[dpdk-users] Peformance troubleshouting of TCP/IP stack over DPDK.

[Pavel Vajarov]

>
> I am curious how you get F-Stack working with KVM VM with SR-IOV. The
> author of F-Stack mentioned F-Stack not tested working for KVM VM. I had
> an issue report here: https://github.com/F-Stack/f-stack/issues/489


Hi there,

I asked our admin who setup the KVM for the tests.
He said that this parameter has been given to the QEMU:
 -device vfio-pci,host=af:00.2,id=hostdev0,bus=pci.0,addr=0x9

This is how the device configuration looks in the XML:
<hostdev mode='subsystem' type='pci' managed='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0xaf' slot='0x00' function='0x2'/>
      </source>
      <alias name='hostdev0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x09'
function='0x0'/>
    </hostdev>

Here is how the things are seen from the guest machine:
00:03.0 Ethernet controller: Red Hat, Inc. Virtio network device    <-----
This device is used for SSH access to the server
00:09.0 Ethernet controller: Intel Corporation Ethernet Controller X710 for
10GbE SFP+ (rev 02)   <------ This is the 10Gpbs card used for the tests.

Network devices using DPDK-compatible driver
============================================
0000:00:09.0 'Ethernet Controller X710 for 10GbE SFP+ 1572' drv=igb_uio
unused=i40e

Network devices using kernel driver
===================================
0000:00:03.0 'Virtio network device 1000' if=ens3 drv=virtio-pci
unused=igb_uio *Active*

Hope that helps.

Regards,
Pavel.