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From: zhilong zheng <zhengzl0715@gmail.com>
To: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Cc: users@dpdk.org
Subject: Re: [dpdk-users] low Tx throughputs in DPDK with Mellanox ConnectX-3 card
Date: Tue, 25 Jul 2017 21:20:38 +0800	[thread overview]
Message-ID: <468DB57F-35C6-4499-8D66-6179B530F275@gmail.com> (raw)
In-Reply-To: <20170724182026.GI19852@6wind.com>

Hi Adrien,

Thanks for your reply and suggestion. I change the packet size to 128B, it can generate ~34Gbps and ~40Gbps while to 256B and larger.

Regards,
Zhilong

> 在 2017年7月25日,02:20,Adrien Mazarguil <adrien.mazarguil@6wind.com> 写道:
> 
> Hi Zhilong,
> 
> On Sat, Jul 22, 2017 at 12:05:51AM +0800, zhilong zheng wrote:
>> Hi all,
>> 
>> I have some problem when generating packets to the Mellanox ConnectX-3 dual 40G ports card from the latest pktgen-dpdk.
>> 
>> The problem is that it can only generate ~22Gbps per port (actually I just use one port.), not saturating the 40G port. This server has two 12-cores E5-2650 v4 @2.20GHz cpus and 128G 2400MHz DDR4 memory. The DPDK version is 16.11.
>> 
>> This is the driver bound to the NIC:   0000:81:00.0 'MT27500 Family [ConnectX-3]' if=p6p1,p6p2 drv=mlx4_core unused=
>> I guess that it’s the problem of driver. The document shows the driver name should be librte_pmd_mlx4 (url: http://dpdk.org/doc/guides/nics/mlx4.html <http://dpdk.org/doc/guides/nics/mlx4.html>), however when completing installation, it’s bound to mlx4_core.
> 
> It's OK, mlx4_core is the name of the kernel driver while librte_pmd_mlx4 is
> that of the DPDK driver. There is no librte_pmd_mlx4 kernel module, see
> blurb about prerequisites [1].
> 
>> Any clue about this problem? And whether it’s caused by the driver or others?
> 
> Depending on packet size and other configuration settings, you may have hit
> the maximum packet rate, these devices cannot reach line rate with 64-byte
> packets for instance.
> 
> [1] http://dpdk.org/doc/guides/nics/mlx4.html#prerequisites
> 
> -- 
> Adrien Mazarguil
> 6WIND

  reply	other threads:[~2017-07-25 13:20 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-21 16:05 zhilong zheng
2017-07-24 18:20 ` Adrien Mazarguil
2017-07-25 13:20   ` zhilong zheng [this message]
2017-07-25 14:06     ` Adrien Mazarguil

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