On 4/3/19, 12:02 PM, "Mattias Rönnblom" <mattias.ronnb...@ericsson.com> wrote:
On 2019-04-03 20:36, Venky Venkatesh wrote:
>
>
> On 4/3/19, 11:34 AM, "Mattias Rönnblom" <mattias.ronnb...@ericsson.com>
wrote:
>
> On 2019-04-03 20:17, Venky Venkatesh wrote:
> > Hi,
> > I am using the DSW code from 18.11 with the default settings for
all the #defines. Here are some more details:
> > I have an 8 port system with 1 queue.
> > All ports can inject events. Port 0 and 7 inject events rarely.
> > Ports 1-6 are linked to the queue and hence dequeue events.
> >
> > I see that in steady state the total number enqueues into the
system is much greater than the total number of dequeues.
> > eventdev deq#: 1948491 enq#: 1949007
> >
>
> If you have more enqueues than dequeues, it means there are events in
> flight in the scheduler. In the above case, it's roughly 516 events,
> which sounds perfectly healthy and normal. I say roughly, because
> there's no way to take a consistent, global snapshot of all xstats
counters.
>
> [VV]: This is in steady state i.e. there are no more events being
injected into the system. So shouldn’t everything get drained out at some point?
>
Assuming appropriate application behavior, sure, of course.
Events in flight are either in the output buffer on the producer port,
or the input ring on the consumer.
Inappropriate behavior would be if any port (producer, consumer or
producer+consumer) is left unattended (i.e. no enqueue or dequeue
operation is performed).
[VV]: I am pasting the original data again below. If about 516 events are
inflight, atleast a few should show up in one of the data structures that you
refer to -- but they don’t as seen below. Isn't that odd? Do you have any other
places I can look -- there were no migrations too to look at some other
transient buffers.
Below are the counters:
[root@PA-VM-venky ~]# cat y
dev_credits_on_loan: 883
------ port 0 --------
port_0_new_enqueued: 125
port_0_forward_enqueued: 0
port_0_release_enqueued: 0
port_0_queue_0_enqueued: 125
port_0_dequeued: 0
port_0_queue_0_dequeued: 0
port_0_migrations: 0
port_0_migration_latency: 0
port_0_event_proc_latency: 0
port_0_inflight_credits: 3
port_0_load: 49
port_0_last_bg: 39368511869708
------ port 1 --------
port_1_new_enqueued: 138947
port_1_forward_enqueued: 237896
port_1_release_enqueued: 0
port_1_queue_0_enqueued: 376843
port_1_dequeued: 475778
port_1_queue_0_dequeued: 475778
port_1_migrations: 0
port_1_migration_latency: 0
port_1_event_proc_latency: 119069
port_1_inflight_credits: 13
port_1_load: 0
port_1_last_bg: 77183632541672
------ port 2 --------
port_2_new_enqueued: 88834
port_2_forward_enqueued: 156687
port_2_release_enqueued: 0
port_2_queue_0_enqueued: 245521
port_2_dequeued: 313358
port_2_queue_0_dequeued: 313358
port_2_migrations: 0
port_2_migration_latency: 0
port_2_event_proc_latency: 176184
port_2_inflight_credits: 15
port_2_load: 0
port_2_last_bg: 77183632941696
------ port 3 --------
port_3_new_enqueued: 73170
port_3_forward_enqueued: 78087
port_3_release_enqueued: 0
port_3_queue_0_enqueued: 151257
port_3_dequeued: 165317
port_3_queue_0_dequeued: 165317
port_3_migrations: 0
port_3_migration_latency: 0
port_3_event_proc_latency: 329601
port_3_inflight_credits: 66
port_3_load: 0
port_3_last_bg: 77183632966910
------ port 4 --------
port_4_new_enqueued: 93182
port_4_forward_enqueued: 76422
port_4_release_enqueued: 0
port_4_queue_0_enqueued: 169604
port_4_dequeued: 207721
port_4_queue_0_dequeued: 207721
port_4_migrations: 0
port_4_migration_latency: 0
port_4_event_proc_latency: 262259
port_4_inflight_credits: 114
port_4_load: 0
port_4_last_bg: 77183632760588
------ port 5 --------
port_5_new_enqueued: 144855
port_5_forward_enqueued: 630897
port_5_release_enqueued: 0
port_5_queue_0_enqueued: 775752
port_5_dequeued: 633700
port_5_queue_0_dequeued: 633700
port_5_migrations: 0
port_5_migration_latency: 0
port_5_event_proc_latency: 88203
port_5_inflight_credits: 64
port_5_load: 0
port_5_last_bg: 77183632277448
------ port 6 --------
port_6_new_enqueued: 153590
port_6_forward_enqueued: 76315
port_6_release_enqueued: 0
port_6_queue_0_enqueued: 229905
port_6_dequeued: 152617
port_6_queue_0_dequeued: 152617
port_6_migrations: 0
port_6_migration_latency: 0
