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    Subject2.6.15: no more interrupt load balancing
    From
    Hello,

    2.6.13 was Nok,
    2.6.14 was Ok,
    2.6.15 Nok :
    efuste@rafale:~$ cat /proc/interrupts
    CPU0 CPU1
    0: 1046433 211 IO-APIC-edge timer
    1: 2778 9 IO-APIC-edge i8042
    2: 0 0 XT-PIC cascade
    3: 17 0 IO-APIC-edge serial
    5: 0 0 IO-APIC-edge SoundBlaster
    7: 1 2 IO-APIC-edge parport0
    8: 4 0 IO-APIC-edge rtc
    12: 116647 3 IO-APIC-edge i8042
    17: 170055 0 IO-APIC-level eth0
    19: 216141 1 IO-APIC-level aic7xxx, uhci_hcd:usb1
    NMI: 0 0
    LOC: 1046486 1046485
    ERR: 0
    MIS: 0

    boot log:

    Linux version 2.6.15 (Version: manu.1) (root@excalibur) (gcc
    version 4.0.3 20060104 (prerelease) (Debian 4.0.2-6)) #3 SMP
    Thu Jan 12 15:22:26 CET 2006
    BIOS-provided physical RAM map:
    BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
    BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
    BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
    BIOS-e820: 0000000000100000 - 0000000020000000 (usable)
    BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
    BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
    BIOS-e820: 00000000ffff0000 - 0000000100000000 (reserved)
    512MB LOWMEM available.
    found SMP MP-table at 000f6960
    On node 0 totalpages: 131072
    DMA zone: 4096 pages, LIFO batch:0
    DMA32 zone: 0 pages, LIFO batch:0
    Normal zone: 126976 pages, LIFO batch:31
    HighMem zone: 0 pages, LIFO batch:0
    DMI 2.0 present.
    Intel MultiProcessor Specification v1.4
    Virtual Wire compatibility mode.
    OEM ID: OEM00000 Product ID: PROD00000000 APIC at: 0xFEE00000
    Processor #0 5:4 APIC version 16
    Processor #1 5:4 APIC version 16
    I/O APIC #2 Version 17 at 0xFEC00000.
    Enabling APIC mode: Flat. Using 1 I/O APICs
    Processors: 2
    Allocating PCI resources starting at 30000000 (gap:
    20000000:dec00000)
    Built 1 zonelists
    Kernel command line: auto BOOT_IMAGE=Linux ro root=802
    mapped APIC to ffffd000 (fee00000)
    mapped IOAPIC to ffffc000 (fec00000)
    Initializing CPU#0
    CPU 0 irqstacks, hard=c02f0000 soft=c02ee000
    PID hash table entries: 4096 (order: 12, 65536 bytes)
    Detected 232.699 MHz processor.
    Using tsc for high-res timesource
    Console: colour VGA+ 80x25
    Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
    Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
    Memory: 515484k/524288k available (1312k kernel code, 8304k
    reserved, 475k data, 160k init, 0k highmem)
    Checking if this processor honours the WP bit even in
    supervisor mode... Ok.
    Calibrating delay using timer specific routine.. 466.34
    BogoMIPS (lpj=932696)
    Security Framework v1.0.0 initialized
    SELinux: Disabled at boot.
    Capability LSM initialized
    Mount-cache hash table entries: 512
    CPU: After generic identify, caps: 008003bf 00000000 00000000
    00000000 00000000 00000000 00000000
    CPU: After vendor identify, caps: 008003bf 00000000 00000000
    00000000 00000000 00000000 00000000
    Intel Pentium with F0 0F bug - workaround enabled.
    CPU: After all inits, caps: 008003bf 00000000 00000000
    00000000 00000000 00000000 00000000
    mtrr: v2.0 (20020519)
    Checking 'hlt' instruction... OK.
    CPU0: Intel Pentium MMX stepping 03
    Booting processor 1/1 eip 2000
    CPU 1 irqstacks, hard=c02f1000 soft=c02ef000
    Initializing CPU#1
    Calibrating delay using timer specific routine.. 465.40
    BogoMIPS (lpj=930806)
    CPU: After generic identify, caps: 008003bf 00000000 00000000
    00000000 00000000 00000000 00000000
