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TIMER: Properly calibrate clocks while throttling

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This commit is contained in:
Mark Pizzolato 2017-06-11 05:00:42 -07:00
parent 7e32130e1e
commit 9accb79b92
1 changed files with 34 additions and 18 deletions
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40
sim_timer.c
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@ -775,6 +775,7 @@ t_stat sim_timer_tick_svc (UNIT *uptr);
#define DBG_THR 0x040 /* throttle activities */
#define DBG_ACK 0x080 /* interrupt acknowledgement activities */
#define DBG_CHK 0x100 /* check scheduled activation time*/
#define DBG_INT 0x200 /* internal timer activities */
DEBTAB sim_timer_debug[] = {
{"TRACE", DBG_TRC, "Trace routine calls"},
{"IDLE", DBG_IDL, "Idling activities"},
@ -782,6 +783,7 @@ DEBTAB sim_timer_debug[] = {
{"IACK", DBG_ACK, "interrupt acknowledgement activities"},
{"CALIB", DBG_CAL, "Calibration activities"},
{"TIME", DBG_TIM, "Activation and scheduling activities"},
{"INTER", DBG_INT, "Internal timer activities"},
{"THROT", DBG_THR, "Throttling activities"},
{"MUX", DBG_MUX, "Tmxr scheduling activities"},
{"CHECK", DBG_CHK, "Check scheduled activation time"},
@ -882,6 +884,9 @@ if (rtc_hz[tmr] != ticksper) { /* changing tick rate? *
_rtcn_configure_calibrated_clock (tmr);
if (ticksper != 0) {
rtc_clock_tick_size[tmr] = 1.0 / ticksper;
if (sim_throt_type != SIM_THROT_NONE)
rtc_currd[tmr] = (int32)(sim_throt_cps / ticksper);
else
rtc_currd[tmr] = (int32)(sim_timer_inst_per_sec () / ticksper);
}
}
@ -1607,7 +1612,10 @@ else {
}
}
sim_register_internal_device (&sim_throttle_dev); /* Register Throttle Device */
sim_throt_cps = SIM_INITIAL_IPS; /* Initial value while correct one is determined */
if (sim_throt_type == SIM_THROT_SPC) /* Set initial value while correct one is determined */
sim_throt_cps = (int32)((1000.0 * sim_throt_val) / (double)sim_throt_sleep_time);
else
sim_throt_cps = SIM_INITIAL_IPS;
return SCPE_OK;
}
@ -1680,18 +1688,21 @@ int32 tmr;
uint32 delta_ms;
double a_cps, d_cps;
if (sim_throt_type == SIM_THROT_SPC) { /* Non dynamic? */
sim_throt_state = SIM_THROT_STATE_THROTTLE; /* force state */
sim_throt_wait = sim_throt_val;
}
switch (sim_throt_state) {
case SIM_THROT_STATE_INIT: /* take initial reading */
sim_idle_ms_sleep (sim_idle_rate_ms); /* start on a tick boundary to calibrate */
sim_throt_ms_start = sim_os_msec ();
sim_throt_inst_start = sim_gtime();
if (sim_throt_type != SIM_THROT_SPC) { /* dynamic? */
sim_throt_wait = SIM_THROT_WST;
sim_throt_state = SIM_THROT_STATE_TIME; /* next state */
}
else { /* Non dynamic? */
sim_throt_wait = sim_throt_val;
sim_throt_state = SIM_THROT_STATE_THROTTLE; /* force state */
sim_throt_cps = (int32)((1000.0 * sim_throt_val) / (double)sim_throt_sleep_time);
}
sim_debug (DBG_THR, &sim_timer_dev, "sim_throt_svc(INIT) Starting. Values wait = %d\n", sim_throt_wait);
break; /* reschedule */
@ -1753,10 +1764,11 @@ switch (sim_throt_state) {
case SIM_THROT_STATE_THROTTLE: /* throttling */
sim_idle_ms_sleep (sim_throt_sleep_time);
delta_ms = sim_os_msec () - sim_throt_ms_start;
