Re: [dpdk-dev] Intel I350 fails to work with DPDK

[sabu kurian <sabu2kurian@gmail.com>]

Hai bruce,


I changed the burst size to 16. The code crafts 54 byte TCP packets. It
sends a few packets and shows a segmentation fault.

Below is the portion of the code that sends the packet.

ret = rte_eth_tx_burst(1, 0, m_pool, burst_size);


                if (ret < 16)
                {
                    for(i=(int)burst_size-ret;i<(int)burst_size;i++)

                    {
                    rte_pktmbuf_free(m_pool[i]);
                    printf("\n Packet dropped %d",i);
                    }

                }
                else
                {

                    lcore_stats[lcore_id].tx += (uint64_t)burst_size;
                }

The above code is being run inside an infinite for loop.
m_pool is an array (size 16) of mbuf's allocated using rte_pktmbuf_alloc.

I'm trying to achieve maximum transfer rate. Is there any other way to do
this with Intel DPDK or am I missing something ?
The code works perfectly inside a virtual machine (VMWare) with emulated
NIC's, but as expected the host kernel drops 99% of the packets.

I'm using Intel® Core™ i7-3770 CPU @ 3.40GHz



On Wed, May 28, 2014 at 4:48 PM, Richardson, Bruce <
bruce.richardson@intel.com> wrote:

>
> > From: sabu kurian [mailto:sabu2kurian@gmail.com]
> > Sent: Wednesday, May 28, 2014 11:54 AM
> > To: Richardson, Bruce
> > Cc: dev@dpdk.org
> > Subject: Re: [dpdk-dev] Intel I350 fails to work with DPDK
> >
> > Hai bruce,
> > Thanks for the reply.
> > I even tried that before. Having a burst size of 64 or 128 simply fails.
> The card would send out a few packets
> > (some 400 packets of 74 byte size) and then freeze. For my
> application... I'm trying to generate the peak
> > traffic possible with the link speed and the NIC.
>
> Bursts of 64 and 128 are rather large, can you perhaps try using bursts of
> 16 and 32 and see what the result is? The drivers are generally tuned for a
> max burst size of about 32 packets.
>
>