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 <[email protected]> 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
