[dpdk-users] 答复: How to send packet with line rate on I350-DA2, but not care rx speed

[hfli at netitest.com]

Hi Wenzhuo,

 

I found the reason, it due to “Flow Control” features of network adapter,
https://www.intel.com/content/www/us/en/support/articles/000005593/network-a
nd-i-o/ethernet-products.html, it will be send packet with line rate however
after call below function.

 

static void nova_disable_flow_control(int portid)

{

    struct rte_eth_fc_conf fc_conf;

    memset(&fc_conf, 0, sizeof(struct rte_eth_fc_conf));

 

    if (rte_eth_dev_flow_ctrl_get(portid, &fc_conf) != 0) {

        printf("Can't get flow ctrl config from port %d\n", portid);

        return;

    }

 

    if (fc_conf.mode != RTE_FC_NONE) {

        fc_conf.mode = RTE_FC_NONE;

        if (rte_eth_dev_flow_ctrl_set(portid, &fc_conf) != 0) {

           printf("Can't set flow ctrl config from port %d\n", portid);

        }

    }

 

    printf("Disable flow control on port %d ... Done\n", portid);

}

 

 

Thanks and Regards,

Haifeng

 

发件人: hfli at netitest.com <hfli at netitest.com> 
发送时间: 2019年3月8日 18:42
收件人: 'wenzhuo.lu at intel.com' <wenzhuo.lu at intel.com>
抄送: 'dev at dpdk.org' <dev at dpdk.org>; 'users at dpdk.org' <users at dpdk.org>
主题: How to send packet with line rate on I350-DA2, but not care rx speed

 

Wenzhuo,

 

>From “MAINTAINERS” file in package of dpdk source code, I know that you
maintain e1000e driver now, could you help me for an question?

 

I use DPDK-pktgen based on Intel I350-DA2 network adapters, when I loopback
two ports on one NIC(I350_eth1 <-> I350_eth2), I got 1Gbps line rate TX
throughput.

 

But when I link a Firewall between two ports, just like I350_eth1 ->
Firewall_port1 -> Firewall_port2 -> I350_eth2, even I try to burst tx
throughput as line rate by power CPU cores, it only get 600Mbps tx
throughput which is firewall’s rx speed, seem the tx speed from I350 just
depend on peer firewall rx capability.

 

I try this on others network adapters like X520-DA2 and X710DA2, both of
them got different results, tx speed only depend on CPU power, but no
related with rx capability of network devices.

 

Could you know why of this? Is there any configuration/interface/register
update this feature? Let us send packet with line rate, but not care rx
speed.   

 

/ # lspci | grep I350

0e:00.0 Ethernet controller: Intel Corporation I350 Gigabit Network
Connection (rev 01)

0e:00.1 Ethernet controller: Intel Corporation I350 Gigabit Network
Connection (rev 01)

/ #

 

Thanks and Regards,

Haifeng