[dpdk-users] Performance issue with 82546EB NICs

[Stephen Hemminger]

On Fri, 19 Aug 2016 08:53:12 +0800
Đỗ Hoàng <mon120494 at gmail.com> wrote:

> Hi all,
> 
> I am using a dual-port Intel 82546EB to run the simple l2fwd application
> (forward 64byte packets).
> 
> The result is terrible. My packet generator generates and sends about
> 320Mb/s, but nearly a half of them are dropped, and only about 160Mb of
> packets are forwarded every sec.
> 
> I have also tried to run dpdk-pktgen with this NIC and It can only generate
> and send about 150Mb/s.
> 
> My NIC link speed is 1000Mb/s. I am wondering why its performance is so
> slow like this.
> 
> Please help me. Any ideas/advices are appreciated.
> 
> Thanks.

The first thing I would check is that ethernet flow control is disabled.
Unless you are running on very slow hardware, the DPDK can saturate a 10G
link with small packets.