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1answer
16 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. ...
0
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0answers
12 views

Linux interrupt handling : bottom half

In Linux, the handling of interrupt handler is divided into two components : top half, and bottom half. From my understanding, the bottom-half of an interrupt handler can be handled in many ways : ...
0
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1answer
75 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 ...
0
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1answer
45 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 ...
0
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0answers
21 views

why an interrupt context should not sleep?

In linux i have studied that an interrupt context should not sleep because it can not wake up again. Why it can not wakeup ? What happened if its go to sleep ? please explain in detail Thanks in ...
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0answers
56 views

What can generate system interrupts?

System Interrupts uses 40% CPU usage and suddenly laptop lags causing disabling the WiFi adapter, updated BIOS, updated wifi adapter, Acer aspire 4736z.
0
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1answer
33 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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0answers
210 views

Network connection interrupts “ping transmit failed, general failure”

I have a headscratcher right here. Normally I can fix my own network issues with help of googling, but with this one I have no idea where to begin. I recently moved places where I had to create a new ...
0
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1answer
47 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 ...
4
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2answers
10k 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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0answers
18 views

Cortex M0 NVIC interrupt issue

Advanced thanks for the help! We have encountered an issue where the CPU is not handling/calling the ISR handlers registered at the IRQ vector map. We see that in the CPU NVIC registers, the ...
0
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0answers
39 views

Which is the Highest interrupt level assigned device in Linux system

I need to know which device has highest interrupt level cpu/processor or keyboard.I searched through the Internet but didnt find a satisfactory answer.
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votes
1answer
768 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 ...
0
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1answer
58 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 ...
1
vote
1answer
34 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 ...
0
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0answers
10 views

CentOS ksoftirqd using CPU [duplicate]

I have a VirtualBox VM running CentOS 6.5 and "top" reports that ksoftirqd is using around 32% of CPU. The file /proc/interrupts reports: CPU0 0: 989646990 XT-PIC-XT ...
8
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2answers
533 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 ...
0
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1answer
38 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 ...
1
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1answer
189 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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0answers
34 views

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 ...
2
votes
1answer
303 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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votes
1answer
1k views

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, ...
1
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1answer
312 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 ...
0
votes
2answers
12k 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 ...
3
votes
1answer
11k views

Installing Chromium OS on USB throws error

I'm trying to install Chromium OS on my netbook via USB. I have the USB, went into Disk Utility, clicked erase. And it erased all data. Format is Fat 32. However, when I run the Chromium OS Image ...
1
vote
1answer
207 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 ...
2
votes
1answer
289 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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3answers
689 views

How to remove installation on startup in Windows XP?

I have tried to install SVNNotifier, but interrupted in middle of installation process and deleted installation file. And after when I start system I always receive small windows to continue ...
2
votes
1answer
3k 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 ...
0
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1answer
732 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 ...
2
votes
1answer
1k 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 ...
2
votes
1answer
948 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 ?
6
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1answer
1k views

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 ...
3
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1answer
4k views

How do hardware interrupts work compared to software interrupts?

To give you an impression of the level of detail I'm interested, one example. I know a system call ultimately leads to a trap which lets the processor store registers, switch to supervisor mode and ...
38
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4answers
3k views

How computers display raw, low-level text and graphics

My ever-growing interest in computers is making me ask deeper questions, that we don't seem to have to ask anymore. Our computers, at boot, as far as I understand it, are in text mode, in which a ...
0
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1answer
2k views

What Is “Hardware Interrupts” Process In Windows 7?

I keep seeing it with Process Monitor software:
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0answers
261 views

Usb wireless adapter causing DPC spikes

Bought 2 new TP-LINK WN722N USB wirless adapters as they were the highest rated on Newegg and were a great price. Both of them cause abnormally high DPC & Interrupt usage in Process Explorer and ...
3
votes
1answer
631 views

Simulate keyboard interrupt to gracefully exit task in Windows?

I have a process that doesn't behave when I do a taskkill -f, but the only option taskkill gives me is to kill it with -f. When I have the exe running in the Command Prompt I can hit Ctrl + C twice ...
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0answers
475 views

Again = CPU usage jumps to 100% -> WHEN <- machine is idle (not the idle process) [duplicate]

Possible Duplicate: CPU usage jumps to 100% -> WHEN <- machine is idle (not the idle process) I posted this question a while back here and received several suggestions on how to ...
8
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6answers
2k views

CPU usage shoots to ~50% and stays there until suspended

This is the Windows Vista problem, seen, I think, mostly on dual processor laptops, where % CPU suddenly shoots to about 45% and stays there. Once this has happened, % CPU will never return to normal ...
5
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1answer
1k views

Hardware interrupts and system unresponsiveness

Very occasionally, about once a week, my Windows Vista Business machine will completely lock up for anything between a minute and several minutes. Once this happens, it recurs more frequently until I ...
0
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1answer
478 views

Interrupt Descriptor Table and System Call Table?

Anyone please help me find out the relation between these two. Read somewhere that "The IDT is initialized one first time by the BIOS routine but Linux does it one more time when it take control." ...
4
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2answers
389 views

Can someone explain to me how the CPU finds the source of an interrupt in OS theory?

I am currently doing a module in Operating Systems theory and I have a few concepts that I am unable to grasp - would this be the right place to ask questions ? My main question is about interrupts. ...
4
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2answers
4k views

Diagnosing Hardware Interrupt Process Usage Problem on Dell Dimension

I've got a 5 year old Dell Dimension running WinXP SP3 that's really chugging along - Process Hacker (and Windows Task Manager) both report abnormally high Interrupt CPU usage. This ranges from ...
3
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2answers
852 views

Single core to Dual core and Interrupts

Does increasing the number of cores result in the increase in the number of interrupts that can be handled by that processor ?
3
votes
1answer
909 views

Micro sound breaks/interrupts on Windows 7

I've been experiencing strange behavior recently. When listening to mp3 or watching movie or whatever that uses sound, I get micro breaks in sound. It's like it hangs or cuts a fragment for about ...
2
votes
1answer
536 views

x86 exceptions and flags

please, I know that when you for example divide by zero, the aproptiate flag is set in CPU flag register. But today I read that there are special interrupt vectors (I think the first 16 in IVT) that ...
2
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1answer
319 views

In a dual core processor, Do both the processors halt execution when an interrupt occurs?

suppose two cores of a CPU are running two threads parallelly, and an interrupt occurs one on of them, does the other processor also stop execution ?
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4answers
6k views

How does an OS communicate with other hardware components?

How can a program running on a CPU (mostly OS) access other PC hardware? Such as Graphic card, HDD and so? From what I read, in DOS, this was done using BIOS calls, specifically the INT instruction. ...
0
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1answer
336 views

BIOS interrupts, privilege levels and paging

I was learning about Intel 8086-80486 CPUs and their interactions with hardware. But I still don´t understand it quite well. Please, help me fill blank spots. First, I know that the CPU communicates ...