Re: Pin-pointing the root of unusual application latencies

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Alessio Igor Bogani wrote:

John Sigler wrote:

# cat /proc/interrupts
            CPU0
   0:         37    XT-PIC-XT        timer

Just curious: Can you post the output of the "cat /proc/timer_list" ?

Kernel command line: [...] lpj=12667000 lapic nmi_watchdog=0 idle=halt

Kernel configuration:
http://linux.kernel.free.fr/latency/config-2.6.20.7-rt8-adlink-latency

# cat /proc/timer_list
Timer List Version: v0.3
HRTIMER_MAX_CLOCK_BASES: 2
now at 3759145433320 nsecs

cpu: 0
 clock 0:
  .index:      0
  .resolution: 1 nsecs
  .get_time:   ktime_get_real
  .offset:     1185370134437814624 nsecs
active timers:
 clock 1:
  .index:      1
  .resolution: 1 nsecs
  .get_time:   ktime_get
  .offset:     0 nsecs
active timers:
 #0: <cf795e74>, tick_sched_timer, S:01
 # expires at 3759150000000 nsecs [in 4566680 nsecs]
 #1: <cf795e74>, it_real_fn, S:01
 # expires at 5027741374801 nsecs [in 1268595941481 nsecs]
  .expires_next   : 3759150000000 nsecs
  .hres_active    : 1
  .nr_events      : 375503
  .nohz_mode      : 0
  .idle_tick      : 0 nsecs
  .tick_stopped   : 0
  .idle_jiffies   : 0
  .idle_calls     : 0
  .idle_sleeps    : 0
  .idle_entrytime : 0 nsecs
  .idle_sleeptime : 0 nsecs
  .last_jiffies   : 0
  .next_jiffies   : 0
  .idle_expires   : 0 nsecs
jiffies: 345914


Tick Device: mode:     1
Clock Event Device: pit
 max_delta_ns:   27461866
 min_delta_ns:   12571
 mult:           5124677
 shift:          32
 mode:           3
 next_event:     9223372036854775807 nsecs
 set_next_event: pit_next_event
 set_mode:       init_pit_timer
 event_handler:  tick_handle_oneshot_broadcast
tick_broadcast_mask: 00000000
tick_broadcast_oneshot_mask: 00000000


Tick Device: mode:     1
Clock Event Device: lapic
 max_delta_ns:   1006582530
 min_delta_ns:   1799
 mult:           35793183
 shift:          32
 mode:           3
 next_event:     3759150000000 nsecs
 set_next_event: lapic_next_event
 set_mode:       lapic_timer_setup
 event_handler:  hrtimer_interrupt
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