Hi, could someone please explain to me what the VCPU option in the advanced settings of a Qube basically means or coud point me to the right link in the documentation (I cannot find it). Right now it is set to “2” in all qubes. Under which circumstances does it make sense to change it? My CPU ha…

There’s a real confusion going on in this thread. Qubes does disable SMT by default - you can check with sudo cat /proc/cpuinfo in dom0 and see that you have the number of cores there. But you can allocate more than the number of cores to a qube - try it. You can allocate more than the number…

It’s the number of virtual CPUs (aka cores) available to a certain qube. Two seems to be a very good default. I have experimented with some “sys-” qubes just having one VCPU, which mostly works fine with proxy VMs although I have the impression my webcam (sys-usb) works more reliably with 2 VCPU…

My configuration using i7-10750H 1 vcpu on all sys-* 2 vcpu on all app Everything is good, never seen full workload.

And what is the maximum I can use? Is the max VCPU core the max physical cores? Does it help for Videochatting to max it out?

[image] No20: And what is the maximum I can use? Never test it, but i suggest it’s depends on your max vcpu [image] No20: Is the max VCPU core the max physical cores? It’s different, you can say vcpu as thread / logical core. Example : Processor Number i7-10750H # of Cores 6 = Pysh…

Found something interesting: [image] Virtualization : Processor, Core, Logical Processor, Virtual Processor : What... Hi all, Processor, Core, Logical Processor, Virtual Processor, thread, Hyper Threading : mmm, many terms that create a lot of confusion in many times, specially with Virt…

Setting VCPU number to 12 on a 6-physical-core machine does bring up better results (than 6, and significantly than 2) in browser benchmark. It’s weird，because Qubes disables SMT by default.

Really interesting stuff. Does running VM’s have to be restarted between vcpu changes?

I have 4 logical core cpu no virtual cores, i set 10 vcpus. Qubes qube lscpu shows it got vcpus. Ok, remade to have 44 vpcus. Each l1 l2 l3 cache adds up. All works. Test good. Setting back to 2. [from 4 to 44 vcpus] [44 cpu htop] Qube dom0 ``` lscpu Architecture: …

Not clear what point you intend to make?

Qubes OS Forum

VCPU number in the Settings

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