Virtio interfaces - Trex

[Devis Reagan]

Dear Team ,

I have a virtio hardware , it exposes virtual functions . I have binded the VF to vfio-pci and using pktgen (dpdk based traffic generator) and able to send up to 45Gbps . When using trex I could see it’s not sending beyond 10Gbps , because the trex sees the interface as 10Gbps . Though the interface show as 10G , it can send more than 20G (that’s true through pktgen) . Is there a way we can make the trex to see the interface at 20G through configuration? Though the interface as such show as 10G at the kernel level . Looks it’s taking that 10G from some where while it’s starting and does not send beyond 10G 

Thanks ,

Devis Reagan

[hanoh haim]

Hi Devis, 

I assume you are referring to STL. In the past, it was limited to one core so 10gbps was chosen. On latest version there is no limitation (there is rss in software and multi-core).

There is a force field in the start command that you can use to override the limit of the port, or just change the code to support 100gbps to this interface 

Thanks

Hanoh

[Devis Reagan]

Hi Hanoh,

I will thy the force option . What do you mean by change the code ? Are you referring to change the virtio driver code or what ?

Thanks ,

Devis Reagan

[hanoh haim]

Hi Devis, this class TRexPortAttr has a function get_link_speed, just override this class and on this driver return a different fixed

with 100gbps limit.

This is the driver

https://github.com/cisco-system-traffic-generator/trex-core/blob/master/src/drivers/trex_driver_virtual.cpp#L114