[dpdk-users] pktgen-dpdk runts when start size is 64

Wiles, Keith keith.wiles at intel.com
Thu Nov 8 14:48:43 CET 2018



> On Nov 8, 2018, at 2:12 AM, Bichan.Lu <Bichan.Lu at advantech.com.tw> wrote:
> 
> Hi,
> 
> OS: CentOS 7.5.1804
> Pktgen version: pktgen-3.5.8
> DPDK verison: dpdk-18.08
> 
> I use the pktgen in follows command. When I start pktgen, default PktSize is 64, in the command I sad:
> 
> ./pktgen -l 0-4 -n 3 -- -P -m "[1:3].0,[2:4].1"
> Pktgen:/> start all
> 
> Link State        :        <UP-1000-FD>        <UP-1000-FD>     ----TotalRate----
> Pkts/s Max/Rx     :     1487853/1487844     1491609/1491602       2979462/2979446
>       Max/Tx     :     1491607/1491606     1487855/1487841       2979459/2979447
> MBits/s Rx/Tx     :            999/1002            1002/999             2002/2002
> Broadcast         :                   0                   0
> Multicast         :                   0                   0
>  64 Bytes        :                   0                   0
>  65-127          :                   0                   0
>  128-255         :                   0                   0
>  256-511         :                   0                   0
>  512-1023        :                   0                   0
>  1024-1518       :                   0                   0
> Runts/Jumbos      :           8889515/0           8913610/0
> Errors Rx/Tx      :                 0/0                 0/0
> ......< shown parts of pktgen >.....
> 
> Then will be get Runts.
> I tried when size is 68, range will be in [64 Bytes], and no runts.
> Pktgen:/> set 0 size 68
> Pktgen:/> set 1 size 68
> Pktgen:/> start all
> 

What is the hardware NIC as most of the hardware appends the FCS?

Pktgen expects the NIC to append the FCS and there is a flag to disable that feature?

> I guess it may related about range, could help to check?
> Thanks.
> 
> Best regards,
> Bichan.Lu

Regards,
Keith



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