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    Subject[2.6.33-rc1] System timer flooding bus on Lenovo Thinkpad W500 laptop in x86_64
    Date
    Hello kernel devs,

    I am noticing a serious problem with the system timer flooding the bus with
    many interrupts for no reason. I have compiled the kernel with tickless
    enabled.

    Can someone provide me some debugging to find out why this is happening?

    As a comparsion my quad core box has no such issue: (Running 2.6.32-rc7)
    x86_64
    0: 42 4 1 1 IO-APIC-edge timer

    my Lenovo ThinkPad W500 (latest BIOS 3.11) laptop shows the system timer
    flooding the bus (Running 2.6.33-rc1) x86_64
    0: 66775 70429 IO-APIC-edge timer <-- keeps rising, rapidly

    and afew minutes ...

    0: 119849 124505 IO-APIC-edge timer

    Same for Rescheduling interrupts rising just as fast with the timer.

    This does not look right, powertop shows:

    40.0% ( 62.1) <kernel IPI> : Rescheduling interrupts
    22.9% ( 35.6) <interrupt> : extra timer interrupt
    17.0% ( 26.4) <interrupt> : iwlagn

    and another sample...

    54.6% (144.8) <kernel IPI> : Rescheduling interrupts
    14.6% ( 38.8) <interrupt> : extra timer interrupt
    8.5% ( 22.6) <interrupt> : iwlagn
    6.5% ( 17.2) <interrupt> : uhci_hcd:usb6, radeon@pci:0000:01:00.0
    6.5% ( 17.2) USB device 6-1 : Microsoft Basic Optical Mouse v2.0
    (Microsoft )

    There is no cause for the rescheduling interrupts and extra timer interrupt to
    wakeup the CPUs so much? Are there any timer issues?

    cpuinfo:

    processor : 0
    vendor_id : GenuineIntel
    cpu family : 6
    model : 23
    model name : Intel(R) Core(TM)2 Duo CPU T9400 @ 2.53GHz
    stepping : 10
    cpu MHz : 800.000
    cache size : 6144 KB
    physical id : 0
    siblings : 2
    core id : 0
    cpu cores : 2
    apicid : 0
    initial apicid : 0
    fpu : yes
    fpu_exception : yes
    cpuid level : 13
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
    cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm
    constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor
    ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm ida
    tpr_shadow vnmi flexpriority
    bogomips : 5054.98
    clflush size : 64
    cache_alignment : 64
    address sizes : 36 bits physical, 48 bits virtual
    power management:


    Below is lspci information:

    00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory
    Controller Hub (rev 07)
    Subsystem: Lenovo Device 20e0
    Flags: bus master, fast devsel, latency 0
    Capabilities: [e0] Vendor Specific Information <?>

    00:01.0 PCI bridge: Intel Corporation Mobile 4 Series Chipset PCI Express
    Graphics Port (rev 07) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
    I/O behind bridge: 00002000-00002fff
    Memory behind bridge: cff00000-cfffffff
    Prefetchable memory behind bridge: 00000000d0000000-00000000dfffffff
    Capabilities: [88] Subsystem: Lenovo Device 20e2
    Capabilities: [80] Power Management version 3
    Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [a0] Express Root Port (Slot+), MSI 00
    Capabilities: [100] Virtual Channel <?>
    Capabilities: [140] Root Complex Link <?>
    Kernel driver in use: pcieport

    00:03.0 Communication controller: Intel Corporation Mobile 4 Series Chipset
    MEI Controller (rev 07)
    Subsystem: Lenovo Device 20e6
    Flags: bus master, fast devsel, latency 0, IRQ 11
    Memory at fc226800 (64-bit, non-prefetchable) [size=16]
    Capabilities: [50] Power Management version 3
    Capabilities: [8c] MSI: Enable- Count=1/1 Maskable- 64bit+

    00:19.0 Ethernet controller: Intel Corporation 82567LM Gigabit Network
    Connection (rev 03)
    Subsystem: Lenovo Device 20ee
    Flags: bus master, fast devsel, latency 0, IRQ 29
    Memory at fc200000 (32-bit, non-prefetchable) [size=128K]
    Memory at fc225000 (32-bit, non-prefetchable) [size=4K]
    I/O ports at 1840 [size=32]
    Capabilities: [c8] Power Management version 2
    Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [e0] PCI Advanced Features
    Kernel driver in use: e1000e

    00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
    Controller #4 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Lenovo Device 20f0
    Flags: bus master, medium devsel, latency 0, IRQ 20
    I/O ports at 1860 [size=32]
    Capabilities: [50] PCI Advanced Features
    Kernel driver in use: uhci_hcd

    00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
    Controller #5 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Lenovo Device 20f0
    Flags: bus master, medium devsel, latency 0, IRQ 21
    I/O ports at 1880 [size=32]
    Capabilities: [50] PCI Advanced Features
    Kernel driver in use: uhci_hcd

