VirtualBox, Proxmox, QEMU and CPU Vs vCPUs

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On 2024-07-02 14:09, greg zegan via PLUG-discuss wrote:
> speaking of VMs I see they are migrating from VMWare to OpenShift from
> Red Hat at work.
> Anyone know more about this? Is it cost based?
> no one is saying why here.
> 
>  On Tuesday, July 2, 2024 at 02:05:11 PM MST, Ryan Petris via
> PLUG-discuss <plug-discuss at lists.phxlinux.org> wrote:
> 
> I think the option you're looking for is called "affinity":
> 
> https://pve.proxmox.com/pve-docs/pve-admin-guide.html#qm_cpu_resource_limits
> 
>> With the affinity option, you can specify the physical CPU cores
>> that are used to run the VM’s vCPUs. Peripheral VM processes, such
>> as those for I/O, are not affected by this setting. Note that the
>> CPU affinity is not a security feature.
> 
> That said, I'm wondering why you're wanting to do this, specifically
> what you think you're going to gain over just allowing the kernel to
> schedule things the way it normally does.
> 
> For instance, it's not going to lock that core specifically for use to
> that VM; other processes can still use that core. You'd literally have
> to set the affinity of every single process on your system to specific
> cores which would be an extreme pain. You still wouldn't have much
> control over which cores receive interrupts and whatnot so even then
> you still wouldn't have complete control.
> 
> Just let the scheduler do its thing, otherwise you're likely going to
> end up with weird issues that no one can help with or explain.
> 
> On Tue, Jul 2, 2024, at 1:51 PM, Snyder, Alexander J via PLUG-discuss
> wrote:
> 
>> I have a VM running with QEMU on Debian, v is a TrueNAS. Although
>> they give you a GUI to select options, it is my understanding that
>> it's just pure QEMU running on the backend.
>> 
>> In this VM, I have vCPUs configured.

Thanks!!

>> 
>> --
>> 
>> Thanks,
>> 
>> Alexander
>> 
>> Sent from my Google Pixel 7 Pro
>> 
>> On Tue, Jul 2, 2024, 13:43 Keith Smith via PLUG-discuss
>> <plug-discuss at lists.phxlinux.org> wrote:
>> 
>>> Hi,
>>> 
>>> I've started to skim the Ubuntu docs on QEMU. It talks about
>>> vCPUs.
>>> 
>>> I've run both VirtualBox and Proxmox. Seems both VirtualBox and
>>> Proxmox
>>> 
>>> only allow for CPU allocation at the CPU level.
>>> 
>>> I'd really like to be able allocate vCPUs.
>>> 
>>> Do I understand this correctly?
>>> 
>>> Thanks!!
>>> 
>>> Keith
>>> 
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