Inflight value shown invalid in Event Dev Queue

[Hari Haran]

Hi Harry Haaren (Yes :) )

I have given more details below, please check this.

*Device Configuration:*
Event Dev Queue : 1
Number of ports : 3

Queue 0 depth - 32k
Port 0, 1 amd 2 : Enqueue depth 4096, Dequeue depth 128

*Cores: *
Rx core - 1
Workers cores - 2

*Port 2:*
Used in Rx core - Used to post packets from Rx core to worker cores using
event dev queue .
So port 2 used to post packets only.
API used: rte_event_enqueue_burst()

*Port 0 and 1* linked with Event Dev Q 0 to dequeue the packets. These
ports used to dequeue the packets only.
Port 0 used in Worker core 1 - Only to receive the packets from Rx core
using event dev queue
Port 1 used in worker core 2 - Only to receive the packets from Rx core
using event dev queue
API used: rte_event_dequeue_burst()

*Expected behaviour*:

Port 2 enqueue packets to event dev Q in Rx core
Port 0 and 1 dequeue packets from event dev Q in two workers

Event dev scheduler of queue 0, will schedule received packets in port 2 to
port 0 and 1.



*Problem Description:*
Port 0 - only received 4096 packets through event dev Q, after that no
packets available for this.
API used: rte_event_dequeue_burst()

Port 2 - Successfully enqueued 32k packets through event dev Q, after that
enqueue failure observed.
API used: rte_event_enqueue_burst()

Looks like, event dev queue stalled at this point.

Also why port 0 stats show inflight as 4096?


*Port 0 Stats:*  rx   0  drop 0  tx   4096   inflight 4096

*All Stats:*
Dev=0 Port=1EventDev todo-fix-name: ports 3, qids 1
rx   32768
drop 0
tx   4096
sched calls: 628945658
sched cq/qid call: 628964843
sched no IQ enq: 628926401
sched no CQ enq: 628942982
inflight 32768, credits: 0


Port 0
  rx   0  drop 0  tx   4096   inflight 4096
  Max New: 32768  Avg cycles PP: 0    Credits: 0
  Receive burst distribution:
      0:100% 1-4:0.00% 5-8:0.00% 9-12:0.00%
  rx ring used:    0 free: 4096
  cq ring used:    0 free:  128
Port 1
  rx   0  drop 0  tx   0  inflight 0
  Max New: 32768  Avg cycles PP: 0    Credits: 0
  Receive burst distribution:
      0:100%
  rx ring used:    0 free: 4096
  cq ring used:    0 free:  128
Port 2
  rx   32768  drop 0  tx   0  inflight 0
  Max New: 32768  Avg cycles PP: 0    Credits: 0
  Receive burst distribution:
      0:-nan%
  rx ring used:    0 free: 4096
  cq ring used:    0 free:  128

Queue 0 (Atomic)
  rx   32768  drop 0  tx   4096
  Per Port Stats:
    Port 0: Pkts: 4096    Flows: 1
    Port 1: Pkts: 0   Flows: 0
    Port 2: Pkts: 0   Flows: 0
    Port 3: Pkts: 0   Flows: 0
  iq 0: Used 28672

Regards,
Hariharan


On Wed, Jul 19, 2023 at 6:30 PM Van Haaren, Harry <
harry.van.haaren at intel.com> wrote:

> > From: Hari Haran <info2hariharan at gmail.com>
> > Sent: Wednesday, July 19, 2023 1:39 PM
> > To: users at dpdk.org
> > Subject: Inflight value shown invalid in Event Dev Queue
> >
> > Hi All,
>
> Hi Hari Haran,
>
> > Once packets dequeued from port 0, still inflight stats shown same as
> dequeued count.
> > After that, enqueue failure happens for port 2 from another core due to
> it reaches Max Enqueue depth .
>
> This describes what happens -> it would be helpful to know what you are
> expecting to happen.
> Would you describe what each of port 0,1,2 are actually used for, and how
> events are expected
> to flow from RX to a Port through a Queue, to another Port, until TX?
>
> Describing the expectation and then comparing that to your "problem
> description" in this email often
> leads to the root cause & solution.
>
> Keep in mind that the event/sw implementation has capacity limitations. It
> seems to be too  high in your configuration
> (inflight = 32768 is a indicator of an issue, as SW_INFLIGHT_EVENTS_TOTAL
> is 4096 in sw_evdev.h).
>
> > Port 0 Stats:
> >
> > Below case, port 0 dequeued 4096 packets and still inflight showed the
> same value.
>
> How are the events being re-enqueued?
>
> > Port 0
> >   rx   0  drop 0  tx   4096   inflight 4096
> >
> > Full Stats:
> >
> > Dev=0 Port=1EventDev todo-fix-name: ports 3, qids 1
> > rx   32768
> > drop 0
> > tx   4096
> > sched calls: 628945658
> > sched cq/qid call: 628964843
> > sched no IQ enq: 628926401
> > sched no CQ enq: 628942982
> > inflight 32768, credits: 0
> >
> > Port 0
> >   rx   0  drop 0  tx   4096   inflight 4096
> >   Max New: 32768  Avg cycles PP: 0    Credits: 0
> >   Receive burst distribution:
> >       0:100% 1-4:0.00% 5-8:0.00% 9-12:0.00%
> >   rx ring used:    0 free: 4096
> >   cq ring used:    0 free:  128
> > Port 1
> >   rx   0  drop 0  tx   0  inflight 0
> >   Max New: 32768  Avg cycles PP: 0    Credits: 0
> >   Receive burst distribution:
> >       0:100%
> >   rx ring used:    0 free: 4096
> >   cq ring used:    0 free:  128
> > Port 2
> >   rx   32768  drop 0  tx   0  inflight 0
> >   Max New: 32768  Avg cycles PP: 0    Credits: 0
> >   Receive burst distribution:
> >       0:-nan%
> >   rx ring used:    0 free: 4096
> >   cq ring used:    0 free:  128
> >
> > Queue 0 (Atomic)
> >   rx   32768  drop 0  tx   4096
> >   Per Port Stats:
> >     Port 0: Pkts: 4096    Flows: 1
> >     Port 1: Pkts: 0   Flows: 0
> >     Port 2: Pkts: 0   Flows: 0
> >     Port 3: Pkts: 0   Flows: 0
> >   iq 0: Used 28672
> > This issue will be resolved once system level restart is done.
> > Kindly give insight on this issue, if you found any clues.
> > TIA.
> >
> > Regards
> > Hariharan
>
> Regards, -Harry van Haaren (PS: our names are surprisingly similar! : )
>
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