[dpdk-dev] Pktgen-DPDK rate and traffic inconsistency problem
Alexandre Frigon
alexandre.frigon at ericsson.com
Wed Jan 28 17:20:06 CET 2015
Hi Pawel,
Thanks for your reply.
Sadly, assigning 1 core per port didn't change anything.
As for the NUMA nodes, If I understand correctly there is a node for each socket and I'm only using 1 socket with 4 cores and lscpu is showing me only 1 node. I don't think I can do anything about that. Correct me if I'm wrong on this one.
I'm definitely going to try a older version and see if it works properly.
Thanks for your help
Alexandre F.
> -----Original Message-----
> From: Wodkowski, PawelX [mailto:pawelx.wodkowski at intel.com]
> Sent: Wednesday, January 28, 2015 9:15 AM
> To: Alexandre Frigon; dev at dpdk.org; keith.wiles at windriver.com
> Subject: RE: Pktgen-DPDK rate and traffic inconsistency problem
>
> > -----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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