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Questions tagged [interrupts]

54 questions
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4 answers

How can I find out what is causing interrupts on Windows?

Occasionally I come across servers (Windows 2003 and 2008) with high processor % interrupt time. Is there a way to see what program or device is causing the interrupts?
jlupolt
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What's the cause of high LOC interrupts?

I'm seeing huge spikes in LOC interrupts - around 4 million per second, what exactly is the LOC interrupt, what would cause these spikes, and what can I do about it? Here's a Munin graph illustrating these spikes:                      Here's the CPU…
Paul Dixon
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CPU0 is swamped with eth1 interrupts

I've got an Ubuntu VM, running inside Ubuntu-based Xen XCP. It hosts a custom FCGI-based HTTP service, behind nginx. Under load from ab the first CPU core is saturated, and the rest is under-loaded. In /proc/interrupts I see that CPU0 serves an…
Alexander Gladysh
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How to ban hardware interrupts with IRQBALANCE_BANNED_CPUS on Ubuntu?

I would like to ban interrupts from certain CPUs. I heard about the IRQBALANCE_BANNED_CPUS option. I see irqbalance is running in the background of my machine. Where do I go to edit and how do I configure that option? For example, I want to exclude…
TraderJoeChicago
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how to tell if NIC has multiqueue enabled?

Can anyone tell me what command i run to determine if my 10G NIC is running in single RX-TX queue mode or multiqueue? It looks like it only has 1 RX/TX queue according to cat /proc/interrupts root@hostname:scripts]# cat /proc/interrupts | grep…
dobbs
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What is this column in /proc/interrupts?

Can someone assist me in analyzing the data in this output from my /proc/interrupts file? $ cat /proc/interrupts CPU0 CPU1 0: 22 0 IR-IO-APIC 2-edge timer 1: 2 0 IR-IO-APIC 1-edge …
Matt K
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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 %ebx, %ecx and so on, followed by issuing the…
arrwags
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High system interrupt rate

My server has 24 CPU cores, 96G memory, installed CentOS 7.2 x86_64. After starting my program with a large data set, my program will use about 50G memory, and the Linux system will show a high rate of system interrupts, but context switching rate…
user416983
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CPU load inhibits interrupts on Linux

I have an Ubuntu box with 3.2 kernel, CPU with 2 cores and CAN (Controller Area Network) card based on SJA1000 controller attached via PCI bus. I'm testing receive capabilities of the card. It can handle about ~4000 packets per second, the…
user117006
5
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1 answer

How does a NIC send a hardware interrupt?

Some context. A few weeks ago, a NIC was replaced on a box without much troubleshooting to find a clear resolution to the problem. A senior administrator got into a small tiff with an entry-level admin concerning hardware interrupts and ethernet…
barix
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What is "Interrupts" process and why it so loves my CPU?

I have windows XP SP3 on Intel Core Duo 2GHz. The "Interrupts" process, according to the Process Explorer, continuously take 30-40% CPU. Is it normal?
Kamarey
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BSD 50% interrupt utilization in irq0/clock

On OpenBSD on an Atom 450, with HPET configured in the BIOS and not, also with Hyperthreading/ACPI on-off, nothing seems to make a difference. Here's my vmstat -iz # vmstat 2 procs memory page disk traps cpu r…
RandomNickName42
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ethernet smp_affinity vs /proc/interrupts vs /sys/class/net/ethX/device

My goal is to configure our CentOS ("free" RHEL) 5.x servers for custom low-latency network programs. I would like to experiment with binding ethernet NIC interrupt handling to the same CPU on which the program runs (to hopefully improve cache…
Matt
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Software Interrupts CPU time is high and keeps growing

My system is a Debian 6.0.3 x86_64 box w/kernel 2.6.32-5-openvz-amd64, it hosts a number of OpenVZ containers. I have recently migrated from LXC/newer kernel from backports repo to the stable OpenVZ kernel to resolve network issues but got another…
Alex
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Server suddenly has high softirq cpu use after reboot

A 48 GB RAM virtual server maintaining about 25k TCP connections (devices in the field logging in to set up an SSH tunnel) ran out of RAM and started swapping, and getting slow, etc. We upgraded and rebooted. Even after the 25k connections had been…
Halfgaar
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