Re: [Qemu-discuss] CPU low load problem

[Francois Pussault]

Hello

looks like your stress test " single thread CPU" is running 1/28 100% vcpu so on host it cannot be more than qemu other stuff and added vmachines cpu usage.

If you wanna make a stress test that impact the host CPU load with many-vcpu machines you must use a multithreaded stress test.

This is just a reading/wanted result problem not a technical one

(If I understand well your needs).

address@hidden wrote:

hi,all

In a X3850 x6 IBM server(4sockets,14cores/socket, Xeon E7-4820 v4), running on the rhel6.4 virtual machine (qemu-kvm), and occasionally there will be problems, the problem is:

with a 28 vcpu virtual machine as an example:

Running sysben in the virtual machine to do a single thread CPU stress testing, in the virtual machine will see this process takes up 100%cpu, but in the host physical machine to see the QEMU process takes up 3% of the cpu.

Running in the virtual machine inside the two sysben test, in the virtual machine will see the two processes each occupy 100%cpu, but in the host physical machine to see the QEMU process takes up 6% of the cpu.

We tested it on centos7.2. Do you have any solution ?

thanks.

Cordialement
Francois Pussault
10 chemin de négo saoumos
apt 202 - bat 2
31300 Toulouse
+33 6 17 230 820
address@hidden