Strange CPU load - acpi_os_read_port

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

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

curious.
does /proc/interrupts show you are receiving acpi interrupts? if yes, what do you see with 'grep . /sys/firmware/acpi/interrupts/*'?

what do you see with
grep . /sys/devices/system/cpu/cpu*/cpuidle/*/*

and if there are IO states, any change if you boot with "idle=halt" or "idle=mwait"?

thanks,
-Len Brown
Intel Open Source Technology Center

W dniu 2010-08-15 05:33, Len Brown pisze:

:) too much time has passed since my first post
so i change many things
I can try to reproduce this again but it will take some time.

For now the solution for me was:

Change configuration for this host and boot with processor.max_cstate=0

now perf top shows:
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
PerfTop: 11670 irqs/sec kernel:99.7% exact: 0.0% [1000Hz
cycles], (all, 16 CPUs)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

samples pcnt function DSO
_______ _____ ___________________________
_________________________________

            12146.00 13.6% _raw_spin_lock              
/lib/modules/2.6.35/build/vmlinux
             3722.00  4.2% ipt_do_table                
/lib/modules/2.6.35/build/vmlinux
             3161.00  3.5% rb_next                     
/lib/modules/2.6.35/build/vmlinux
             2950.00  3.3% u32_classify                
/lib/modules/2.6.35/build/vmlinux
             2285.00  2.6% rb_first                    
/lib/modules/2.6.35/build/vmlinux
             2280.00  2.6% tick_program_event          
/lib/modules/2.6.35/build/vmlinux
             2186.00  2.4% rb_erase                    
/lib/modules/2.6.35/build/vmlinux
             2143.00  2.4% igb_poll                    
/lib/modules/2.6.35/build/vmlinux
             2027.00  2.3% hfsc_enqueue                
/lib/modules/2.6.35/build/vmlinux
             1822.00  2.0% cftree_insert               
/lib/modules/2.6.35/build/vmlinux
             1791.00  2.0% vttree_insert               
/lib/modules/2.6.35/build/vmlinux
             1775.00  2.0% apic_timer_interrupt        
/lib/modules/2.6.35/build/vmlinux
             1614.00  1.8% dev_queue_xmit              
/lib/modules/2.6.35/build/vmlinux
             1593.00  1.8% hfsc_dequeue                
/lib/modules/2.6.35/build/vmlinux
             1457.00  1.6% __hrtimer_start_range_ns    
/lib/modules/2.6.35/build/vmlinux
             1433.00  1.6% irq_entries_start           
/lib/modules/2.6.35/build/vmlinux
             1359.00  1.5% rb_insert_color             
/lib/modules/2.6.35/build/vmlinux
             1334.00  1.5% hrtimer_interrupt           
/lib/modules/2.6.35/build/vmlinux
             1212.00  1.4% pskb_expand_head            
/lib/modules/2.6.35/build/vmlinux
             1168.00  1.3% tick_dev_program_event      
/lib/modules/2.6.35/build/vmlinux
             1031.00  1.2% T.1040                      
/lib/modules/2.6.35/build/vmlinux
             1031.00  1.2% rb_last                     

/lib/modules/2.6.35/build/vmlinux

without processor.max_cstate=0 at boot i have

acpi_os_read_port in the top

Thanks
Pawel

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likely it will come back when you remove processor.max_cstate=0, and it will go away if you use either idle=halt or idle=mwait or processor.max_cstate=1, which are effectively the same. (and all preferable to processor.max_cstate-0 from a power saving point of view)

If this is true, then you should try processor.max_cstate=N where N is 2, 3 etc, depending on the states shown in the cpuidle grep above.

If you open a bugzilla and attach the output from acpidump, that may also be helpful. If this is due to c-states, the question is if for some reason we are not using them optimally. If we already are doing what the platform allows, the route might be to use PM_QOS to disable states that
are too expensive. (Documentation/power/pm_qos_interface.txt)

cheers,
Len Brown, Intel Open Source Technology Center.

W dniu 2010-08-15 16:05, Len Brown pisze:

cat /proc/interrupts | grep acpi
9: 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 IO-APIC-fasteoi acpi

