Hello
I have strange problem with cpu load and acpi_os_read_port
please look at
perf top - output:
PerfTop: 1852 irqs/sec kernel:99.4% exact: 0.0% [1000Hz
cycles], (all, 16 CPUs)
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
samples pcnt function DSO
_______ _____ _______________________________
_________________
2217.00 13.7% acpi_os_read_port
[kernel.kallsyms]
613.00 3.8% igb_poll
[kernel.kallsyms]
546.00 3.4% acpi_idle_enter_bm
[kernel.kallsyms]
482.00 3.0% _raw_spin_lock
[kernel.kallsyms]
469.00 2.9% ipt_do_table
[kernel.kallsyms]
415.00 2.6% find_busiest_group
[kernel.kallsyms]
341.00 2.1% tick_dev_program_event
[kernel.kallsyms]
299.00 1.9% u32_classify
[kernel.kallsyms]
299.00 1.9% __slab_free
[kernel.kallsyms]
294.00 1.8% timer_stats_update_stats
[kernel.kallsyms]
235.00 1.5% leave_mm
[kernel.kallsyms]
231.00 1.4% skb_release_data
[kernel.kallsyms]
227.00 1.4% __hrtimer_start_range_ns
[kernel.kallsyms]
220.00 1.4% tick_program_event
[kernel.kallsyms]
211.00 1.3% irq_entries_start
[kernel.kallsyms]
206.00 1.3% cpuidle_idle_call
[kernel.kallsyms]
181.00 1.1% acpi_hw_validate_io_request
[kernel.kallsyms]
178.00 1.1% apic_timer_interrupt
[kernel.kallsyms]
172.00 1.1% consume_skb
[kernel.kallsyms]
162.00 1.0% getnstimeofday
[kernel.kallsyms]
162.00 1.0% rb_erase
[kernel.kallsyms]
161.00 1.0% read_tsc
[kernel.kallsyms]
154.00 1.0% hrtimer_interrupt
[kernel.kallsyms]
148.00 0.9% _raw_spin_unlock_irqrestore
[kernel.kallsyms]
148.00 0.9% napi_schedule
[kernel.kallsyms]
136.00 0.8% __do_softirq
[kernel.kallsyms]
135.00 0.8% dma_issue_pending_all
[kernel.kallsyms]
130.00 0.8% virt_to_head_page
[kernel.kallsyms]
125.00 0.8% clockevents_program_event
[kernel.kallsyms]
118.00 0.7% ladder_select_state
[kernel.kallsyms]
114.00 0.7% hrtimer_force_reprogram
[kernel.kallsyms]
108.00 0.7% timekeeping_get_ns
[kernel.kallsyms]
107.00 0.7% __dma_has_cap
[kernel.kallsyms]
105.00 0.7% dev_queue_xmit
[kernel.kallsyms]
103.00 0.6% acpi_idle_do_entry
[kernel.kallsyms]
102.00 0.6% kfree
[kernel.kallsyms]
98.00 0.6% sched_clock
[kernel.kallsyms]
95.00 0.6% load_balance
[kernel.kallsyms]
95.00 0.6% pskb_expand_head
[kernel.kallsyms]
88.00 0.5% kmem_cache_free
[kernel.kallsyms]
86.00 0.5% run_timer_softirq
[kernel.kallsyms]
84.00 0.5% __rcu_pending
[kernel.kallsyms]
82.00 0.5% acpi_processor_ffh_cstate_enter
[kernel.kallsyms]
80.00 0.5% notifier_call_chain
[kernel.kallsyms]
80.00 0.5% acpi_hw_read_port
[kernel.kallsyms]
79.00 0.5% nf_iterate
[kernel.kallsyms]
77.00 0.5% dev_gro_receive
[kernel.kallsyms]
77.00 0.5% rb_insert_color
[kernel.kallsyms]
75.00 0.5% find_next_bit
[kernel.kallsyms]
74.00 0.5% skb_header_pointer
[kernel.kallsyms]
72.00 0.4% run_posix_cpu_timers
[kernel.kallsyms]
72.00 0.4% hfsc_enqueue
[kernel.kallsyms]
69.00 0.4% run_rebalance_domains
[kernel.kallsyms]
68.00 0.4% __napi_complete
[kernel.kallsyms]
67.00 0.4% ktime_get
[kernel.kallsyms]
67.00 0.4% scheduler_tick
[kernel.kallsyms]
66.00 0.4% skb_release_head_state
[kernel.kallsyms]
64.00 0.4% __run_hrtimer
[kernel.kallsyms]
64.00 0.4% acpi_hw_validate_register
[kernel.kallsyms]
62.00 0.4% ip_route_input_common
[kernel.kallsyms]
mpstat -P 1,2 1 10
Linux 2.6.35-rc5 (eP-RTR-IX-01) 07/22/10 _x86_64_
(16 CPU)
23:39:26 CPU %usr %nice %sys %iowait %irq %soft
%steal %guest %idle
23:39:27 1 0.00 0.00 0.00 0.00 0.00 52.00
0.00 0.00 48.00
23:39:27 2 0.00 0.00 0.00 0.00 0.00 17.00
0.00 0.00 83.00
23:39:28 1 0.00 0.00 0.00 0.00 0.00 39.00
0.00 0.00 61.00
23:39:28 2 0.00 0.00 0.00 0.00 0.00 8.00
0.00 0.00 92.00
23:39:29 1 0.00 0.00 0.00 0.00 0.00 47.00
0.00 0.00 53.00
23:39:29 2 0.00 0.00 0.00 0.00 0.00 9.00
0.00 0.00 91.00
23:39:30 1 58.00 0.00 0.00 0.00 0.00 42.00
0.00 0.00 0.00
23:39:30 2 0.00 0.00 0.00 0.00 0.00 18.00
0.00 0.00 82.00
23:39:31 1 9.00 0.00 0.00 0.00 0.00 51.00
0.00 0.00 40.00
23:39:31 2 2.00 0.00 0.00 0.00 0.00 18.00
0.00 0.00 80.00
23:39:32 1 0.00 0.00 0.00 0.00 0.00 39.00
0.00 0.00 61.00
23:39:32 2 2.00 0.00 0.00 0.00 0.00 20.00
0.00 0.00 78.00
23:39:33 1 0.00 0.00 0.00 0.00 0.00 48.00
0.00 0.00 52.00
23:39:33 2 0.00 0.00 0.00 0.00 0.00 13.00
0.00 0.00 87.00
23:39:34 1 0.00 0.00 0.00 0.00 0.00 52.00
0.00 0.00 48.00
23:39:34 2 0.00 0.00 0.00 0.00 0.00 9.00
0.00 0.00 91.00
23:39:35 1 0.00 0.00 0.00 0.00 0.00 52.00
0.00 0.00 48.00
23:39:35 2 0.00 0.00 0.00 0.00 0.00 18.00
0.00 0.00 82.00
23:39:36 1 0.00 0.00 0.00 0.00 0.00 50.00
0.00 0.00 50.00
23:39:36 2 0.00 0.00 0.00 0.00 0.00 9.00
0.00 0.00 91.00
Average: 1 6.70 0.00 0.00 0.00 0.00 47.20
0.00 0.00 46.10
Average: 2 0.40 0.00 0.00 0.00 0.00 13.90
0.00 0.00 85.70
Server is acting as a bgp router - 500Mbit/s RX / 500Mbit/s TX traffic.
But the topper of cpu load is acpi_os_read_port - why ?
Thanks
Pawel
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