    00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
    Controller #6 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Lenovo Device 20f0
    Flags: bus master, medium devsel, latency 0, IRQ 22
    I/O ports at 18a0 [size=32]
    Capabilities: [50] PCI Advanced Features
    Kernel driver in use: uhci_hcd

    00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
    Controller #2 (rev 03) (prog-if 20 [EHCI])
    Subsystem: Lenovo Device 20f1
    Flags: bus master, medium devsel, latency 0, IRQ 23
    Memory at fc226c00 (32-bit, non-prefetchable) [size=1K]
    Capabilities: [50] Power Management version 2
    Capabilities: [58] Debug port: BAR=1 offset=00a0
    Capabilities: [98] PCI Advanced Features
    Kernel driver in use: ehci_hcd

    00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
    Controller (rev 03)
    Subsystem: Lenovo Device 20f2
    Flags: bus master, fast devsel, latency 0, IRQ 32
    Memory at fc220000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: [50] Power Management version 2
    Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
    Capabilities: [100] Virtual Channel <?>
    Capabilities: [130] Root Complex Link <?>
    Kernel driver in use: HDA Intel

    00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1
    (rev 03) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
    I/O behind bridge: 00009000-00009fff
    Memory behind bridge: c0000000-c01fffff
    Prefetchable memory behind bridge: 00000000c0200000-00000000c03fffff
    Capabilities: [40] Express Root Port (Slot+), MSI 00
    Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [90] Subsystem: Lenovo Device 20f3
    Capabilities: [a0] Power Management version 2
    Capabilities: [100] Virtual Channel <?>
    Capabilities: [180] Root Complex Link <?>
    Kernel driver in use: pcieport

    00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2
    (rev 03) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
    I/O behind bridge: 0000a000-0000afff
    Memory behind bridge: f4200000-f42fffff
    Prefetchable memory behind bridge: 00000000c0400000-00000000c05fffff
    Capabilities: [40] Express Root Port (Slot+), MSI 00
    Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [90] Subsystem: Lenovo Device 20f3
    Capabilities: [a0] Power Management version 2
    Capabilities: [100] Virtual Channel <?>
    Capabilities: [180] Root Complex Link <?>
    Kernel driver in use: pcieport

    00:1c.3 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 4
    (rev 03) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=05, subordinate=0c, sec-latency=0
    I/O behind bridge: 00003000-00003fff
    Memory behind bridge: f8000000-f9ffffff
    Prefetchable memory behind bridge: 00000000f4000000-00000000f40fffff
    Capabilities: [40] Express Root Port (Slot+), MSI 00
    Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [90] Subsystem: Lenovo Device 20f3
    Capabilities: [a0] Power Management version 2
    Capabilities: [100] Virtual Channel <?>
    Capabilities: [180] Root Complex Link <?>
    Kernel driver in use: pcieport

    00:1c.4 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5
    (rev 03) (prog-if 00 [Normal decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=0d, subordinate=14, sec-latency=0
    I/O behind bridge: 00004000-00004fff
    Memory behind bridge: fa000000-fbffffff
    Prefetchable memory behind bridge: 00000000f4100000-00000000f41fffff
    Capabilities: [40] Express Root Port (Slot+), MSI 00
    Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [90] Subsystem: Lenovo Device 20f3
    Capabilities: [a0] Power Management version 2
    Capabilities: [100] Virtual Channel <?>
    Capabilities: [180] Root Complex Link <?>
    Kernel driver in use: pcieport

    00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
    Controller #1 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Lenovo Device 20f0
    Flags: bus master, medium devsel, latency 0, IRQ 16
    I/O ports at 18c0 [size=32]
    Capabilities: [50] PCI Advanced Features
    Kernel driver in use: uhci_hcd

    00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
    Controller #2 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Lenovo Device 20f0
    Flags: bus master, medium devsel, latency 0, IRQ 17
    I/O ports at 18e0 [size=32]
    Capabilities: [50] PCI Advanced Features
    Kernel driver in use: uhci_hcd

    00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
    Controller #3 (rev 03) (prog-if 00 [UHCI])
    Subsystem: Lenovo Device 20f0
    Flags: bus master, medium devsel, latency 0, IRQ 18
    I/O ports at 1c00 [size=32]
    Capabilities: [50] PCI Advanced Features
    Kernel driver in use: uhci_hcd

    00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
    Controller #1 (rev 03) (prog-if 20 [EHCI])
    Subsystem: Lenovo Device 20f1
    Flags: bus master, medium devsel, latency 0, IRQ 19
    Memory at fc227000 (32-bit, non-prefetchable) [size=1K]
    Capabilities: [50] Power Management version 2
    Capabilities: [58] Debug port: BAR=1 offset=00a0
    Capabilities: [98] PCI Advanced Features
    Kernel driver in use: ehci_hcd

