[dpdk-users] DPDK application fails to start in KVM

[dpdk-users] DPDK application fails to start in KVM

[Jatin Sahu]

Hi,

I was using the DPDK library in a VM environment. But during the
application startup, the RTE initialization fails with the following error.

Is there any limitation of using DPDK libraries with KVM.

VM Details:
[roamware@roamware ~]$ hostnamectl
   Static hostname: localhost.localdomain
Transient hostname: roamware.com
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 1ef1544480eb44a89d5b1f9eb8a8832f
           Boot ID: 282f8207b643405a89d13ea6d896745c
    Virtualization: kvm
  Operating System: Red Hat Enterprise Linux Server 7.2 (Maipo)
       CPE OS Name: cpe:/o:redhat:enterprise_linux:7.2:GA:server
            Kernel: Linux 3.10.0-327.el7.x86_64
      Architecture: x86-64

Error details:
ERROR: This system does not support "RDRAND".
Please check that RTE_MACHINE is set correctly.
EAL: FATAL: unsupported cpu type.
EAL: unsupported cpu type.

Regards,
Jatin

Re: [dpdk-users] DPDK application fails to start in KVM

[David Christensen]

On 8/25/20 10:02 AM, Jatin Sahu wrote:
> Error details:
> ERROR: This system does not support "RDRAND".
> Please check that RTE_MACHINE is set correctly.
> EAL: FATAL: unsupported cpu type.
> EAL: unsupported cpu type.

RDRAND is an x86 CPU instruction (https://en.wikipedia.org/wiki/RDRAND).
Your problem is likely related to the CPU type you selected for your VM. 
Try running "lscpu | grep rdrand" in your VM.  On my VM with "Common KVM 
processor" the RDRAND flag is not available.

Dave