Re: [dpdk-dev] Unable to get RSS to work in testpmd and load balancing question

[Michael Quicquaro <michael.quicquaro@gmail.com>]

Why are there so many RX-errors?


On Thu, Jan 9, 2014 at 9:35 PM, Daniel Kan <dan@nyansa.com> wrote:

> Thanks, Sy Jong. I couldn’t reproduce your outcome on dpdk 1.5.1 with
> ixgbe. As I sent in the earlier email, rxmode.mq_mode is defaulted to 0
> (i.e. ETH_MQ_RX_NONE); it should be set to ETH_MQ_RX_RSS.
>
> Dan
>
> On Jan 9, 2014, at 6:07 PM, Choi, Sy Jong <sy.jong.choi@intel.com> wrote:
>
> >
> > Hi Dan,
> >
> > I have tested with 6 flows with identical ip address, but varies UDP
> port number. I can see both queues with traffic.
> > Using the following command:-
> > sudo ./app/testpmd -c 0x1f -n 4 -- -i -rss-udp --portmask=0x03
> --nb-cores=4 --rxq=2 --txq=2
> >
> >
> > I have started with RSS IPv4, which is enabled by default.
> > The critical part is the traffic, since I only 2 queues, I am sending 6
> flows with different IP addresses in order to see the flow got distributed
> evenly. Or else you might see only 1 queues if you have 2 flows they might
> load to a single queue only.
> >
> > My Command:-
> > sudo ./app/testpmd -c 0x1f -n 4 -- -i --portmask=0x03 --nb-cores=4
> --rxq=2 --txq=2
> > -     Using 4 cores
> > -     Rxq = 2 for each port, so 4 queues to 4 cores.
> >
> >
> >
> > testpmd> show port stats all
> >
> >   ######################## NIC statistics for port 0
>  ########################
> >   RX-packets:              6306519648    RX-errors:  757945685
>  RX-bytes: 309383840254
> >   TX-packets:               132592678    TX-errors:          0
>  TX-bytes: 8485925376
> >
> >   Stats reg  0 RX-packets: 2556150208    RX-errors:          0
>  RX-bytes: 116477417471
> >   Stats reg  1 RX-packets: 3750369440    RX-errors:          0
>  RX-bytes: 192906422783
> >   Stats reg  2 RX-packets:          0    RX-errors:          0
>  RX-bytes:          0
> > .
> > .
> > .
> >   Stats reg 15 RX-packets:          0    RX-errors:          0
>  RX-bytes:          0
> >
> ############################################################################
> >
> >   ######################## NIC statistics for port 1
>  ########################
> >   RX-packets:               132594048    RX-errors:   13825889
>  RX-bytes: 8486020288
> >   TX-packets:              6306522739    TX-errors:          0
>  TX-bytes: 231983528894
> >
> >   Stats reg  0 RX-packets:   83615783    RX-errors:          0
>  RX-bytes: 5351410624
> >   Stats reg  1 RX-packets:   48978265    RX-errors:          0
>  RX-bytes: 3134609664
> >   Stats reg  2 RX-packets:          0    RX-errors:          0
>  RX-bytes:          0
> > .
> > .
> > .
> >   Stats reg 15 RX-packets:          0    RX-errors:          0
>  RX-bytes:          0
> >
> ############################################################################
> > testpmd>
> >
> >
> >
> >
> > My Command:-
> > sudo ./app/testpmd -c 0x1f -n 4 -- -i --portmask=0x03 --nb-cores=4
> --rxq=2 --txq=2
> > - Using 4 cores
> > - Rxq = 2 for each port, so 4 queues to 4 cores.
> >
> > I use this command to map the queue statistic.
> > testpmd> set stat_qmap rx 0 0 0
> > testpmd> set stat_qmap rx 0 1 1
> > testpmd> set stat_qmap rx 1 0 0
> > testpmd> set stat_qmap rx 1 1 1
> > testpmd> start
> >   io packet forwarding - CRC stripping disabled - packets/burst=16
> >   nb forwarding cores=2 - nb forwarding ports=2
> >   RX queues=2 - RX desc=128 - RX free threshold=0
> >   RX threshold registers: pthresh=8 hthresh=8 wthresh=4
> >   TX queues=2 - TX desc=512 - TX free threshold=0
> >   TX threshold registers: pthresh=36 hthresh=0 wthresh=0
> >   TX RS bit threshold=0 - TXQ flags=0x0
> >
> > testpmd> show port stats all
> >
> >
> >
> > Regards,
> > Choi, Sy Jong
> > Platform Application Engineer
> >
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Dan Kan
> > Sent: Wednesday, January 08, 2014 3:25 PM
> > To: dev@dpdk.org
> > Subject: [dpdk-dev] Unable to get RSS to work in testpmd and load
> balancing question
> >
> > I'm evaluating DPDK using dpdk-1.5.1r1. I have been playing around with
> the test-pmd sample app. I'm having a hard time to get RSS to work. I have
> a 2-port 82599 Intel X540-DA2 NIC. I'm running the following command to
> start the app.
> >
> > sudo ./testpmd -c 0x1f -n 2 -- -i --portmask=0x3 --nb-cores=4 --rxq=4
> > --txq=4
> >
> > I have a packet generator that sends udp packets with various src IP.
> > According testpmd, I'm only receiving packets in port 0's queue 0.
> Packets are not going into any other queues. I have attached the output
> from testpmd.
> >
> >
> >  ------- Forward Stats for RX Port= 0/Queue= 0 -> TX Port= 1/Queue= 0
> > -------
> >  RX-packets: 1000000        TX-packets: 1000000        TX-dropped:
> > 0
> >  ---------------------- Forward statistics for port 0
> > ----------------------
> >  RX-packets: 1000000        RX-dropped: 0             RX-total: 1000000
> >  TX-packets: 0              TX-dropped: 0             TX-total: 0
> >
> >
> ----------------------------------------------------------------------------
> >
> >  ---------------------- Forward statistics for port 1
> > ----------------------
> >  RX-packets: 0              RX-dropped: 0             RX-total: 0
> >  TX-packets: 1000000        TX-dropped: 0             TX-total: 1000000
> >
> >
> ----------------------------------------------------------------------------
> >
> >  +++++++++++++++ Accumulated forward statistics for all
> > ports+++++++++++++++
> >  RX-packets: 1000000        RX-dropped: 0             RX-total: 1000000
> >  TX-packets: 1000000        TX-dropped: 0             TX-total: 1000000
> >
> >
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >
> > On a separate note, I also find that the CPU utilization using 1
> forwarding core for 2 ports seems to be better (in the aggregate sense)
> than using 2 forwarding cores for 2 ports. Running at 10gbps line rate of
> pktlen=400, with 1 core, the core's utilization is 40%. With 2 cores, each
> core's utilization would 30%, giving an aggregate of 60%.
> >
> > I have a use case of only doing rxonly packet processing. From my
> initial test, it seems that it's more efficient to have a single core read
> packets from both ports, and distribute the packet using rte_ring instead
> of having each core read from its port. The rte_eth_rx operations appear to
> be much CPU intensive than rte_ring_dequeue operations.
> >
> > Thanks in advance.
> >
> > Dan
> >
>
>