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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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