Which version of vpp is involved?
A while ago, I went to considerable trouble to idiot-proof the vpp timebase
code [vlib_time_now()] against huge time jumps, particularly negative time
jumps. The ntp daemon is perfectly capable of resetting the kernel’s idea of
“now” by an hour or more in either direction. Your description is at least a
potential match for an older version of vpp falling victim to a “Back to the
Future” time jump.
At the point where timers stop expiring, use gdb to sanity-check “now” and
“tw->next_run_time”:
static inline
u32 * TW (tw_timer_expire_timers_internal) (TWT (tw_timer_wheel) * tw,
f64 now,
u32 * callback_vector_arg)
{
/* Called too soon to process new timer expirations? */
if (PREDICT_FALSE (now < tw->next_run_time))
return callback_vector_arg;
HTH... Dave
From: vpp-dev@lists.fd.io On Behalf Of hari_akkin via
lists.fd.io
Sent: Wednesday, March 17, 2021 5:21 AM
To: vpp-dev@lists.fd.io
Subject: [vpp-dev] timer_expired_callback is not getting called after sometime
Hi,
I have tw implementation and its working fine for sometime and later the
timer_expired_callback function is not invoked even though the tw node is
getting scheduled.
Detals:
tw_node of type VLIB_NODE_TYPE_INPUT.
Node function calls run_timer_wheels :
run_timer_wheels(vm)
{
tw_timer_wheel_1t_1w_2048sl_t* tw;
f64 now;
u32 thread_id = vlib_get_current_worker_index();
tw = &p_main->timer_wheels[thread_id];
now = vlib_time_now (vm);
tw_timer_expire_timers_1t_1w_2048sl(tw, now);
}
Init:
initialize_timer_wheels ()
{
.
.
tw_timer_wheel_1t_1w_2048sl_t* tw;
int i=0;
u32 n_workers = vlib_num_workers();
vec_validate (p_main->timer_wheels, n_workers-1);
for(i=0; itimer_wheels[i];
tw_timer_wheel_init_1t_1w_2048sl (tw, timer_expired_callback, 0.1,
1024);
tw->last_run_time = vlib_time_now (vlib_get_main());
}
}
Start Function:
start_timer_wheels()
{
u32 n_workers = vlib_num_workers();
for(int i=0; istop_timer_handle[i] =
tw_timer_start_1t_1w_2048sl(&p_main->timer_wheels[i],
i
/*elt-index*/,
0
/*timer-id*/,
1
/*interval*/);
}
return 0;
}
timer_expired_callback (u32 * expired_timers)
{
int i = 0;
u32 thread_id =
vlib_get_current_worker_index();
vlib_main_t *vm = vlib_get_main();
f64 time_now= vlib_time_now(vm);
for (i = 0; i < vec_len (expired_timers); i++)
{
/* application logic */
}
p_main->stop_timer_handle[thread_id] =
tw_timer_start_1t_1w_2048sl(&p_main->timer_wheels[thread_id],
thread_id,
0,
1);
}
Any thing I am missing here.
thanks.
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