in xcp-ng host lscpu only show 8 cores for on Ryzen 9 5900x

cbaguzman

Hello everyone. I write because I installed XCP-NG (8.2.1) in a new hardware. This equipement has a Ryzen 9 5900X with a Asus Prime x570-p mother board.

When finished my instalation I runed lscpu and the system returned:

 Model name: AMD Ryzen 9 5900X 12-Core Prossesor
Core(s) per socket: 8
Socket (s): 1

When I runed in xsconsole -> Hardware and BIOS Information -> Processor he showed:

Logical CPU: 24
Populated CPU Sockets: 1
Total CPU Sockets: 1
Description: 1 X AMD Ryzen 9 5900x 12-Core Processor

then, I runed top, and he showed 8 cores. I thinked the cpu is broken!.

Than, I booted ubuntu server 18.04-2 on this hardware (not virtualised) and runed lscpu and he showed 24 cores.

Than I booted Windows 10 64bit (not virtualised) and showed 24 cores. With Windows runed passmark and test runed correcly.

I have other instalations of xcp in other equipements with ryzen 9 and all show 24 cores with lscpu.

I don't know what to think. I don't know who say a true

Can you helpe whit this please?

AtaxyaNetwork

@cbaguzman Hello !

Dom0 (where you probably enter the command top) is not your host, it's a VM with hardware privileges.

So it's perfectly normal to see 8 cores with the top command

You can use of course the other cores for your VMs !

cbaguzman

@AtaxyaNetwork thanks for anwer me.

I didn't know that dom0 was a other vm.

Them why in similar instalations on other equipement with Ryzen 9 5900x and xcp 8.2.1 top shows 24 cores?

Do You know?

olivierlambert

Are you sure about that? Regarding Xen's design:

Your dom0 will only have a number of CPU available (it's auto configured and depends on some rules and your hardware). As @AtaxyaNetwork said, it's perfectly normal.

cbaguzman

@olivierlambert and @AtaxyaNetwork pardon for my bad english.

Maybe I don't write clear. I hope haven't offensive to you.

Thank for your answer me.

olivierlambert

Not at all It's normal to learn. I hope we answered your questions