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Questions tagged [smp]

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Linux reboots with no panic when booting SMP configuration from kexec

I'm working on a project involving kexec. I have it working on some of our hardware platforms. On one platform, I'm getting sudden reboots with no panic dump during SMP setup: [ 25.219028] smpboot: ...
Sarvadi's user avatar
  • 121
0 votes
2 answers

Get CPU core id executing a process which suddenly exits

In Linux, in a multi-core processor, ps, top and similar tools can show the CPU logical core id running a specific process. If the process runs for a certain amount of time, it's easy to identify it ...
BowPark's user avatar
  • 4,925
1 vote
1 answer

How to disable CPU hotplug feature (and kernel thread) in Linux-5.10.24

I am working on an embedded Linux system, which is using kernel-5.10.24. As the system resource is limited, so I want to minimize the CPU/memory/storage usage. From ps -ax I found 2 kernel threads as ...
wangt13's user avatar
  • 431
1 vote
0 answers

Does the lack of kernel feature (XENFEAT_hvm_pirqs) cause RedHat EC2 interrupt issue?

I have a RedHat 6.5 on AWS EC2 running kernel, I have installed the ixgbevf driver with the minimum version the doc recommends. After configuration the system now has 2 queues(IRQs): grep ...
Jepsenwan 's user avatar
1 vote
1 answer

Can the 0th physical core used asymmetrically on linux?

In an SMP and with a fair scheduling algorithm I'd expect all physical cores of a machine to get used evenly by linux. In theory I believe this is the case, but in practice I suspect not. Does ...
Andrew Parker's user avatar
1 vote
0 answers

Why I am not able to bind the interrupts with code LOC, IWI, RES when irqbalance is disabled?

On Ubuntu 14.04, I am trying to bind all the interrupts to core 0 and 1 out of 4 cores. I have disabled the irqbalance daemon via file /etc/init/irqbalance.override. Then I went to every interrupt in /...
rahul.deshmukhpatil's user avatar
0 votes
1 answer

linux / SMP -- suspend immediately after wakeup from suspend

(Please note -- I read this post and it is not a duplicate.) So for years, my linux laptop has allowed me to both suspend to disk and (with a little effort) suspend to RAM with one of these two ...
hymie's user avatar
  • 1,710
6 votes
3 answers

Making a IRQ SMP Affinity change permanent

I have to change the smp_affinity of a interrupt permanently. The following code needs to be executed when the server reboots: echo "1" > /proc/irq/152/smp_affinity_list echo "2" > /proc/irq/...
Philip's user avatar
  • 61
1 vote
2 answers

Kernel not detecting multicore cpu

Kernel Version 3.3.4-5.fc17.x86_64 CPU info: sashan@dhcp-au-122 ~ $ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 42 model name : Intel(R) Core(TM) ...
sashang's user avatar
  • 736
7 votes
2 answers

VirtualBox guest: 16 CPUs detected but only 1 online

I am running VirtualBox (using the Qiime image The physical hardware is a 32 core machine. The virtual machine in VirtualBox has been given 16 cores. When ...
Ole Tange's user avatar
  • 35.6k
10 votes
1 answer

"Remote function call interrupts" (CAL in /proc interrupts). What is it?

I'm running a test program which generates a large number of threads and asynchronous I/O. I'm seeing very high counts of these interrupts in /proc/interrupts, the program cannot scale beyond a ...
twblamer's user avatar
  • 929
3 votes
0 answers

How to decide how much memory to allocate per core for MPI app GENE?

This is required information for some MPI using app that I am working with... From its Makefile template: #insert memory per core and uncomment the following line #PREPROC= -D'MB_PER_CORE=750' Note ...
Jakub Narębski's user avatar
7 votes
2 answers

OpenBSD SMP support

The OpenBSD 4.9 release announcement says "SMP kernels can now boot on machines with up to 64 cores;" So OpenBSD does support several CPU's/cores? If i have a Core2Duo cpu in my laptop (t7100) ...
LanceBaynes's user avatar
  • 40.4k