[dpdk-users] Any way to get more that 40Mpps with 64bytes using a XL710 40Gb nic

[Mauricio Valdueza]

Hi Guys

Max theoretical value is 56.8 Mpps… but practical PCie limitations allow us to reach 42Mpps

I am reaching 36Mpps, so where are the 6Mpps lost ( ?

Mau

On 29/09/2017, 06:22, "Wiles, Keith" <keith.wiles at intel.com> wrote:

    
    > On Sep 28, 2017, at 9:40 PM, Andrew Theurer <atheurer at redhat.com> wrote:
    > 
    > In our tests, ~36Mpps is the maximum we can get.  We usually run a test with TRex, bidirectional, 2 pci cards, 1 port per x8 gen3 PCI adapter, with a device under test using same HW config but running testomd with 2 or more queues per port.  Bidirectional aggregate traffic is in the 72Mpps range.  So, in that test, each active port is transmitting and receiving ~36Mpps, however, I don't believe the received packets are DMA'd to memory, just counted on the adapter.  I have never observed the Fortville doing higher than that.  
    
    40Gbits is the limit and I think 36Mpps is the MAX for the PCI I think, if I remember correctly. The t-rex must be counting differently as you stated. I need to ask some folks here.
    
    I have two 40G NICs, but at this time I do not have enough slots to put in the other 40 and keep my 10Gs in the system.
    
    I need to fix the problem below, but have not had the chance.
    
    > 
    > -Andrew
    > 
    > On Thu, Sep 28, 2017 at 3:59 PM, Wiles, Keith <keith.wiles at intel.com> wrote:
    > 
    > > On Sep 28, 2017, at 6:06 AM, Mauricio Valdueza <mvaldueza at vmware.com> wrote:
    > >
    > > Hi Guys;
    > >
    > > I am testing a Fortville 40Gb nic with PKTgen
    > >
    > > I see linerate in 40Gb with 156B packet size, but once I decrease size, linerate is far away
    > 
    > In Pktgen the packet count is taken from the hardware registers on the NIC and the bit rate is calculated using those values. Not all NICs flush the TX done queue and from one start command to the next the numbers can be off as the old packets are being recycled with the new size packets. Please try the different sizes and bring down pktgen between runs just to see if that is the problem.
    > 
    > >
    > > WITH 158B
    > > Link State        :       <UP-40000-FD>     ----TotalRate----
    > > Pkts/s Max/Rx     :                 0/0                   0/0
    > >     Max/Tx     :   28090480/28089840     28090480/28089840
    > > MBits/s Rx/Tx     :             0/40000               0/40000
    > > -----------------------------------------------------------------------------------------------
    > >
    > > WITH 128B
    > > Link State        :       <UP-40000-FD>     ----TotalRate----
    > > Pkts/s Max/Rx     :                 0/0                   0/0
    > >     Max/Tx     :   33784179/33783908     33784179/33783908
    > > MBits/s Rx/Tx     :             0/40000               0/40000
    > > ------------------------------------------------------------------------------------------------
    > >
    > > With 64B
    > > Link State        :       <UP-40000-FD>     ----TotalRate----
    > > Pkts/s Max/Rx     :                 0/0                   0/0
    > >     Max/Tx     :   35944587/35941680     35944587/35941680
    > > MBits/s Rx/Tx     :             0/24152               0/24152
    > > ----------------------------------------------------------------------------------------------
    > >
    > > Should I run any optimization?
    > >
    > > My environment is:
    > >
    > > •VMware ESXi version:           6.5.0, 4887370
    > > •Exact NIC version:                 Intel Corporation XL710 for 40GbE QSFP+
    > > •NIC driver version:                i40en version 1.3.1
    > > •Server Vendor:                      Dell
    > > •Server Make:                        Dell Inc. PowerEdge R730
    > > •CPU Model:  I                        ntel(R) Xeon(R) CPU E5-2697 v3 @ 2.60GHz
    > > •Huge pages size:                   2M
    > > •Test VM: What is it?             Ubuntu 16.04
    > > • DPDK is compiled there?     dpdk-17.08
    > > •Test traffic kind: IP/UDP?     Both tested
    > > Traffic generator: Intel pktgen version?  pktgen-3.4.1
    > >
    > >
    > > I am executing:
    > >
    > > sudo ./app/x86_64-native-linuxapp-gcc/pktgen -c 0xff n 3 --proc-type auto --socket-mem 9096 -- -m "[1:2-7].0"  --crc-strip
    > >
    > >
    > > Thanks in advance
    > >
    > >
    > > mauricio
    > >
    > 
    > Regards,
    > Keith
    > 
    > 
    
    Regards,
    Keith