[dpdk-dev] Pktgen-DPDK rate and traffic inconsistency problem
Wodkowski, PawelX
pawelx.wodkowski at intel.com
Wed Jan 28 15:14:38 CET 2015
> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Alexandre Frigon
> Sent: Tuesday, January 27, 2015 8:31 PM
> To: dev at dpdk.org
> Subject: [dpdk-dev] Pktgen-DPDK rate and traffic inconsistency problem
>
> Hi all,
>
> I'm using dpdk 1.8 and pktgen-dpdk 2.8 to generate traffic on a back-to-back
> setup both equipped with 82599EB 10-Gigabit NIC.
> The problem is when I start it, pktgen indicates 10000Mbits/s Tx with 64B packet
> size, but I'm receiving about 15% of it on the other end.
> This percentage seems to be proportional with the packet size.
>
> e.g.
> Using nload to read Rx traffic
> Pktgen: Tx: 10000Mbits/s ==> Other end: Rx 1660 Mbits/s
> Rate: 100%
> Pkt size: 64B
>
>
> e.g 2
> Pktgen: Tx: 10000Mbits/s ==> Other end: Rx 9385 Mbits/s
> Rate: 100%
> Pkt size: 1518B
>
>
> Pktgen is started with this command on a Xeon(R) CPU E31270 @ 3.40GHz
> ./app/pktgen -c 1f -n 3 --proc-type auto --socket-mem 1024 --file-prefix pg -- -p
> 0x3 -P -N -m "[1:3].0, [2:4].1"
>From past experience I don't assign more than 1 core per port. It had some
race conditions issues and one core I capable to RX or TX full 10G.
Also check if you assign proper cores/memory for your NICs (the same
NUMA node).
>
> Is there something I'm not configuring correctly or something I have miss?
>
> Also, the % rate is acting strangely since anything above 50% doesn't change
> the Tx rate and anything below is modifying it
> e.g Tx: 10000Mbits/s 5000Mbits/s
> %Rate: >=50% 25%
>
>
Actually I am getting exactly opposite results :)
If I set rate to 50% I get
MBits/s Rx/Tx : 0/9942 9942/0 9942/9942
For 10%:
MBits/s Rx/Tx : 0/1997 1997/0 1997/1997
Which is about 2x set :D
Additionaly I am getting message when "start 0" -> "stop 0" -> "start 0" is issued
PMD: ixgbe_dev_rx_init(): forcing scatter mode
So there is definitely something wrong there but don't know where.
Another issue I encountered is build system that fail when building out-of-tree.
Till this is fixed you can try version 2.7.1 that is working for me.
Pawel
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