if (sim_throt_type != SIM_THROT_SPC) { /* when not dynamic throttling */
if (delta_ms >= 10000) { /* recompute every 10 sec */
double delta_insts = sim_gtime() - sim_throt_inst_start;
a_cps = (delta_insts * 1000.0) / (double) delta_ms;
if (sim_throt_type != SIM_THROT_SPC) { /* when not dynamic throttling */
if (sim_throt_type == SIM_THROT_MCYC) /* calc desired cps */
d_cps = (double) sim_throt_val * 1000000.0;
else if (sim_throt_type == SIM_THROT_KCYC)
@ -1768,12 +1780,15 @@ switch (sim_throt_state) {
sim_debug (DBG_THR, &sim_timer_dev, "sim_throt_svc() Recalibrating throttle based on values a_cps = %f, d_cps = %f\n",
a_cps, d_cps);
}
sim_throt_ms_start = sim_os_msec ();
sim_throt_inst_start = sim_gtime();
}
else { /* record instruction rate */
sim_throt_cps = (int32)a_cps;
sim_debug (DBG_THR, &sim_timer_dev, "sim_throt_svc() Recalibrating Special %d/%d Cycles Per Second of %d\n",
sim_throt_wait, sim_throt_sleep_time, sim_throt_cps);
}
sim_throt_ms_start = sim_os_msec ();
}
else /* record instruction rate */
sim_throt_cps = (int32)((1000.0 * sim_throt_val) / (double)delta_ms);
break;
}
@ -2074,6 +2089,7 @@ static int32 sim_int_clk_tps;
static t_stat sim_timer_clock_tick_svc (UNIT *uptr)
{
sim_debug(DBG_INT, &sim_timer_dev, "sim_timer_clock_tick_svc()\n");
sim_rtcn_calb (sim_int_clk_tps, SIM_INTERNAL_CLK);
sim_activate_after (uptr, 1000000/sim_int_clk_tps); /* reactivate unit */
return SCPE_OK;
@ -2127,7 +2143,7 @@ if (tmr == SIM_NTIMERS) { /* None found? */
}
/* Start the internal timer */
sim_calb_tmr = SIM_NTIMERS;
sim_debug (DBG_CAL, &sim_timer_dev, "_rtcn_configure_calibrated_clock(newtmr=%d) - Starting Internal Calibrated Timer at %dHz\n", newtmr, sim_int_clk_tps);
sim_debug (DBG_CAL|DBG_INT, &sim_timer_dev, "_rtcn_configure_calibrated_clock(newtmr=%d) - Starting Internal Calibrated Timer at %dHz\n", newtmr, sim_int_clk_tps);
SIM_INTERNAL_UNIT.action = &sim_timer_clock_tick_svc;
SIM_INTERNAL_UNIT.flags = UNIT_IDLE;
sim_register_internal_device (&sim_int_timer_dev); /* Register Internal timer device */
@ -2140,7 +2156,7 @@ if ((tmr == newtmr) &&
(sim_calb_tmr == newtmr)) /* already set? */
return;
if (sim_calb_tmr == SIM_NTIMERS) { /* was old the internal timer? */
sim_debug (DBG_CAL, &sim_timer_dev, "_rtcn_configure_calibrated_clock(newtmr=%d) - Stopping Internal Calibrated Timer, New Timer = %d (%dHz)\n", newtmr, tmr, rtc_hz[tmr]);
sim_debug (DBG_CAL|DBG_INT, &sim_timer_dev, "_rtcn_configure_calibrated_clock(newtmr=%d) - Stopping Internal Calibrated Timer, New Timer = %d (%dHz)\n", newtmr, tmr, rtc_hz[tmr]);
rtc_initd[SIM_NTIMERS] = 0;
rtc_hz[SIM_NTIMERS] = 0;
sim_register_clock_unit_tmr (NULL, SIM_INTERNAL_CLK);
@ -2166,7 +2182,7 @@ else {
}
rtc_hz[sim_calb_tmr] = 0; /* back to 0 */
}
sim_debug (DBG_CAL, &sim_timer_dev, "_rtcn_configure_calibrated_clock(newtmr=%d) - Changing Calibrated Timer from %d (%dHz) to %d (%dHz)\n", newtmr, sim_calb_tmr, rtc_hz[sim_calb_tmr], tmr, rtc_hz[tmr]);
sim_debug (DBG_CAL|DBG_INT, &sim_timer_dev, "_rtcn_configure_calibrated_clock(newtmr=%d) - Changing Calibrated Timer from %d (%dHz) to %d (%dHz)\n", newtmr, sim_calb_tmr, rtc_hz[sim_calb_tmr], tmr, rtc_hz[tmr]);
sim_calb_tmr = tmr;
}
sim_calb_tmr = tmr;