port_6_event_proc_latency: 354408
port_6_inflight_credits: 92
port_6_load: 0
port_6_last_bg: 77183632653092
------ port 7 --------
port_7_new_enqueued: 0
port_7_forward_enqueued: 0
port_7_release_enqueued: 0
port_7_queue_0_enqueued: 0
port_7_dequeued: 0
port_7_queue_0_dequeued: 0
port_7_migrations: 0
port_7_migration_latency: 0
port_7_event_proc_latency: 0
port_7_inflight_credits: 0
port_7_load: 0
Below are the data structure values:
(gdb) p ((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[0]->out_buffer_len
$2 = {0 <repeats 64 times>}
(gdb) p ((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[1]->out_buffer_len
$3 = {0 <repeats 64 times>}
(gdb) p ((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[2]->out_buffer_len
$4 = {0 <repeats 64 times>}
(gdb) p ((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[3]->out_buffer_len
$5 = {0 <repeats 64 times>}
(gdb) p ((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[4]->out_buffer_len
$6 = {0 <repeats 64 times>}
(gdb) p ((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[5]->out_buffer_len
$7 = {0 <repeats 64 times>}
(gdb) p ((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[6]->out_buffer_len
$8 = {0 <repeats 64 times>}
(gdb) p ((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[7]->out_buffer_len
$9 = {0 <repeats 64 times>}
(gdb) p *((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[0]->in_ring
$10 = {r = {name = "dsw0_p0", '\000' <repeats 24 times>, flags = 6, memzone =
0xc000000090, size = 32768, mask = 32767, capacity = 16384, pad0 = 0 '\000',
prod = {head = 0, tail = 0,
single = 0}, pad1 = 0 '\000', cons = {head = 0, tail = 0, single = 1},
pad2 = 0 '\000'}}
(gdb) p *((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[1]->in_ring
$11 = {r = {name = "dsw0_p1", '\000' <repeats 24 times>, flags = 6, memzone =
0xc000000120, size = 32768, mask = 32767, capacity = 16384, pad0 = 0 '\000',
prod = {head = 475778,
tail = 475778, single = 0}, pad1 = 0 '\000', cons = {head = 475778, tail
= 475778, single = 1}, pad2 = 0 '\000'}}
(gdb) p *((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[2]->in_ring
$12 = {r = {name = "dsw0_p2", '\000' <repeats 24 times>, flags = 6, memzone =
0xc0000001b0, size = 32768, mask = 32767, capacity = 16384, pad0 = 0 '\000',
prod = {head = 313358,
tail = 313358, single = 0}, pad1 = 0 '\000', cons = {head = 313358, tail
= 313358, single = 1}, pad2 = 0 '\000'}}
(gdb) p *((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[3]->in_ring
$13 = {r = {name = "dsw0_p3", '\000' <repeats 24 times>, flags = 6, memzone =
0xc000000240, size = 32768, mask = 32767, capacity = 16384, pad0 = 0 '\000',
prod = {head = 165403,
tail = 165403, single = 0}, pad1 = 0 '\000', cons = {head = 165403, tail
= 165403, single = 1}, pad2 = 0 '\000'}}
(gdb) p *((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[4]->in_ring
$14 = {r = {name = "dsw0_p4", '\000' <repeats 24 times>, flags = 6, memzone =
0xc0000002d0, size = 32768, mask = 32767, capacity = 16384, pad0 = 0 '\000',
prod = {head = 208237,
tail = 208237, single = 0}, pad1 = 0 '\000', cons = {head = 208237, tail
= 208237, single = 1}, pad2 = 0 '\000'}}
(gdb) p *((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[5]->in_ring
$15 = {r = {name = "dsw0_p5", '\000' <repeats 24 times>, flags = 6, memzone =
0xc000000360, size = 32768, mask = 32767, capacity = 16384, pad0 = 0 '\000',
prod = {head = 633700,
tail = 633700, single = 0}, pad1 = 0 '\000', cons = {head = 633700, tail
= 633700, single = 1}, pad2 = 0 '\000'}}
(gdb) p *((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[6]->in_ring
$16 = {r = {name = "dsw0_p6", '\000' <repeats 24 times>, flags = 6, memzone =
0xc0000003f0, size = 32768, mask = 32767, capacity = 16384, pad0 = 0 '\000',
prod = {head = 152617,
tail = 152617, single = 0}, pad1 = 0 '\000', cons = {head = 152617, tail
= 152617, single = 1}, pad2 = 0 '\000'}}
(gdb) p *((struct dsw_evdev
*)rte_eventdevs[0].data->dev_private)->ports[7]->in_ring
$17 = {r = {name = "dsw0_p7", '\000' <repeats 24 times>, flags = 6, memzone =
0xc000000480, size = 32768, mask = 32767, capacity = 16384, pad0 = 0 '\000',
prod = {head = 0, tail = 0,
single = 0}, pad1 = 0 '\000', cons = {head = 0, tail = 0, single = 1},
pad2 = 0 '\000'}}
