[PATCH 1/1] test/pmd_perf: handling of unknown connection speed

[Ajit Khaparde]

On Sun, Jun 26, 2022 at 8:15 AM Thomas Monjalon <thomas at monjalon.net> wrote:
>
> 11/05/2022 18:33, Heinrich Schuchardt:
> > When running DPDK in QEMU it cannot determine the connection speed.
> > pmd_perf_autotest treats this as if the connection speed where
> > UNIT32_MAX Mbps:
> >
> >     RTE>>pmd_perf_autotest
> >     Start PMD RXTX cycles cost test.
> >     Allocated mbuf pool on socket 0
> >     CONFIG RXD=1024 TXD=1024
> >     Performance test runs on lcore 1 socket 0
> >     Port 0 Address:52:54:00:12:34:57
> >     Port 1 Address:52:54:00:12:34:58
> >     Checking link statuses...
> >     Port 0 Link up at Unknown FDX Autoneg
> >     Port 1 Link up at Unknown FDX Autoneg
> >     IPv4 pktlen 46
> >     UDP pktlen 26
> >     Generate 4096 packets @socket 0
> >     inject 2048 packet to port 0
> >     inject 2048 packet to port 1
> >     Total packets inject to prime ports = 4096
> >     Each port will do 6391320379464 packets per second
> >     Test will stop after at least 25565281517856 packets received
> >
> > This will not allow the test to terminate in a reasonable timespan.
> > Just assume 10 Gbps in this case instead:
> >
> >     ...
> >     Test will stop after at least 59523808 packets received
> >
> > Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
> > ---
> >  app/test/test_pmd_perf.c | 15 +++++++++++----
> >  1 file changed, 11 insertions(+), 4 deletions(-)
> >
> > diff --git a/app/test/test_pmd_perf.c b/app/test/test_pmd_perf.c
> > index 25611bfe9b..ee08c8aade 100644
> > --- a/app/test/test_pmd_perf.c
> > +++ b/app/test/test_pmd_perf.c
> > @@ -486,10 +486,17 @@ main_loop(__rte_unused void *args)
> >       }
> >       printf("Total packets inject to prime ports = %u\n", idx);
> >
> > -     packets_per_second = (link_mbps * 1000 * 1000) /
> > -             ((PACKET_SIZE + FRAME_GAP + MAC_PREAMBLE) * CHAR_BIT);
> > -     printf("Each port will do %"PRIu64" packets per second\n",
> > -            packets_per_second);
> > +     if (link_mbps != RTE_ETH_SPEED_NUM_UNKNOWN) {
> > +             packets_per_second = (link_mbps * 1000 * 1000) /
> > +                     ((PACKET_SIZE + FRAME_GAP + MAC_PREAMBLE) * CHAR_BIT);
> > +             printf("Each port will do %"PRIu64" packets per second\n",
> > +                    packets_per_second);
> > +             total_packets = RTE_TEST_DURATION * conf->nb_ports * packets_per_second;
>
> This is redundant with below.
>
> > +     } else {
> > +             /* We don't know the speed. Pretend it is 10G */
> > +             packets_per_second = ((uint64_t)RTE_ETH_SPEED_NUM_10G * 1000 * 1000) /
> > +                     ((PACKET_SIZE + FRAME_GAP + MAC_PREAMBLE) * CHAR_BIT);
> > +     }
> >
> >       total_packets = RTE_TEST_DURATION * conf->nb_ports * packets_per_second;
>
> Why not just inserting this:
>
> if (link_mbps == RTE_ETH_SPEED_NUM_UNKNOWN)
>         link_mbps = RTE_ETH_SPEED_NUM_10G;
+1
I think this is better.

>
>
>
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