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    Subject2.6.21-rt9 - IRQ23 consuming a steady 2.7% of CPU
    Hi,
    I've been running 2.6.21.3-rt9 and a couple of -rc predecessors for
    a few weeks and this minor problem has been consistent on all versions
    I've run. On this AMD64 machine I still have 2.6.17-rt8 and 2.6.18-rt7
    and neither of those versions cause the problem. I am currently
    building the matching vanilla kernel as well as the 2.6.22-rc3 kernel
    to see if it's in those versions.

    I see today that the same problem has been reported by another
    AMD64 user on a distribution mail list so I think the problem isn't
    specific to my hardware anymore. I had previously thought so and
    therefore didn't report this right away thinking I'd do more debug.

    http://search.gmane.org/?query=IRQ+23&group=gmane.linux.distributions.64studio

    Since my IRQ23 is shared on my machine by Ethernet and USB I have
    tried detaching all network cables and turning off all USB devices but
    the problem persists.

    I'll report back what happens with the vanilla-kernels. If a binary
    regression search is required of everything between 2.6.18 and 2.6.21
    to look for where the problem crept in that will take some time so any
    guidance on where to start would be helpful.

    If more info is desired please don't hesitate to ask.

    Cheers,
    Mark


    mark@lightning ~ $ uname -a
    Linux lightning 2.6.21.3-rt9 #1 PREEMPT RT Sat Jun 9 09:49:32 PDT 2007
    x86_64 AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux
    mark@lightning ~ $


    mark@lightning ~ $ top

    top - 10:02:17 up 3 min, 2 users, load average: 0.00, 0.00, 0.00
    Tasks: 88 total, 2 running, 86 sleeping, 0 stopped, 0 zombie
    Cpu(s): 1.3%us, 0.0%sy, 0.0%ni, 95.7%id, 0.0%wa, 3.0%hi, 0.0%si, 0.0%st
    Mem: 1026612k total, 190316k used, 836296k free, 8124k buffers
    Swap: 2008084k total, 0k used, 2008084k free, 74616k cached

    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
    947 root -76 -5 0 0 0 S 2.7 0.0 0:05.58 IRQ-23
    9533 root 15 0 324m 13m 7420 S 1.3 1.4 0:03.24 X
    1 root 15 0 2668 588 500 S 0.0 0.1 0:00.27 init
    2 root RT 0 0 0 0 S 0.0 0.0 0:00.00 posix_cpu_timer
    3 root -51 0 0 0 0 S 0.0 0.0 0:00.00 softirq-high/0



    mark@lightning ~ $ cat /proc/interrupts
    CPU0
    0: 212 IO-APIC-edge timer
    1: 296 IO-APIC-edge i8042
    6: 3 IO-APIC-edge floppy
    7: 0 IO-APIC-edge lpptest
    8: 0 IO-APIC-edge rtc
    9: 0 IO-APIC-fasteoi acpi
    12: 8690 IO-APIC-edge i8042
    14: 62 IO-APIC-edge ide0
    16: 0 IO-APIC-fasteoi hdsp
    18: 14496 IO-APIC-fasteoi ohci1394, radeon@pci:0000:01:00.0
    20: 2 IO-APIC-fasteoi ehci_hcd:usb1
    21: 7724 IO-APIC-fasteoi libata
    22: 0 IO-APIC-fasteoi libata, NVidia CK804
    23: 1739277 IO-APIC-fasteoi ohci_hcd:usb2, eth0
    NMI: 0
    LOC: 59688
    ERR: 0
    mark@lightning ~ $


    mark@lightning ~ $ uname -a
    Linux lightning 2.6.18-rt7 #4 PREEMPT Sun Apr 8 17:32:31 PDT 2007
    x86_64 AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux
    mark@lightning ~ $


    mark@lightning ~ $ top

    top - 10:09:51 up 1 min, 2 users, load average: 0.00, 0.00, 0.00
    Tasks: 83 total, 1 running, 82 sleeping, 0 stopped, 0 zombie
    Cpu(s): 1.7%us, 0.3%sy, 0.0%ni, 95.4%id, 2.6%wa, 0.0%hi, 0.0%si, 0.0%st
    Mem: 1026840k total, 185688k used, 841152k free, 7904k buffers
    Swap: 2008084k total, 0k used, 2008084k free, 74172k cached