No interrupts

/sys/firmware/acpi/interrupts/error: 0

/sys/firmware/acpi/interrupts/ff_gbl_lock:       0      enabled
/sys/firmware/acpi/interrupts/ff_pmtimer:       0       invalid
/sys/firmware/acpi/interrupts/ff_pwr_btn:       0       enabled
/sys/firmware/acpi/interrupts/ff_rt_clk:       0        disabled
/sys/firmware/acpi/interrupts/ff_slp_btn:       0       invalid
/sys/firmware/acpi/interrupts/gpe00:       0    invalid
/sys/firmware/acpi/interrupts/gpe01:       0    invalid
/sys/firmware/acpi/interrupts/gpe02:       0    disabled
/sys/firmware/acpi/interrupts/gpe03:       0    disabled
/sys/firmware/acpi/interrupts/gpe04:       0    disabled
/sys/firmware/acpi/interrupts/gpe05:       0    disabled
/sys/firmware/acpi/interrupts/gpe06:       0    enabled
/sys/firmware/acpi/interrupts/gpe07:       0    invalid
/sys/firmware/acpi/interrupts/gpe08:       0    enabled
/sys/firmware/acpi/interrupts/gpe09:       0    disabled
/sys/firmware/acpi/interrupts/gpe0A:       0    enabled
/sys/firmware/acpi/interrupts/gpe0B:       0    disabled
/sys/firmware/acpi/interrupts/gpe0C:       0    disabled
/sys/firmware/acpi/interrupts/gpe0D:       0    disabled
/sys/firmware/acpi/interrupts/gpe0E:       0    disabled
/sys/firmware/acpi/interrupts/gpe0F:       0    invalid
/sys/firmware/acpi/interrupts/gpe10:       0    invalid
/sys/firmware/acpi/interrupts/gpe11:       0    invalid
/sys/firmware/acpi/interrupts/gpe12:       0    invalid
/sys/firmware/acpi/interrupts/gpe13:       0    invalid
/sys/firmware/acpi/interrupts/gpe14:       0    invalid
/sys/firmware/acpi/interrupts/gpe15:       0    invalid
/sys/firmware/acpi/interrupts/gpe16:       0    invalid
/sys/firmware/acpi/interrupts/gpe17:       0    invalid
/sys/firmware/acpi/interrupts/gpe18:       0    invalid
/sys/firmware/acpi/interrupts/gpe19:       0    invalid
/sys/firmware/acpi/interrupts/gpe1A:       0    invalid
/sys/firmware/acpi/interrupts/gpe1B:       0    invalid
/sys/firmware/acpi/interrupts/gpe1C:       0    invalid
/sys/firmware/acpi/interrupts/gpe1D:       0    invalid
/sys/firmware/acpi/interrupts/gpe1E:       0    enabled
/sys/firmware/acpi/interrupts/gpe1F:       0    invalid
/sys/firmware/acpi/interrupts/gpe20:       0    disabled
/sys/firmware/acpi/interrupts/gpe21:       0    invalid
/sys/firmware/acpi/interrupts/gpe22:       0    invalid
/sys/firmware/acpi/interrupts/gpe23:       0    invalid
/sys/firmware/acpi/interrupts/gpe24:       0    invalid
/sys/firmware/acpi/interrupts/gpe25:       0    invalid
/sys/firmware/acpi/interrupts/gpe26:       0    invalid
/sys/firmware/acpi/interrupts/gpe27:       0    invalid
/sys/firmware/acpi/interrupts/gpe28:       0    invalid
/sys/firmware/acpi/interrupts/gpe29:       0    invalid
/sys/firmware/acpi/interrupts/gpe2A:       0    invalid
/sys/firmware/acpi/interrupts/gpe2B:       0    invalid
/sys/firmware/acpi/interrupts/gpe2C:       0    invalid
/sys/firmware/acpi/interrupts/gpe2D:       0    invalid
/sys/firmware/acpi/interrupts/gpe2E:       0    invalid
/sys/firmware/acpi/interrupts/gpe2F:       0    invalid
/sys/firmware/acpi/interrupts/gpe30:       0    invalid
/sys/firmware/acpi/interrupts/gpe31:       0    invalid
/sys/firmware/acpi/interrupts/gpe32:       0    invalid
/sys/firmware/acpi/interrupts/gpe33:       0    invalid
/sys/firmware/acpi/interrupts/gpe34:       0    invalid
/sys/firmware/acpi/interrupts/gpe35:       0    invalid
/sys/firmware/acpi/interrupts/gpe36:       0    invalid
/sys/firmware/acpi/interrupts/gpe37:       0    invalid
/sys/firmware/acpi/interrupts/gpe38:       0    invalid
/sys/firmware/acpi/interrupts/gpe39:       0    invalid
/sys/firmware/acpi/interrupts/gpe3A:       0    invalid
/sys/firmware/acpi/interrupts/gpe3B:       0    invalid
/sys/firmware/acpi/interrupts/gpe3C:       0    invalid
/sys/firmware/acpi/interrupts/gpe3D:       0    invalid
/sys/firmware/acpi/interrupts/gpe3E:       0    invalid
/sys/firmware/acpi/interrupts/gpe3F:       0    invalid

/sys/firmware/acpi/interrupts/gpe_all: 0
/sys/firmware/acpi/interrupts/sci: 0
/sys/firmware/acpi/interrupts/sci_not: 0

ls /sys/devices/system/cpu/cpu0/
cache crash_notes node0 thermal_throttle topology

no cpuidle dir.
grep . /sys/devices/system/cpu/cpuidle/* /sys/devices/system/cpu/cpuidle/current_driver:acpi_idle /sys/devices/system/cpu/cpuidle/current_governor_ro:ladder