed that my CPU usage is pretty high when idle, even after a cold reboot of the computer:
Task Manager ...
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Windows laptop going to sleep interrupts wifi for other users
I have two Windows 10 laptops in my house. When they are closed (sleep), they often interrupt the wifi for the rest of us on our phones or other devices. I've disabled network sharing on those two ...
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Why does nobody makes a new peripherical connector based on ending interrupts signals to processors such as PS/2? [closed]
Most specialists agree that for a mouse and a keyboard the most efficient way to communicate with the processor is based on interrupts (the way it is done in PS/2 ports) rather than polling (the way ...
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USB hardddisk disconnected while copying a big file
I was copying a big file (20GB) in my USB external harddisk. But because of a problem in my USB port, the connection suddenly cut off. And copying process is naturally interrupted. Now I compare the ...
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What determines whether or not Caps Lock responds while the computer is frozen?
When a computer is not responding in some way, there are different levels of "frozen".
For example, let's say I'm browsing the web on my PC...
If the current browser tab stops responding (clicking/...
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Are Kernels hardware specific?
From my understanding, the Kernel provides the link between software and hardware, and therefore the Kernel must direct system calls being made by OS applications, correct? So would different I/O ...
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What is Non-Maskable interrupts used for?
We have the I/O Interrupt values for prioritizing the task for better response on the computer machine but for which module on computer we have the Non-Maskable interrupts reserved for and what is Non-...
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How does the CPU know when an interrupt occurs?
I am writing an emulator and can't seem to find info on this. What I know is that devices trigger a pulse on the IRQ wire. But the explanations online don't include how the CPU deals with that. Does ...
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What's the cause of double fault on CPU
It's my assumption right, if I say that double fault can and must occurs only in processor's kernel mode (or ring 0 for x86) when any exception (synchronous) happens and never else?
If answer is yes, ...
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Where are hardware interrupt handlers stored?
I've been doing some research on interrupts and it seems that pointers to software interrupt handlers are located in the first 1024 bytes of memory. I haven't been able to find anything about the ...
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System tick timer interrupt priority and blocked interrupts
Assume we have an OS that is running on a CPU which is fully compatible with its requirements. This OS is tick driven. System tick interrupt arrive from external timer (periodic mode) which is ...
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Is latency from hardware interrupts a hardware, driver or kernel issue?
Being a power user I have spent countless hours tuning systems, checking DPC latency blah blah
All of this begs the question why are we still dealing with these issues? I personally can't tell if ...
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What should I do if my system interrupts goes over 20% of my computer?
My computer has been stuttering and going all over the place forever, and I found out recently that it was because my system interrupts kept going all over the place, what should I do?
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Bash script that should do stuff when the first command is CTRL+C-interrupted
I want to make a bash script to automatize a simple task. This task involves running a program (not made by me) which do something until user presses CTRL+C. After that, I have to process the output. ...
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Computer super slow and laggy, while resources are not being used
Ok so I have a custom built PC; specs below:
CPU: Intel Core i7-4700
Motherboard: MSI Z97-G55
RAM: 16GB DDR3
Video Card: PNY nVidia GTX 770
Primary Hard Disk: Samsung 850 Evo
Primary OS: Windows 8.1
...
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How do I find the interrupt vectors used by my laptop?
I am using Windows 7 laptop of Dell make. I am trying to find the number of interrupts and interrupt vectors used by my system. I tried with device manager but I was able to find the interrupts and ...
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how does processor come to know that IRQ or FIQ occur and how it changes to a specific interrupt request mode ?
Suppose processor is in user mode and IRQ occur then its changes to IRQ mode.
But user mode does't have write access to control field of cpsr then how the mode is changed ?
May be i am wrong, Please ...
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PCIe Intterupts beind PLX switch
Firstly, I'm not sure if this is the best place to ask this question, so apologies if it isn't, but given its a quite niche question, I don't know if there is anywhere really suited to ask it.
A ...
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What is the “System Interrupts” process in Windows?
My system is a notebook system with an AMD A10 5750m CPU, R9 M290X GPU, 8GB, 1TB. I’ve noticed a process that is always active called “System Interrupts,” in this moment, it consumes in average 1.5% ...
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Abnormally high interrupt time
I have a new Windows 8.1 box, and in task manager I have an abnormal high CPU usage by System Interrupts (10% - 25% on a dual core i3). What could be the cause and how can I troubleshoot this problem ?...
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What can I do to investigate 50% CPU on Interrupts?
My PC suddenly became very slow.
In my Process Explorer, I noticed that it consistently spends 50% of CPU in "Interrupts" process.
I googled around and found that one possible solution is to go into ...
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Parallelize USB data? Or simply use LPT?
I need to generate a simple system in which host computer interrupts lead out to a non-standard RJ-45 connection (6 pins in binary on/off state) that can be triggered with little latency. The only ...
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How does an operating system prevent an unprivileged process from executing a privileged instruction?
In Unix,
if you are a guest user and did:
chmod 777 /
It would fail.
But how does this internally happen at the hardware level?
So far, I think this is what happens:
The OS tries to execute that ...
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Send an interrupt to the kernel form shell
I am writing a linux module, and I want to test it, so right now it should be triggered when an interrupt happens, so before testing it for real, I want to send the interrupt by hand and see what ...
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System Interrupts are killing my Laptop
I have a Dell XPS 15 Laptop which had started overheating and shutting down. I had opened it up to clean it, which stopped the overheating. and after putting it back, 2 USB ports didn't work properly (...
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