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    SubjectRe: [2.6.33-rc1] System timer flooding bus on Lenovo Thinkpad W500 laptop in x86_64 - update
    Date
    On Wednesday 06 January 2010 14:28:04 Shawn Starr wrote:

    2.6.33-rc4 (Sun Jan 17 04:26:20 EST 2010 git snapshot) has different behavour.
    I cannot enable dynamic ticks. Must boot with nohz=off.

    The rescheduling interrupts no longer is increasing rapidly, seems to be a
    normal rescheduling period. However, enabling dynamic ticks will cause the
    system timer on irq 0 to fire too often and then cause the CPUs to reschedule
    interrupts too much.

    Powertop shows the following with A/C plugged in.

    Cn Avg residency P-states (frequencies)
    C0 (cpu running) ( 6.7%) 2.54 Ghz 0.7%
    polling 6.4ms (93.3%) 2.54 Ghz 0.4%
    C1 mwait 0.0ms ( 0.0%) 1.60 Ghz 0.2%
    C2 mwait 0.0ms ( 0.0%) 800 Mhz 98.7%
    C3 mwait 0.0ms ( 0.0%)

    CPU0 CPU1
    0: 46 1 IO-APIC-edge timer
    1: 268 258 IO-APIC-edge i8042
    8: 0 1 IO-APIC-edge rtc0
    9: 255 257 IO-APIC-fasteoi acpi
    12: 1433 1445 IO-APIC-edge i8042
    16: 0 0 IO-APIC-fasteoi uhci_hcd:usb6
    17: 5 2 IO-APIC-fasteoi firewire_ohci, uhci_hcd:usb7
    18: 0 0 IO-APIC-fasteoi mmc0, uhci_hcd:usb8
    19: 6851 6829 IO-APIC-fasteoi ehci_hcd:usb2
    20: 2119 2121 IO-APIC-fasteoi uhci_hcd:usb3
    21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
    22: 0 0 IO-APIC-fasteoi uhci_hcd:usb5
    23: 1 1 IO-APIC-fasteoi ehci_hcd:usb1
    28: 78 80 PCI-MSI-edge eth0
    29: 5304 5294 PCI-MSI-edge ahci
    30: 5587 5613 PCI-MSI-edge iwlagn
    31: 362 391 PCI-MSI-edge HDA Intel
    32: 1202 1152 PCI-MSI-edge i915
    NMI: 0 0 Non-maskable interrupts
    LOC: 85428 86232 Local timer interrupts
    SPU: 0 0 Spurious interrupts
    PMI: 0 0 Performance monitoring interrupts
    PND: 0 0 Performance pending work
    RES: 2018 1632 Rescheduling interrupts
    CAL: 70 67 Function call interrupts
    TLB: 102 199 TLB shootdowns
    TRM: 0 0 Thermal event interrupts
    THR: 0 0 Threshold APIC interrupts
    MCE: 0 0 Machine check exceptions
    MCP: 2 2 Machine check polls
    ERR: 1
    MIS: 0

    > 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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