Questions tagged [interrupts]

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Balance interrupts with irqbalance

I got irqbalance enabled in my rhel8 server and I got following results in /proc/interrupts while testing for tcp latency with qperf CPU0 CPU1 CPU2 CPU3 26: 15840985 ...
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Control-C in Command Prompt that has started by cygstart

I often start "hugo server" from MS Windows Command Prompt that has started via "cygstart cmd" from within a cygwin terminal. It basically works, but it seems that the hugo server just ignores Ctrl-C ...
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My Raspberry crashes

I'm trying to make an omnidirectional robot in Python, I used to use PWM in order to control the dc motor's speed but I thought it caused many troubles, so I erased it and this is my "final" program (...
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77 views

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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379 views

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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1answer
2k views

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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2answers
56 views

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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538 views

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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223 views

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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206 views

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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1answer
5k views

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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1answer
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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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2answers
685 views

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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1answer
2k views

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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265 views

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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872 views

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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1k views

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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2answers
788 views

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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1answer
382 views

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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387 views

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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132 views

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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37 views

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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1answer
2k views

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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1k views

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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309 views

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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1answer
359 views

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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159k views

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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891 views

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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154 views

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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1answer
118 views

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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1k views

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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1answer
144 views

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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1answer
305 views

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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NMI error is received in centos 6.0

I have CentOS 6.0 installed with the kernel version 2.6.32-220.el6.x86_64. I'm getting this error since today. Until this morning everything was ok. Please tell me how could I resolve it. system ...
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1answer
1k views

How interrupts and privilege levels work?

I'm trying to get a better understanding of how interrupts work (both hardware and software) and the privileges that go with them. If we use the NIC as an example. When the OS creates the IDT, does ...
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How do I stop an INTERRUPT_EXCEPTION_NOT_HANDLED on my mv91xx.sys driver?

I have an EVGA motherboard with a Marvell MV99SE91 SATA 6 driver. When I go to their driver downloads page, navigate to Intel X58/ICH10R / 141-GT-E770 - EVGA X58 Classified3 / All / Windows 7 64-bit, ...
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1answer
2k views

Linux shell to execute keystroke (CTRL+C)

I've been encountering a problem while trying to simulate "Ctrl + C" within a bash script. Basically, I am trying to simulate keystrokes after another command has been run. While I seem to have no ...
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4answers
16k views

Disabling System Interrupts in Windows 7 - (high CPU usage, semi solved)

I know the system interrupts topic is pretty common with varying solutions but I had a question about how to implement a solution in Windows 7 the way I did in Ubuntu 12.04. Background: Bought an ...
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1answer
286 views

What is INT=10H / AX=2000H in Windows XP NTLDR?

I currently disassembled NTLDR of Windows XP. During the process of booting, NTLDR uses the following interrupt: INT 10H, AX=2000H, BX=0301H, CX=0H, DX=0H I don't know the meaning of this interrupt. ...
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1answer
625 views

Is it possible to watch interrupts on Windows?

With my linux box I can do the following to watch interrupts live: watch -n1 "cat /proc/interrupts" Is there a way to do this on Windows systems, especially Windows 7?
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5k views

Interrupt-based Equivalent of ctrl+alt+del on OS X

I'm looking for an equivalent of Ctrl+Alt+Del on Windows for OS X. Note: I am not looking for cmd+option+esc and this is not a duplicate of any questions asking for a "task manager". Ctrl+Alt+Del ...
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1answer
2k views

Virtual IRQ's and what they do

I'm surprised but from what I can find there is very little good information on what these really are. Some say they are actually virtual (software interrupts) some say hardware, and a lot say stuff ...
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1answer
2k views

IRQ's & interrupt vector table

I have been reading a lot about IRQs, and it seems there is conflicting and out of date information. Some of it dating back to Windows 95. Here is what I'm confused about. Are both software ...
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1answer
2k views

When a non-vectored interrupt occurs,does the processor ever look up the vector table?

When a non-vectored interrupt occurs,does the processor ever look up the vector table ? Talking of 8085 , is it different ?
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Heavy CPU Usage for Interrupt

As a follow-up to the question Why can't my computer speed up again after closing large applications? … I used Process Explorer to check my PC. I found that there's an average 30-40% of CPU being ...