Hi,team.
During the forwarding process, we used bpf to capture
the pmd cutout time and found that the pmd process was
locked in the upcall process and was unable to process
the forwarding process.
Here I think it is not appropriate for the pmd process
and the upcall process of ovs-dpdk to be coupled together.
There are a large number of locks in the upcall process,
which will cause the pmd to be locked and unable to send
and receive packets. Why don't we consider splitting the
upcall in the ovs-dpdk scenario to reduce the impact on pmd.
12:54:07 575095643125024 - Switch: [062] swapper/62:0 -> pmd-c62/id:135:454907
| latency 57018 us | curr_task(swapper/62-0)
__GI___lll_lock_wait+80
__GI___pthread_mutex_lock+268
ovs_mutex_lock_at+32
seq_change+40
tnl_neigh_set+208
compose_output_action__+2712
output_normal+584
xlate_output_action+2524
do_xlate_actions+712
xlate_actions+2764
process_upcall+852
upcall_cb+304
dp_netdev_upcall+172
fast_path_processing+2580
dp_netdev_input__+2652
dp_netdev_input+20
dp_netdev_process_rxq_port+352
0xffffffff0000
ovsthread_wrapper+136
start_thread+724
thread_start+12
21:42:05 520373736472757 - Switch: [095] swapper/95:0 -> pmd-c95/id:133:454905
| latency 13706 us | curr_task(swapper/95-0)
__GI___lll_lock_wait+80
__GI___pthread_mutex_lock+268
ovs_mutex_lock_at+32
fat_rwlock_rdlock+56
tnl_port_send+52
compose_output_action__+1700
xlate_output_action+1252
do_xlate_actions+8620
do_xlate_actions+5264
......
do_xlate_actions+5264
clone_xlate_actions+316
do_xlate_actions+4156
do_xlate_actions+5264
......
do_xlate_actions+5264
xlate_actions+2764
process_upcall+852
upcall_cb+304
dp_netdev_upcall+172
fast_path_processing+2580
dp_netdev_input__+2652
dp_netdev_input+20
dp_netdev_process_rxq_port+352
0xffffffff0000
ovsthread_wrapper+136
start_thread+724
thread_start+12
21:42:05 520373736243062 - Switch: [094] swapper/94:0 -> pmd-c94/id:137:454909
| latency 13992 us | curr_task(swapper/94-0)
__GI___lll_lock_wait+80
__GI___pthread_mutex_lock+268
ovs_mutex_lock_at+32
fat_rwlock_rdlock+56
tnl_port_receive+76
xlate_lookup+124
upcall_cb+188
dp_netdev_upcall+172
fast_path_processing+2580
dp_netdev_input__+2652
dp_execute_cb+4040
odp_execute_actions+452
dp_netdev_input__+1204
dp_netdev_input+20
dp_netdev_process_rxq_port+352
0xffffffff0000
ovsthread_wrapper+136
start_thread+724
thread_start+12
15:56:12 499620650630327 - Switch: [094] swapper/94:0 -> pmd-c94/id:137:2566810
| latency 640 us | curr_task(swapper/94-0):
__GI___lll_lock_wait+80
__GI___pthread_mutex_lock+712
ovs_mutex_lock_at+32
rule_dpif_credit_stats+48
do_xlate_actions+5196
do_xlate_actions+5264
......
do_xlate_actions+5264
xlate_actions+2764
process_upcall+852
upcall_cb+304
dp_netdev_upcall+172
fast_path_processing+2580
dp_netdev_input__+2652
dp_netdev_input+20
dp_netdev_process_rxq_port+352
0xffffffff0000
ovsthread_wrapper+136
start_thread+724
thread_start+12
Jun Wang_______________________________________________
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