[dpdk-users] testpmd and jumbo frames

Rami Rosen roszenrami at gmail.com
Tue Feb 26 14:09:53 CET 2019


Hi, Filip
I believe that the --max-pkt-len=9600 has an effect of setting the
DEV_RX_OFFLOAD_JUMBO_FRAME flag, and not setting the mbuf seg size. If
you want to set
the mbuf segment size, you need to use the "--mbuf-size" testpmd parameter.
For example, add "--mbuf-size=10000" and then try "set txpkts 9036"
from the testpmd cli

Regards,
Rami Rosen

On Tue, 26 Feb 2019 at 08:49, Filip Janiszewski
<contact at filipjaniszewski.com> wrote:
>
> Hi,
>
> Can someone suggest the proper configuration required to test jumbo
> frames along with scatter mode using testpmd?
>
> I'm running the tool as follow:
>
> .
> sudo ./testpmd -l 0-3 -n 4 -- -i --max-pkt-len=9600 --enable-scatter
> --txd=512 --rxd=512 --forward-mode=flowgen
> .
>
> then attempting to set the packet length:
>
> .
> testpmd> set txpkts 9036
> length[0]=9036 > mbuf_data_size=2176 - give up
> .
>
> According to the documentation
> (https://doc.dpdk.org/guides/testpmd_app_ug/run_app.html), the option
> txpkts should configure:
>
> .
> Set TX segment sizes or total packet length. Valid for tx-only and
> flowgen forwarding modes.
> .
>
> So I was expecting to be able to set the packet length in this way, but
> somehow it doesn't work and when I hit start the packets have always a
> length of 60 bytes:
>
> .
>  src=00:01:02:03:04:00 - dst=00:01:02:03:04:01 - type=0x0800 - length=60
> - nb_segs=1 - hw ptype: L2_ETHER L3_IPV4_EXT_UNKNOWN L4_UDP  - sw ptype:
> L2_ETHER L3_IPV4 L4_UDP  - l2_len=14 - l3_len=20 - l4_len=8 - Send queue=0x0
> .
>
> I've attempted to set the queue capabilities (scatter and JF) by hand with:
>
> .
> testpmd> port config 1 rx_offload scatter on
> testpmd> port config 1 rx_offload jumbo_frame on
> .
>
> (repeated for both port) but this doesn't helped, so, how do I test a
> card using testpmd with packets bigger than 2176?
>
> Thanks
>
> --
> BR, Filip
> +48 666 369 823


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