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    SubjectRe: [2.6.33-rc1] System timer flooding bus on Lenovo Thinkpad W500 laptop in x86_64 - continues in -rc3
    Date
    On December 21, 2009 01:12:52 pm Shawn Starr wrote:
    > 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.

    This is still happening in 2.6.33-rc2, 2.6.33-rc3 (just built). Setting
    nohz=off stops the system timer from incrementing so rapidly.

    0: 47 1 IO-APIC-edge timer

    This issue is being tracked from
    http://bugzilla.kernel.org/show_bug.cgi?id=14859

    However, there are a high number of Rescheduling interrupts occurring. There
    are still generic IRQ issues.

    If the timer/irq folks have any patches for me to test, I'd be glad to try
    them.

    Thanks,
    Shawn.

    >
    > 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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