[Xen-users] Xen 4.6 and Intel MKL Linpack behaviour

[Marko Đukić <marko.djukic@xxxxxxxxx>]

Hello!

I am doing some testing with Xen by running some benchmarking software inside a virtual machine. I have set up a VM with 4 vCPUs, the host hardware has 1 CPU with 4 cores. Both host and guest are running ubuntu server 16.04.

When running Intel MKL Linpack (https://software.intel.com/en-us/articles/intel-mkl-benchmarks-suite) inside a PVH or PV guest Linpack only detects 1 CPU with 1 core (output at the start of the program). If I change the guest configuration to HVM, Linpack detects 1 CPU with 4 cores.

Is this a bug in PV/PVH mode or am I missing a configuration setting?

The configuration file for PV guest is as follows:

name = "ubuntu64"

bootloader = "/usr/lib/bin/xen-4.6/bin/pygrub"

memory = 8192

vcpus = 4

vif = ['script=vif-bridge,bridge=br0']

disk = ['tap:aio:/home/vm/xen_ubuntu16.04_amd64.raw,xvda,w' ]

For PVH guest just pvh = 1 is added.

Regards

Marko

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