Bug 483416 - Powertop: 99.4% (82314.7) <interrupt> : ahci, uhci_hcd:usb5, yenta, i915@pci:0000:00:02.0
Powertop: 99.4% (82314.7) <interrupt> : ahci, uhci_hcd:usb5, yenta, i91...
Status: CLOSED CURRENTRELEASE
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
10
x86_64 Linux
low Severity high
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Assigned To: Kernel Maintainer List
Fedora Extras Quality Assurance
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2009-01-31 19:56 EST by Manny
Modified: 2009-07-27 12:59 EDT (History)
1 user (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed: 2009-07-27 12:59:34 EDT
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CRM:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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Description Manny 2009-01-31 19:56:03 EST
Description of problem:
System experiences slowdown from too many interrupts being fired. CPU does not go back to low frequency. GPU and CPU temperature elevated.

Version-Release number of selected component (if applicable):
Linux thinx 2.6.27.12-170.2.5.fc10.x86_64 #1 SMP Wed Jan 21 01:33:24 EST 2009 x86_64 x86_64 x86_64 GNU/Linux

How reproducible:
Tends to be triggered by activities that tend to use the graphics display highly. Such as flash videos.

Steps to Reproduce:
1. Turn on computer
2. Use system normally. 

  
Actual results:


Expected results:
System should perform normally. Interrupt should not be the top causes for cpu wakeups.



Additional info:

Powertop:
     PowerTOP version 1.10      (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        (58.6%)         1.61 Ghz    17.8%
C0                0.0ms ( 0.0%)         1.60 Ghz    19.4%
C1                0.2ms ( 0.0%)         1200 Mhz    62.7%
C2                0.0ms ( 0.7%)          800 Mhz     0.0%
C3                1.6ms (40.8%)

Wakeups-from-idle per second : 2404.5   interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  99.3% (68288.4)       <interrupt> : ahci, uhci_hcd:usb5, yenta, i915@pci:0000:00:02.0 
   0.2% (155.2)      <kernel IPI> : Rescheduling interrupts 
   0.1% ( 94.9)       <interrupt> : uhci_hcd:usb3, eth0 
   0.1% ( 83.0)       <interrupt> : acpi 
   0.0% ( 27.1)   USB device  5-1 : USB Receiver (Logitech) 
   0.0% ( 19.9)          gnome-do : futex_wait (hrtimer_wakeup) 
-------------------------

cat /proc/interrupts 
           CPU0       CPU1       
  0:    1803156     129310   IO-APIC-edge      timer
  1:         15       2299   IO-APIC-edge      i8042
  5:          4          6   IO-APIC-edge      serial
  8:          0          1   IO-APIC-edge      rtc0
  9:        367     317971   IO-APIC-fasteoi   acpi
 12:         92         72   IO-APIC-edge      i8042
 16:       2169  243652699   IO-APIC-fasteoi   ahci, uhci_hcd:usb5, yenta, i915@pci:0000:00:02.0
 17:     175559        206   IO-APIC-fasteoi   uhci_hcd:usb6, firewire_ohci, HDA Intel, iwlagn
 18:          0          0   IO-APIC-fasteoi   mmc0
 19:          1          1   IO-APIC-fasteoi   ehci_hcd:usb2
 20:     541163         15   IO-APIC-fasteoi   uhci_hcd:usb3, eth0
 21:          0          0   IO-APIC-fasteoi   uhci_hcd:usb4
 22:      70328          2   IO-APIC-fasteoi   ehci_hcd:usb1
NMI:          0          0   Non-maskable interrupts
LOC:     482787    1775606   Local timer interrupts
RES:     689847     138604   Rescheduling interrupts
CAL:      10868        236   function call interrupts
TLB:       1101       1761   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
SPU:          0          0   Spurious interrupts
ERR:          0

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