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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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1answer
18 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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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 ...
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2answers
346 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 ...
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1answer
35 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
116 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
20 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 ...
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1answer
171 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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1answer
404 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, ...
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0answers
36 views

Is it possible to accurately time the reception of serial characters?

I want to accurately (like - microseconds or better) determine the arrival time of serial characters under Windows (XP). I can measure time accurately using the CPU hardware counter easy enough, ...
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1answer
186 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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2answers
8k 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
7k 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 ...
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1answer
172 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
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1answer
239 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
432 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 ...
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1answer
2k 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
570 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
801 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
695 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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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 ...
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1answer
3k 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 ...
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4answers
2k 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 ...
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1answer
1k views

What Is “Hardware Interrupts” Process In Windows 7?

I keep seeing it with Process Monitor software:
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0answers
239 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 ...
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1answer
478 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
472 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 ...
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6answers
1k 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 ...
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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 ...
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1answer
422 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." ...
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2answers
311 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. ...
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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 ...
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2answers
694 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 ?
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1answer
742 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 ...
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1answer
458 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 ...
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1answer
294 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
5k 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. ...
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1answer
314 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 ...
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1answer
519 views

Sound and Audio devices sharing IRQ numbers, high hardware interrupts, laggy video

After a fresh reinstall of Windows XP SP2, and re installation of my drivers from their official sites, my computer has been experiencing speed problems after a day or so of being on. After opening ...
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2answers
1k views

difference between IRQ and Interrupt Priority level

Can someone tell me if the IRQ of a device is different to the Interrupt Priority level?
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1answer
351 views

How do I reassign conflicting IRQs?

My computer has several conflicting IRQs, which I think may be causing some instability in the system. I would like to reassign the conflicting IRQs to unused slots. However, when I open a device's ...
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1answer
8k views

What is the interrupt key for Linux command “less”

When you do shift-f with less, you can see the file update in real time, and you get the "Waiting for data...(interrupt to abort)" message. The updating works fine, but what is the interrupt? nothing ...
3
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2answers
591 views

Computer massively slow. Interrupts through the roof

For whatever reason, my laptop has become massively slow on basically any operation. I cranked up the SysInternals Process Explorer and found that the CPU value of Interrupts goes through the roof on ...
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2answers
1k views

Guidelines for troubleshooting high interrupt rate

Sample readings: high or above normal interrupt rate (at idle), at approximately 1505/sec Information obtained from Process Explorer and Kernrate System calls approximately 6132/sec Context ...