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Questions tagged [interrupts]

52 questions
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Areca Raid Controller "ARC-1883" fails when heavy network load

I have a "Areca ARC-1883IX-12" Raid Controller firmware 1.54 running OpenSuse 42.3 with XEN Hypervisor. I use four instances of a copy command to copy four big binary files within the local file system : cp /arecaDriveMnt/bigfile1.dat…
Viktor Carlson
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Cannot balance eth0 IRQs across CPUs

I have servers which deal with a large number of network packets. I've seen evidence that user space processes running on CPU0 have their performance impacted when network load is high. I'm fairly sure this relates to interrupt handling,…
Andrew Parker
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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 Squeeze, Xen 4.0.4, Kernel 3.2.31. My Problem…
tim
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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 be causing any issues. I found the definition of…
user739866
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QEMU-KVM bug: guest interface locks up a core with soft interrupts

Bug: I have a qemu-kvm on Ubuntu (host 14.04.5 LTS 3.13.0-95; cannot upgrade; , guest Ubuntu 18.04.03 LTS 4.15.0-65) Guest has two network interfaces, directly (VEPA) connected to two separate host physical interfaces. A program running on guest…
Alec Matusis
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How irqbalance works

Does irqbalance add kernel module? How a user space daemon is able to assign interrupts to different processors? If it is a user space process that is doing it, won't kernel to user space context switch delay the interrupt processing?
kalyan
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Does disabling VT-d and interrupt remapping break MSI-X?

So I have a Dell PowerEdge R610 server running Debian Jessie which according to some docs has a faulty chipset: https://www.novell.com/support/kb/doc.php?id=7014344 (Intel 5500 rev 13). The provided shell test confirms the presence of this chipset:…
krdx
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cause for high Interrupts and context switches

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 time. No idea what happened, and also no idea what does it…
Adam Benayoun
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Interrupts are confined to only CPU0 Core why?

Why interrupts are confined to CPU0, rather than using other cores that are available? Only for LOC: I could see the interrupts being distributed to other cores why it's not happening for eth0 and eth1? CPU0 CPU1 CPU2 …
user204857
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Can't update smp_affinity

As part of the experiments that we are running to optimize the performance of the applications on our Linux box we are trying to assign all the network interrupts to a single cpu core. Unfortunately, it doesn't seem to work the way it should. E.g.…
sad2k
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High Interrupts and DPC in Windows after reboot

We have seen this several times in Win 2003 R2 32bit, XenApp 4.5 server where we have to reboot them to get rid of the problem. Sometimes more than once. We've had this issue on both smaller virtual servers and physical servers. This is what the…
Gomibushi
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Disabling IRQ#16 when removing DVI cable

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 screen is connected to. If i remove the dvi…
Ryezs
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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 usage, most likely from interrupts. Using procexp I…
Gomibushi
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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 accomplish is to tell NIC which packets should go to…
user389238
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Network discards on powerful Linux server

I got quite powerful Linux server - Dell PowerEdge R6515 it contains x64 cores using AMD Epyc cpu. Also there're dedicated LAN PCI: lspci | grep 10G 41:00.0 Ethernet controller: Intel Corporation Ethernet Controller X710 for 10GbE SFP+ (rev…
Edvinas
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