    00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93) (prog-
    if 01 [Subtractive decode])
    Flags: bus master, fast devsel, latency 0
    Bus: primary=00, secondary=15, subordinate=18, sec-latency=32
    I/O behind bridge: 00005000-00008fff
    Memory behind bridge: f4300000-f7ffffff
    Prefetchable memory behind bridge: 00000000f0000000-00000000f3ffffff
    Capabilities: [50] Subsystem: Lenovo Device 20f4

    00:1f.0 ISA bridge: Intel Corporation ICH9M-E LPC Interface Controller (rev
    03)
    Subsystem: Lenovo Device 20f5
    Flags: bus master, medium devsel, latency 0
    Capabilities: [e0] Vendor Specific Information <?>

    00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev
    03) (prog-if 01 [AHCI 1.0])
    Subsystem: Lenovo Device 20f8
    Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 30
    I/O ports at 1c40 [size=8]
    I/O ports at 1834 [size=4]
    I/O ports at 1838 [size=8]
    I/O ports at 1830 [size=4]
    I/O ports at 1c20 [size=32]
    Memory at fc226000 (32-bit, non-prefetchable) [size=2K]
    Capabilities: [80] MSI: Enable+ Count=1/16 Maskable- 64bit-
    Capabilities: [70] Power Management version 3
    Capabilities: [a8] SATA HBA <?>
    Capabilities: [b0] PCI Advanced Features
    Kernel driver in use: ahci

    00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev
    03)
    Subsystem: Lenovo Device 20f9
    Flags: medium devsel, IRQ 23
    Memory at fc227400 (64-bit, non-prefetchable) [size=256]
    I/O ports at 1c60 [size=32]
    Kernel driver in use: i801_smbus

    01:00.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon HD
    3650 (prog-if 00 [VGA controller])
    Subsystem: Lenovo Device 2127
    Flags: bus master, fast devsel, latency 0, IRQ 16
    Memory at d0000000 (32-bit, prefetchable) [size=256M]
    I/O ports at 2000 [size=256]
    Memory at cfff0000 (32-bit, non-prefetchable) [size=64K]
    [virtual] Expansion ROM at cff00000 [disabled] [size=128K]
    Capabilities: [50] Power Management version 3
    Capabilities: [58] Express Legacy Endpoint, MSI 00
    Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+
    Capabilities: [100] Vendor Specific Information <?>

    03:00.0 Network controller: Intel Corporation PRO/Wireless 5100 AGN [Shiloh]
    Network Connection
    Subsystem: Intel Corporation Device 1211
    Flags: bus master, fast devsel, latency 0, IRQ 31
    Memory at f4200000 (64-bit, non-prefetchable) [size=8K]
    Capabilities: [c8] Power Management version 3
    Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [e0] Express Endpoint, MSI 00
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [140] Device Serial Number 00-22-fa-ff-ff-c8-53-ce
    Kernel driver in use: iwlagn

    15:00.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev ba)
    Subsystem: Lenovo Device 20c6
    Flags: bus master, medium devsel, latency 168, IRQ 16
    Memory at f4300000 (32-bit, non-prefetchable) [size=4K]
    Bus: primary=15, secondary=16, subordinate=17, sec-latency=176
    Memory window 0: f0000000-f3fff000 (prefetchable)
    Memory window 1: c4000000-c7fff000
    I/O window 0: 00005000-000050ff
    I/O window 1: 00005100-000051ff
    16-bit legacy interface ports at 0001

    15:00.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev
    04) (prog-if 10 [OHCI])
    Subsystem: Lenovo Device 20c7
    Flags: bus master, medium devsel, latency 32, IRQ 17
    Memory at f4301000 (32-bit, non-prefetchable) [size=2K]
    Capabilities: [dc] Power Management version 2
    Kernel driver in use: firewire_ohci

    15:00.2 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host
    Adapter (rev 21)
    Subsystem: Lenovo Device 20c8
    Flags: bus master, medium devsel, latency 32, IRQ 18
    Memory at f4301800 (32-bit, non-prefetchable) [size=256]
    Capabilities: [80] Power Management version 2
    Kernel driver in use: sdhci-pci

    15:00.3 System peripheral: Ricoh Co Ltd R5C843 MMC Host Controller (rev ff)
    (prog-if ff)
    !!! Unknown header type 7f
    Kernel driver in use: ricoh-mmc

    15:00.4 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter
    (rev 11)
    Subsystem: Lenovo ThinkPad T61
    Flags: bus master, medium devsel, latency 32, IRQ 11
    Memory at f4302000 (32-bit, non-prefetchable) [size=256]
    Capabilities: [80] Power Management version 2

    15:00.5 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 11)
    Subsystem: Lenovo Device 20cb
    Flags: bus master, medium devsel, latency 32, IRQ 11
    Memory at f4302400 (32-bit, non-prefetchable) [size=256]
    Capabilities: [80] Power Management version 2


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