    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
    9024 root 15 0 324m 13m 7072 S 1.7 1.3 0:01.00 X
    7 root -2 0 0 0 0 S 0.3 0.0 0:01.02 softirq-block/0
    9912 mark 15 0 10600 1304 960 R 0.3 0.1 0:00.01 top
    1 root 15 0 2676 588 500 S 0.0 0.1 0:00.31 init
    2 root RT 0 0 0 0 S 0.0 0.0 0:00.00 posix_cpu_timer
    3 root -2 0 0 0 0 S 0.0 0.0 0:00.00 softirq-high/0


    lightning ~ # lspci
    00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller (rev a3)
    00:01.0 ISA bridge: nVidia Corporation CK804 ISA Bridge (rev a3)
    00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
    00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2)
    00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3)
    00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97
    Audio Controller (rev a2)
    00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2)
    00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3)
    00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller (rev f3)
    00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev a2)
    00:0a.0 Bridge: nVidia Corporation CK804 Ethernet Controller (rev a3)
    00:0b.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
    00:0c.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
    00:0d.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
    00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
    00:18.0 Host bridge: Advanced Micro Devices [AMD] K8
    [Athlon64/Opteron] HyperTransport Technology Configuration
    00:18.1 Host bridge: Advanced Micro Devices [AMD] K8
    [Athlon64/Opteron] Address Map
    00:18.2 Host bridge: Advanced Micro Devices [AMD] K8
    [Athlon64/Opteron] DRAM Controller
    00:18.3 Host bridge: Advanced Micro Devices [AMD] K8
    [Athlon64/Opteron] Miscellaneous Control
    01:00.0 VGA compatible controller: ATI Technologies Inc RV370 5B60
    [Radeon X300 (PCIE)]
    01:00.1 Display controller: ATI Technologies Inc RV370 [Radeon X300SE]
    05:06.0 Multimedia audio controller: Xilinx Corporation RME Hammerfall
    DSP (rev 68)
    05:08.0 FireWire (IEEE 1394): Texas Instruments TSB82AA2 IEEE-1394b
    Link Layer Controller (rev 01)
    lightning ~ #

    lightning ~ # lsmod
    Module Size Used by
    it87 22032 0
    hwmon_vid 2880 1 it87
    i2c_isa 6144 1 it87
    eeprom 7248 0
    snd_seq_midi 7296 0
    snd_pcm_oss 40160 0
    snd_mixer_oss 15168 1 snd_pcm_oss
    snd_seq_dummy 3460 0
    snd_seq_oss 29696 0
    snd_seq_midi_event 7040 2 snd_seq_midi,snd_seq_oss
    snd_seq 48000 6
    snd_seq_midi,snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
    realtime 9416 0
    sbp2 22084 0
    radeon 115488 2
    drm 84392 3 radeon
    snd_hdsp 47812 0
    snd_rawmidi 21216 2 snd_seq_midi,snd_hdsp
    snd_seq_device 7252 5
    snd_seq_midi,snd_seq_dummy,snd_seq_oss,snd_seq,snd_rawmidi
    snd_hwdep 8456 1 snd_hdsp
    ohci1394 31368 0
    ieee1394 91024 2 sbp2,ohci1394
    snd_intel8x0 32296 1
    snd_ac97_codec 107288 1 snd_intel8x0
    ac97_bus 3712 1 snd_ac97_codec
    snd_pcm 74440 4 snd_pcm_oss,snd_hdsp,snd_intel8x0,snd_ac97_codec
    snd_timer 20424 2 snd_seq,snd_pcm
    snd 52264 14
    snd_pcm_oss,snd_mixer_oss,snd_seq_oss,snd_seq,snd_hdsp,snd_rawmidi,snd_seq_device,snd_hwdep,snd_intel8x0,snd_ac97_codec,snd_pcm,snd_timer
    snd_page_alloc 8208 3 snd_hdsp,snd_intel8x0,snd_pcm
    k8temp 5888 0
    i2c_nforce2 6016 0
    i2c_core 21056 4 it87,i2c_isa,eeprom,i2c_nforce2
    lightning ~ #
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