[dpdk-dev] 10G Interface used as PCI Pass-Through reports 64bytes / packet

Bruce Richardson bruce.richardson at intel.com
Mon Jun 29 11:18:32 CEST 2015


On Fri, Jun 26, 2015 at 04:56:18PM +0000, Assaad, Sami (Sami) wrote:
> Hello,
> 
> Is it normal that a 10G NIC interface, supporting the 82599 Ethernet Controller, configured as PCI Pass-through for a virtual machine using DPDK,  reports 64 bytes per packet; no matter what the packet size?
> 
That would not be expected behaviour, no.
AFAIK, the 82599 NIC counters should behave in the same way whether or not it is passed through
to a VM or used on a host. 

> If so; I'm assuming this is to improve the performance of passing the network traffic to the VM.  Is there a way to configure the NIC to properly present the proper byte count/packet?
> 
I'm not sure what you mean here. I can't see how the reporting of byte-counts
would affect performance. Can you clarify what exactly you are seeing, and why
you think there is a performance benefit because of it?

/Bruce

> Thanks in advance.
> 
> Best Regards,
> Sami.


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