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1answer
44 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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0answers
21 views

Windows 10 update interruption

I accidentaly turned off my computer at the beginning of windows update. After powering it on again the updates and boot went through normally. Should i somehow check for any installation errors, or ...
0
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1answer
59 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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1answer
61 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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0answers
26 views

Interrupt kernel process or another interrupt [closed]

When interrupt occurs, how its handler knows that what ran before its execution (I.e. what this interrupt interrupts)? How this interrupt recognizes if kernel thread or system call or another ...
2
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1answer
42 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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0answers
22 views

CPU x86 - external interrupt invokes exception handler

If I will be wrong, please correct me. In x86 architecture, there are 256 interrupt vectors. The first 32 are exceptions/internal interrupts/synchronous interrupts. What will happen if external device ...
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0answers
24 views

Intel 8259 PIC - Acknowledge interrupt

Assume we have a system with CPU which is fully compatible with Intel 8259 Programmable Interrupt Controller. So, this CPU use vectored interrupts, of course. When one of eight interrupts occurs, PIC ...
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0answers
59 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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0answers
42 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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0answers
90 views

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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1answer
26 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
631 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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1answer
224 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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0answers
93 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.
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1answer
133 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
140 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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2answers
84k 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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1answer
837 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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1answer
104 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
65 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 ...
8
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2answers
758 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
52 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
267 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
55 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
468 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
2k 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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1answer
504 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
13k 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 ...
1
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1answer
239 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
363 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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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 ...
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1answer
1k 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
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 ...
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1answer
1k 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
2k 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
5k 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
4k 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
2k views

What Is “Hardware Interrupts” Process In Windows 7?

I keep seeing it with Process Monitor software:
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0answers
299 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
776 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
478 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 proceed, ...
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5answers
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 ...
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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
592 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
621 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
5k views

Diagnosing hardware interrupt process usage proble

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 10-70%...
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2answers
1k 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
1k 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 0.5s....
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1answer
643 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 ...