The interrupt tag has no wiki summary.
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How to troubleshoot high kernel time (high network usage; high interrupts)
I've noticed that I have high kernel time when doing a lot of network traffic in Linux. I also noticed that 45% of my CPU is spent doing interrupts. How can I further troubleshoot this?
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1answer
52 views
Are threads which are executing blocking system calls awoken by interrupts?
I've been reading a bit about threads and interrupts. And there is a sections which says that parallel programing using threads is simpler because we don't have to worry about interrupts.
However, ...
3
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1answer
102 views
Making a IRQ SMP Affinity change permanent
I have to change the smp_affinity of a interrupt permanently. The following code needs to be executed when the server reboots:
echo "1" > /proc/irq/152/smp_affinity_list
echo "2" > ...
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0answers
59 views
Further clarification as to whether interuppts are disabled in top-half handler or not [closed]
Recently I came across a note in an online post that states the following:
In modern kernels, most of the differences between fast and slow interrupts have disappeared. There remains only one: ...
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2answers
2k views
How does the Linux kernel handle shared IRQs?
According to what I've read so far, "when the kernel receives an interrupt, all the registered handlers are invoked."
I understand that the registered handlers for each IRQ can be viewed via ...
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0answers
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Which softirq will execute if interrupt is generated on same line: preempted or new softirq?
Following is the sequence of events:
interrupt generated at line 1.
line 1 disable.
ISR executed. Set sofirq bit 1
line 1 enable.
softirq executes and suddenly interrupts come at line 1.
softirq ...
3
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1answer
776 views
What does Linux's “nointremap” option do?
Ubuntu 12.10 alpha 2 works perfectly on my new 11" 2012 Macbook Air, but only when I boot with the "nointremap" option. Supposedly this is not good to use as a permanent solution. What exactly does ...
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0answers
249 views
“Remote function call interrupts” (CAL in /proc interrupts). What is it?
I'm running a test program which generates a large number of threads and asynchronous I/O. I'm seeing very high counts of these interrupts in /proc/interrupts, the program cannot scale beyond a ...
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18 views
Can an interupt be processed by software, without hardware support? [duplicate]
Possible Duplicate:
Can an interrupt be soley processed by software without harware support?
Can an interrupt be processed by software without the need for hardware suppport? Assume a x86 ...
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1answer
140 views
Can an interupt be processed by software, without hardware support? [closed]
Can an interrupt be processed by software without the need for hardware suppport? Assume an x86 architecture.
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3answers
1k views
Ctrl + c will not kill process
I have looked for answers and so far have found nothing to answer my question. I am currently logging in to my Ubuntu server and upon running a process I can not run any of the interrupts on it. Here ...
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1answer
347 views
Interrupt sequence CTRL+C does not work for user
In any terminal operating under GNOME, if I press Ctrl+C, I only see a question mark. Same goes for Ctrl+Z. The output of stty -a | grep intr is:
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ...
5
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1answer
3k views
What are software and hardware interrupts, and how are they processed?
I am not sure if I understand the concept of hardware and software interrupts.
If I understand correctly, the purpose of a hardware interrupt is to get some attention of the CPU, part of implementing ...
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3answers
2k views
What is the relationship between system calls, message passing, and interrupts?
I am reading the Wikipedia article for process management. My focus is on Linux. I cannot figure out the relation and differences between system call, message passing and interrupt, in their concepts ...
3
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2answers
1k views
change interrupt smp_affinity
As you can see below, nvidia is sharing the intrerrupt and the interrupt is using only CPU0, how can I change the interrupt for nvidia, and how can I make it use both CPU's ?
Here is an article ...
2
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1answer
951 views
What determines whether an interrupt is IO-APIC-edge or IO-APIC-level?
Looking at the contents of /proc/interrupts on an x86 Linux, I see that some of the interrupts are IO-APIC-edge while others are IO-APIC-level.
I wonder what determines the interrupt type, is it the ...
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1answer
367 views
Is there a utility that interprets /proc/interrupts data in time?
is there something out there ? Like top is for ps
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1answer
917 views
What happens in the Top half and Bottom Half processing of Interrupts?
I would like to know more about Top half and Bottom Half processing in the Context on Interrupts. Could someone explain me the exact things happening in both scenarios.
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2answers
893 views
'fast interrupts' in Linux
as far as I know, Linux has 'fast interrupts', those that were requested with SA_INTERRUPT flag; fast interrupts are executed with all other interrupts disabled on the current CPU. But how does it ...
3
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2answers
794 views
re-entrency of interrupts in Linux
I was reading "Linux device drivers, 3rd edition" and don't completely
understand a part describing interrupt handlers. I would like to clarify:
are the interrupt handlers in Linux nonpreemptible?
...
9
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3answers
8k views
How is an Interrupt handled in Linux?
I just know that Interrupt is a hardware signal assertion caused in a processor pin. But I would like to know how Linux OS handles it.
What all are the things that happen when an interrupt occurs?
