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Date: Fri, 19 Aug 2016 11:06:07 -0700
From: Stephen Hemminger <stephen@networkplumber.org>
To: =?UTF-8?B?xJDhu5cgSG/DoG5n?= <mon120494@gmail.com>
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Subject: Re: [dpdk-users] Performance issue with 82546EB NICs
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On Fri, 19 Aug 2016 08:53:12 +0800
=C4=90=E1=BB=97 Ho=C3=A0ng <mon120494@gmail.com> wrote:

> Hi all,
>=20
> I am using a dual-port Intel 82546EB to run the simple l2fwd application
> (forward 64byte packets).
>=20
> 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.
>=20
> I have also tried to run dpdk-pktgen with this NIC and It can only genera=
te
> and send about 150Mb/s.
>=20
> My NIC link speed is 1000Mb/s. I am wondering why its performance is so
> slow like this.
>=20
> Please help me. Any ideas/advices are appreciated.
>=20
> 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.