The interrupts tag has no wiki summary.
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Softirq has raisen without reason
Monitoring munin stats I found that on CPU's graph there was softirq value increased.
What might be the reason? Currently I am experiencing problems with mysql cpu consumption. But how those things ...
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is context switching slow
I'm having high system CPU usage with high-load Apache server running.
mpstat shows low %irq and %soft, but Apache spawns a lot of sub-processes, and I suspect context switches to be the reason of ...
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2answers
443 views
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.
...
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0answers
189 views
Disabling IRQ#16 when removing DVI cable [closed]
I have a computer running with a Blackmagic Decklink card and a usbscreen. The problem i'm having is somethimes a irq conflict occurs and the OS disables irq16 witch both the decklink card and the usb ...
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1answer
203 views
Linux Kernel IRQ Routing with irqbalance / kernel options
I'm trying to get my Xen Dom0 distributing the irqs in an smp enviroment. As far as I know there are 2 Options:
Use irqbalance
Configure the kernel without cpu hotplug support
My System is Debian ...
4
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1answer
1k views
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 ...
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2answers
284 views
Can it be because of any Kernel Bugs?specifically spin lock
We are running ubuntu 11.04 with 2.6.38-13-generic kernel on
Intel(R) Xeon(R) CPU E5620 @ 2.40GHz with 48 GB RAM dedicated server with Hardware RAID.
top command output is showing many kernel ...
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1answer
116 views
Can a large number of network hardware interrupts cause a machine to be underutilized?
I don't know much about networking sorry.
I'm building a client / server where the server streams a lot of data to the client and I'm trying to maximise throughput (through TCP).
If I run both client ...
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2answers
1k views
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 ...
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0answers
92 views
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 ...
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3answers
662 views
Linux Interrupts Issue
Is there a simple way to determine if interrupts are a performance issue? I have the following from cat /proc/interrupts but really don't have a history of this server so I don't know if this could ...
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1answer
333 views
High interrupts, sometimes freezes
We have a Win 2003 R2 TS (x86) which has some "bad days".
I have not been collecting data on this myself until just now, but it seems most of the time it runs fine, but some days we see high CPU ...
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1answer
477 views
What's the difference between hardware and software interrupt? [closed]
I'm gonna sketch my understanding of both. I've googled around but i'm not sure about my knowledge. Please correct me!
Hardware interrupt is generated by the operation system event scheduler to ...
0
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1answer
228 views
Irregular interrupts balance in AMD Opetron Quad-Core
I had a problem with CPU7 overload. I found that it was caused by the eth0 interrupts, as you can see on below cat /proc/interrupts. I'm using 2.6.35.2 kernel and Quad-Core AMD Opteron(tm) Processor ...
4
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1answer
201 views
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 ...
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5answers
3k views
What network loads require NIC polling vs interrupts?
Does anyone have some data or basic calculations that can answer when frame coalescing (NAPI) is required and when a single interrupt per frame is sufficient?
My hardware: IBM BladeServer HS22, ...
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2answers
1k views
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 ...
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1answer
4k views
NAPI vs Adaptive Interrupts
Could anyone please explain how two following technologies are used to mitigate interrupt overhead under high networking load?
Adaptive-rx/Adaptive-tx, and
NAPI;
I would appreciate an answer that ...
2
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1answer
614 views
Distribute IP packets accross different NIC queues with MSI (Message Signalled Interrupts)
NetXtreme II BCM5709 Gigabit Ethernet NIC supports MSI feature (Message Signaled Interrupts) and it has 8 queues. Each queue has its own Interrupt handler in /proc/interrupts. What I am trying to ...
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3answers
2k views
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?
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1answer
384 views
What are RES interrupts (from Munin)
Our server recently had a very bad day, and one of the indicators/reasons seems to be that RES interrupts are douple their normal value, but what does this mean ?
(other interrupts: LOC+100%, ...
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2answers
221 views
kernel software trap handling
I'm reading a book on Windows Internals and there's something I don't understand:
"The kernel handles software interrupts either as part of hardware interrupt handling or synchronously when a thread ...
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1answer
7k views
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 ...
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2answers
639 views
Alternative to /proc/interrupts
I would like to obtain information about interrupts assigned to my network cards. Is there any other way, than /proc/interrupts?
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2answers
720 views
NIC interface names in /proc/interrupts
When I look at /proc/interrupts:
$ cat /proc/interrupts
CPU0 CPU1
(...)
12: 4 0 IO-APIC-edge i8042
14: 145 65310875 IO-APIC-edge ide0
50: ...
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3answers
2k views
cause for high Interrupts and context switches
Hey guys,
I have a quad core and I have spotted on munin (monitoring interrupts and context switches), that my interrupts and context switches spiked to 25k a second while the average was 250 for some ...
0
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2answers
879 views
Handle IRQ in Debian
I'm running Debian and I'm running into an IRQ problem, two cards that generate a lot of IRQ interrupts are sharing the same IRQ (16). I found on the HP Bios an option that states "allow OS to trip ...
4
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3answers
5k views
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?