    CPU: After vendor identify, caps: 008003bf 00000000 00000000
    00000000 00000000 00000000 00000000
    CPU: After all inits, caps: 008003bf 00000000 00000000
    00000000 00000000 00000000 00000000
    CPU1: Intel Pentium MMX stepping 03
    Total of 2 processors activated (931.75 BogoMIPS).
    ExtINT not setup in hardware but reported by MP table
    ENABLING IO-APIC IRQs
    ..TIMER: vector=0x31 apic1=0 pin1=2 apic2=0 pin2=0
    checking TSC synchronization across 2 CPUs: passed.
    Brought up 2 CPUs
    checking if image is initramfs... it is
    Freeing initrd memory: 1121k freed
    NET: Registered protocol family 16
    PCI: PCI BIOS revision 2.10 entry at 0xf0440, last bus=0
    PCI: Using configuration type 1
    Linux Plug and Play Support v0.97 (c) Adam Belay
    PnPBIOS: Scanning system for PnP BIOS support...
    PnPBIOS: Found PnP BIOS installation structure at 0xc00fcec0
    PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0xcef0, dseg 0xf0000
    PnPBIOS: 14 nodes reported by PnP BIOS; 14 recorded by driver
    PCI: Probing PCI hardware
    PCI: Probing PCI hardware (bus 00)
    Boot video device is 0000:00:0a.0
    PCI: Using IRQ router PIIX/ICH [8086/7000] at 0000:00:01.0
    PCI->APIC IRQ transform: 0000:00:01.2[D] -> IRQ 19
    PCI->APIC IRQ transform: 0000:00:0a.0[A] -> IRQ 18
    PCI->APIC IRQ transform: 0000:00:0b.0[A] -> IRQ 17
    PCI->APIC IRQ transform: 0000:00:0c.0[A] -> IRQ 16
    PCI->APIC IRQ transform: 0000:00:0d.0[A] -> IRQ 19
    audit: initializing netlink socket (disabled)
    audit(1137539311.901:1): initialized
    VFS: Disk quotas dquot_6.5.1
    Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
    Initializing Cryptographic API
    io scheduler noop registered
    io scheduler anticipatory registered
    io scheduler deadline registered
    io scheduler cfq registered
    PIIX3: Enabling ISA and USB passive release and delayed
    transaction.
    PIIX3: Enabling north bridge retry enable bit.
    82439HX: Enabling north bridge delayed transaction.
    Good PIIX3 revision: ISA DMA hang workarounds not need.
    isapnp: Scanning for PnP cards...
    isapnp: No Plug & Play device found
    PNP: PS/2 Controller [PNP0303,PNP0f13] at 0x60,0x64 irq 1,12
    serio: i8042 AUX port at 0x60,0x64 irq 12
    serio: i8042 KBD port at 0x60,0x64 irq 1
    Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ
    sharing enabled
    serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
    serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
    00:02: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
    00:03: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
    RAMDISK driver initialized: 16 RAM disks of 8192K size 1024
    blocksize
    NET: Registered protocol family 2
    input: AT Translated Set 2 keyboard as /class/input/input0
    IP route cache hash table entries: 32768 (order: 5, 131072 bytes)
    TCP established hash table entries: 131072 (order: 8, 1048576
    bytes)
    TCP bind hash table entries: 65536 (order: 7, 524288 bytes)
    TCP: Hash tables configured (established 131072 bind 65536)
    TCP reno registered
    TCP bic registered
    NET: Registered protocol family 1
    NET: Registered protocol family 17
    NET: Registered protocol family 8
    NET: Registered protocol family 20
    Starting balanced_irq
    Using IPI Shortcut mode
    Freeing unused kernel memory: 160k freed
    mice: PS/2 mouse device common for all mice
    SCSI subsystem initialized
    scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 7.0
    <Adaptec 2940 Ultra2 SCSI adapter>
    aic7890/91: Ultra2 Wide Channel A, SCSI Id=7, 32/253 SCBs

