[dpdk-dev] Maximum possible throughput with the KNI DPDK Application

[Zhang, Helin]

Hi Malveeka

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Malveeka Tewari
> Sent: Thursday, September 18, 2014 6:51 AM
> To: dev at dpdk.org
> Subject: [dpdk-dev] Maximum possible throughput with the KNI DPDK
> Application
> 
> Hi all
> 
> I've been playing the with DPDK API to send out packets using the l2fwd app
> and the Kernel Network Interface app with a single Intel 82599 NIC on an Intel
> Xeon E5-2630
> 
> With the l2fwd application, I've been able to achieve 14.88 Mpps with minimum
> sized packets.
> However, running iperf with the KNI application only gives  me only ~7Gb/s
> peak throughput.

KNI is quite different from other DPDK applications, it is not for fast path forwarding. As it will pass the packets received in user space to kernel space, and possible the kernel stack. So don't expect too much higher performance. I think 7Gb/s might be a good enough data, what's your real use case of KNI?

> 
> Has anyone achieved the 10Gb/s line rate with the KNI application?
> Any help would be greatly appreciated!
> 
> Thanks!
> Malveeka

Regards,
Helin