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Questions tagged [vcpu]

79 questions
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how do I add a vcpu to one of my KVMs in QEMU?

I want to add a vcpu to a virtual server in QEMU. I tried editing the XML file in /etc/libvirt/qemu and starting the server, but that does not seem to work.
Zhenya
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vCPU and RAM for ESXi Server Scenario

I will be deploying 3 VMs on a 4 CPUs x 2.799 GHz (Intel Xeon W3530), 24GB RAM ESXi 4.1 server. They will be: Win 2k8 R2 with IIS Server, php web gui. Win 2k8 R2 with SQL Server 2008. Win 2k8 R2 with Java App using Hibernate. my question is, what…
JoeSlav
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Citrix XenApp slowness on ESX 4

I need some help with a some CPU constraint issues( i think) diagnosis. I have a client with a Citrix Xenapp farm (5 desktop servers/9 Application servers) spread accross 12 ESX hosts running ESX4.0. All Citrix servers, desktop and application…
rob jaudon
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Is there a way to give a xen vm with windows more than one virtual cpu?

I have a quad core machine which is running debian with a xen kernel. I am running a couple linux servers on there which don't do a lot of CPU intesive stuff, but I have there a windows server 2008 vm, which seems to be sucking the life out of one…
Thomaschaaf
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Disable CPUs on boot but allow hotplug in Xen

I would like to create a Xen VM with 32 possible VCPUs but have the guest OS only enable 2 of them on boot. Are there some kernel parameters I can pass in to enable this? I've played around with various combinations of additional_cpus,…
Michael Mior
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Optimizing CPU and Memory use on Multi-socket NUMA server

I am building a server that will be used by interns in my company to connect to and perform some tasks. The server is running AlmaLinux 9 and using KVM to run Windows 11 guests. The server has 2 CPU sockets, each running 8-core CPU's. After reading…
Fabz
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QEMU SMP options

I'm trying to understand the QEMU smp option. Currently I have set it to: smp 4 As far as I understand that should create 4 vCPU (with 1 core and 1 thread I suppose). Would it be better for performance if I set it to: smp…
Maestro
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QEMU load average vs cpu count

When I configure more CPU cores, the load average in my Guest OS as shown by top also increases linearly. I'm trying to understand why this happens, because I expected either the opposite or at least for it to stay the same. As load average should…
Maestro
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How to configure Openstack so that it considers that 32 vcpu is available instead of 16vCPU?

OpenStack Xena CentOS 8 Stream My task is to increase from 16 vCPU to 32 vCPU. I'm trying to overcommit, but it doesn't work. I have one controller and one compute. Compute output: [root@controller ~(keystone)]# openstack hypervisor stats…
Maksim
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AWS EC2 CPU Spike for 1 minute

Im running a aws linux 2 EC2 instance and noticed throughout the month there will be sudden spikes in the CPU usage where it gets close to 90% and then drops off. However looking at the average over 2 week periods the average is usually less than…
Yeak
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How to load one physical CPU in a system with virtual cores?

I have an AMD processor with 4 physical cores and SMT enabled. Because of the latter, I see 8 virtual cores in a Linux box. For example, stress command can spawn a number of workers spinning on sqrt(). If I run stress with -c 1 option, using mpstat…
mate200
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how libvirt cputune config goes to qemu-kvm

I am porting xml libvirt config to qemu executable arguments. Simply I have .xml vm config from virsh edit vm-name and I want to run the same vm machine by executing qemu-system-x86_64 with special command line parameters. Die to my specific needs I…
Andrey
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How to identify CPU(s) on Linux EC2 instance?

I'm running a Linux c5d.9xlarge instance and wondering what CPU it's using. Amazon's Instance Types webpage states: C5 and C5d 12xlarge, 24xlarge, and metal instances have the following specs: Custom 2nd generation Intel Xeon Scalable Processors…
apptree
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How vCPUs are calculated?

Yesterday I contacted my vendor to buy a server, and I asked them how I should calculate the CPU and RAM requirements for my server, given that I want to create multiple virtual servers on it He said 12 core (6 core x 2 sockets) = 24 Logical…
washaq
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vSphere CPU/vCPU Performance

This might be a rookie question but if I'm currently on a 4:1 oversubscription of my CPU ressources does that mean that my processors performances are divided(splitted) into 4 lower perf. vCPU? Will a vm using 4 vCPU will just divide a pCPU into 4…
Louis Roy
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