    Vendor: IBM Model: DMVS18V Rev: 02B0
    Type: Direct-Access ANSI SCSI
    revision: 03
    scsi0:A:0:0: Tagged Queuing enabled. Depth 8
    target0:0:0: Beginning Domain Validation
    target0:0:0: wide asynchronous.
    target0:0:0: FAST-40 WIDE SCSI 80.0 MB/s ST (25 ns, offset 31)
    target0:0:0: Domain Validation skipping write tests
    target0:0:0: Ending Domain Validation
    Vendor: YAMAHA Model: CRW6416S Rev: 1.0d
    Type: CD-ROM ANSI SCSI
    revision: 02
    target0:0:3: Beginning Domain Validation
    target0:0:3: FAST-10 SCSI 10.0 MB/s ST (100 ns, offset 15)
    target0:0:3: Domain Validation skipping write tests
    target0:0:3: Ending Domain Validation
    Vendor: TOSHIBA Model: CD-ROM XM-3501TA Rev: 1875
    Type: CD-ROM ANSI SCSI
    revision: 02
    target0:0:4: Beginning Domain Validation
    target0:0:4: Domain Validation skipping write tests
    target0:0:4: Ending Domain Validation
    SCSI device sda: 35843670 512-byte hdwr sectors (18352 MB)
    SCSI device sda: drive cache: write back
    SCSI device sda: 35843670 512-byte hdwr sectors (18352 MB)
    SCSI device sda: drive cache: write back
    sda: sda1 sda2 sda3 sda4
    sd 0:0:0:0: Attached scsi disk sda
    kjournald starting. Commit interval 5 seconds
    EXT3-fs: mounted filesystem with ordered data mode.
    usbcore: registered new driver usbfs
    usbcore: registered new driver hub
    pcnet32.c:v1.31c 01.Nov.2005 tsbogend@alpha.franken.de
    PCI: Setting latency timer of device 0000:00:0b.0 to 64
    pcnet32: PCnet/PCI 79C970 at 0xe000, 10 00 5a 5b 55 97
    assigned IRQ 17.
    eth0: registered as PCnet/PCI 79C970
    pcnet32: 1 cards_found.
    USB Universal Host Controller Interface driver v2.3
    uhci_hcd 0000:00:01.2: UHCI Host Controller
    uhci_hcd 0000:00:01.2: new USB bus registered, assigned bus
    number 1
    uhci_hcd 0000:00:01.2: irq 19, io base 0x0000e400
    hub 1-0:1.0: USB hub found
    hub 1-0:1.0: 2 ports detected
    Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
    ide: Assuming 33MHz system bus speed for PIO modes; override
    with idebus=xx
    PIIX3: IDE controller at PCI slot 0000:00:01.1
    PIIX3: chipset revision 0
    PIIX3: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xe800-0xe807, BIOS settings: hda:pio, hdb:pio
    ide1: BM-DMA at 0xe808-0xe80f, BIOS settings: hdc:pio, hdd:pio
    Probing IDE interface ide0...
    Probing IDE interface ide1...
    Floppy drive(s): fd0 is 2.88M AMI BIOS, fd1 is 1.44M
    input: PC Speaker as /class/input/input1
    Real Time Clock Driver v1.12
    parport: PnPBIOS parport detected.
    parport0: PC-style at 0x378 (0x778), irq 7, dma 3
    [PCSPP,TRISTATE,COMPAT,EPP,ECP,DMA]
    FDC 0 is a post-1991 82077
    input: ImExPS/2 Generic Explorer Mouse as /class/input/input2
    sr0: scsi3-mmc drive: 6x/6x writer cd/rw xa/form2 cdda tray
    Uniform CD-ROM driver Revision: 3.20
    sr 0:0:3:0: Attached scsi CD-ROM sr0
    sr1: scsi-1 drive
    sr 0:0:4:0: Attached scsi CD-ROM sr1
    sd 0:0:0:0: Attached scsi generic sg0 type 0
    sr 0:0:3:0: Attached scsi generic sg1 type 5
    sr 0:0:4:0: Attached scsi generic sg2 type 5
    EXT3 FS on sda2, internal journal
    RocketPort device driver module, version 2.09, 12-June-2003
    RocketPort ISA card #0 found at 0x180 - 1 AIOPs
    Installing RocketPort ISA, creating /dev/ttyR0 - 7
    CSLIP: code copyright 1989 Regents of the University of California
    PPP generic driver version 2.4.2
    NET: Registered protocol family 24
    Probing IDE interface ide0...
    Probing IDE interface ide1...
    irda_init()
    NET: Registered protocol family 23
    IrCOMM protocol (Dag Brattli)
    device-mapper: 4.4.0-ioctl (2005-01-12) initialised:
    dm-devel@redhat.com
    kjournald starting. Commit interval 5 seconds
    EXT3 FS on sda3, internal journal
    EXT3-fs: mounted filesystem with writeback data mode.
    Adding 522072k swap on /dev/sda1. Priority:-1 extents:1
    across:522072k
    NET: Registered protocol family 15
    NET: Registered protocol family 10
    lo: Disabled Privacy Extensions
    IPv6 over IPv4 tunneling driver
    lp0: using parport0 (interrupt-driven).
    eth0: no IPv6 routers present
    cdrom: This disc doesn't have any tracks I recognize!
    sirdev_get_instance - ttyS1
    irtty_open - ttyS1: irda line discipline opened
    irda_register_dongle : registering dongle "Tekram IR-210B" (0).
    irlap_change_speed(), setting speed to 9600
    pktcdvd: v0.2.0a 2004-07-14 Jens Axboe (axboe@suse.de) and
    petero2@telia.com
    cdrom: This disc doesn't have any tracks I recognize!
    pktcdvd: writer pktcdvd0 mapped to sr0
    pktcdvd: pkt_get_last_written failed
    ircomm_tty_attach_cable()
    ircomm_tty_ias_register()
    Linux agpgart interface v0.101 (c) Dave Jones
    [drm] Initialized drm 1.0.0 20040925
    [drm:drm_fill_in_dev] *ERROR* Cannot initialize the agpgart
    module.
    DRM: Fill_in_dev failed.

    Thanks,
    Emmanuel.


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