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Questions tagged [irq]

42 questions
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ksoftirqd maxing out for network interfaces

We have a Debian server with one link to the internal VLAN, and one to the external - both connect directly to the same switch. On both links, we're intermittently seeing an unusually high amount of bad receive events, as well as high…
user2979044
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Distribute IRQs across multiple cores

I have a centos vm and I am trying to distribute the softirqs across multiple cores. I have modified the smp_affinity_list from 3 to 0-3 but instead of balancing the interrupts, it just moved the interrupts to cpu 0. is there a way at all to balance…
hobgoblin
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FreeBSD IRQ Affinity using cpuset. No mather use hexa or dicimal for -l #IRQ parameter?

I just put my FreeBSD 10.2-STABLE router in production running with Quagga 0.99.24.1, compiled throught Ports. After pass all traffic to this machine the load of S.O. been very hight and everything indicates that the problem is IRQ like shows…
Kalil
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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 IRQ", I enable it, but how do I actually change the…
JorgeO
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IO does not share in multiple CPU

In my linux server IO doesnot share in multiple CPU. as below output ata_piix intrupts share in only cpu0 [root@manage ~]# uname -a Linux manage 3.14.24-1smp #12 SMP Tue Mar 17 15:33:27 IST 2015 i686 i686 i386 GNU/Linux [root@manage ~]# cat…
user95711
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eth0 lots of sudden interrupt

I as looking through munin-generated charts on an Ubuntu 12.10 server. I noticed that starting about 2 weeks ago(this server got a cold-shutdown at that moment) it started generating lots of rtc0 interrups. Anyone know what they are and why they…
quamis
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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 2354. I would like that interrupt were supported…
Andrew
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100% Hardware IRQ while PHP just seems to hang for a second

I'm running the FLOW3 Quickstart on a Fedora machine (virtualized on Windows, if that helps). Each and every single request takes about 1.2 seconds to run the most simple example of this framework. I ran top and was expecting to see some CPU or I/O…
BenMorel
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Uneven CPU usage with NGINX

On my CentOS 7 server, the load on each core is unequally distributed, as seen in the screenshot: some nginx worker seem to take way more load than other. irqbalanceis enabled, hyperthreading disabled. Any idea why ?
NicoAdrian
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Interrupt distribution on intel X710 NIC

I have a VPN server with Intel X710 and Xeon E5-2630 v4. Debian 10. Based on accel-ppp, pptp protocol. Single SFP interface, two vlans. Problem - interrupts are not evenly distributed across queues. In the first queue, more than 10 times more…
Mystic
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Why CPU Softirq time is high sometimes on our PostgreSQL server? How can I find the cause?

Sometimes softIRQ time increases as you see in the server log. Is it normal? how can I find the cause? OS: Ubuntu 18.04 Postgre SQL 12 Thanks
user2085899
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Why do EC2 instances sometimes end up giving a very high IRQ load in htop?

We have a couple of t3.small instances. This is what the CPU utilization graph ends up looking like for both of them (running similar programs). Both seem to end up stabilizing at 20% CPU utilization. When I look at htop, this is what I see. Why…
wireman
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