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Questions tagged [interrupts]

52 questions
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Bad Linux storage performance, in comparison with Windows on the same machine

(the question was reformulated, I think it needed to be more structured) We have a Proxmox VE on Dell PowerEdge R610 gen 8 system. The platform is old, but we use it for particular S/W which is well known having no benefits from modern CPU cores,…
Nikita Kipriyanov
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too many nic intterupts caused performance issue on haproxy server

i have a ubuntu 18.04.1 server running with 8-core processor and 8 Gigabyte's of memory. it's a cloud server which is based on KVM virtualization. i am using haproxy 1.8.8 for load balancing on my servers. problem is when i run load-test on my…
aliopalopina
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Windows: high Interrupts and Context Switches rates

I'm experiencing very high rate of Interrupts/sec and CSwitch/sec on my Windows10 machine. I'd look to understand whether it's a normal situation or not. For me the rates are seemed to high. Please advice. Here's Procexp sorted by…
Shrike
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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: 0 0 IO-APIC-level uhci_hcd:usb5,…
ctinnist
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High TLB Shootdown Counts are Affecting Performance

We are running an app in JBoss EAP on RHEL 6.7 and are experiencing significantly different performance across the cluster. Of the 8 VMs, most will respond to requests in ~200ms but one or two will have response times of 2 or 4…
moto_beats
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Setting affinity for network interrupts in Windows Server 2012 R2

We have an application that sends and receives a lot of network traffic - but interrupts are causing us to get lower than max performance. At 20 Mbps input and 20 Mbps output (on a 1 Gbps line), the network interrupts use 100% of core 0 and the…
akonskarm
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High CPU caused by system interrupts

We have a three day old Idacentre A740 AIO PC. (windows 8.1 pro) The system is up-to-date. After we start the PC and "do notthing" the system interrupts taken 40% CPU time approximately. Tried to find what causing we used xperf and wpm. I need help…
holian
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Enabled Intel® I/O Acceleration but no bytes transffered

I enabled IOAT but it seems that no data is transferred using DMA for network: I enabled IOAT in bios. CPU is Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz. I loaded the module in ubuntu 14.04 (3.11.0-26-generic). This is the relevant message in…
Masood_mj
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What's the difference between hardware and software interrupt?

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 reassign the cpu time for another process. Is this…
p1100i
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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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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 invokes kernel functions related to the software…
Tony The Lion
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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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How much interrupts is too much?

On an AWS instance x1.32xlarge (128 cores), we are getting a lot of interrupts per seconds. Here are the top CPUs in interrupts/s: Interrupts Top CPUs CPU0: 140838.0 CPU1: 77867.0 CPU4: 66495.0 CPU6: 59941.0 CPU3: 39096.0 CPU2: 31532.0 CPU7:…
benji
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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?
ctinnist
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does an OS interrupt check for permissions

I'm not sure if I'm at the right place to ask this but I'm learning about operating systems and I can't find any info on this. I read that interrupts are created when a call is made in user mode that requests a system service. But I can't find the…
user1841243
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