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    SubjectIO-APIC timer 2.1/2.2
    My /proc/interrupts looks like this:

    CPU0 CPU1
    0: 529340 0 XT-PIC timer
    1: 4299 4348 IO-APIC-edge keyboard
    2: 0 0 XT-PIC cascade
    3: 482285 490657 IO-APIC-edge serial
    4: 39092 38549 IO-APIC-edge serial
    5: 2 0 IO-APIC-edge soundblaster
    8: 2 0 IO-APIC-edge rtc
    13: 1 0 XT-PIC fpu
    17: 9503 9528 IO-APIC-level aic7xxx
    18: 9858 9779 IO-APIC-level BusLogic BT-958
    19: 5399 5293 IO-APIC-level eth0
    NMI: 0
    ERR: 0

    (kernel boot message attached)

    The questions:
    - Is there anyway I can enable IO-APIC for timer?
    - Which one is faster/better IO-APIC-level or edge?

    The system is a Dell OptiPlex GxPro dual PPro 200MHz

    I am asking this question because there is another machine
    (ALR Quad6 dual PPro 200MHz) has IO-APIC-edge for timer...

    --
    +---| Netscape Communicator 4.x |---| Powered by Linux 2.1.x |---+
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    -----BEGIN GEEK CODE BLOCK-----
    Version: 3.1
    GCS/IT dx s: a- C+++ UL++++$ P- L+++(++++) E--- W++ N+++ o? K? w-- O-
    M- V-- PS+ PE Y-- PGP t+@ 5 X+ R- tv- b+ DI? D++(+) G e++ h* r+ y++
    ------END GEEK CODE BLOCK------Linux version 2.2.0-pre1 (root@krypton.mis.fsw.com.id) (gcc version pgcc-2.90.29 980515 (egcs-1.0.3 release)) #1 SMP Wed Dec 30 19:43:35 JAVT 1998
    Intel MultiProcessor Specification v1.4
    Virtual Wire compatibility mode.
    OEM ID: DELL Product ID: OPTIPLEXGX2 APIC at: 0xFEE00000
    Processor #0 Pentium(tm) Pro APIC version 17
    Processor #1 Pentium(tm) Pro APIC version 17
    I/O APIC #2 Version 17 at 0xFEC00000.
    Processors: 2
    mapped APIC to ffffe000 (fee00000)
    mapped IOAPIC to ffffd000 (fec00000)
    Detected 199984983 Hz processor.
    Console: colour VGA+ 80x34
    Calibrating delay loop... 199.07 BogoMIPS
    Memory: 62744k/65536k available (1020k kernel code, 420k reserved, 1032k data, 84k init)
    VFS: Diskquotas version dquot_6.4.0 initialized
    Checking 386/387 coupling... OK, FPU using exception 16 error reporting.
    Checking 'hlt' instruction... OK.
    POSIX conformance testing by UNIFIX
    mtrr: v1.26 (19981001) Richard Gooch (rgooch@atnf.csiro.au)
    per-CPU timeslice cutoff: 50.24 usecs.
    CPU0: Intel Pentium Pro stepping 07
    calibrating APIC timer ...
    ..... CPU clock speed is 199.4418 MHz.
    ..... APIC bus clock speed is 66.4803 MHz.
    Booting processor 1 eip 2000
    Calibrating delay loop... 199.07 BogoMIPS
    OK.
    CPU1: Intel Pentium Pro stepping 07
    Total of 2 processors activated (398.13 BogoMIPS).
    enabling symmetric IO mode... ...done.
    ENABLING IO-APIC IRQs
    init IO_APIC IRQs
    IO-APIC pin 0, 2, 20, 21, 22, 23 not connected.
    ...trying to set up timer as ExtINT... .. (found pin 0) ... works.
    number of MP IRQ sources: 36.
    number of IO-APIC registers: 24.
    testing the IO APIC.......................
    .... register #00: 00000000
    ....... : physical APIC id: 00
    .... register #01: 00170011
    ....... : max redirection entries: 0017
    ....... : IO APIC version: 0011
    .... register #02: 00000000
    ....... : arbitration: 00
    .... IRQ redirection table:
    NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:
    00 001 01 0 0 0 0 0 1 7 00
    01 000 00 0 0 0 0 0 1 1 59
    02 000 00 1 0 0 0 0 0 0 00
    03 000 00 0 0 0 0 0 1 1 61
    04 000 00 0 0 0 0 0 1 1 69
    05 000 00 0 0 0 0 0 1 1 71
    06 000 00 0 0 0 0 0 1 1 79
    07 000 00 0 0 0 0 0 1 1 81
    08 000 00 0 0 0 0 0 1 1 89
    09 000 00 0 0 0 0 0 1 1 91
    0a 000 00 0 0 0 0 0 1 1 99
    0b 000 00 0 0 0 0 0 1 1 A1
    0c 000 00 0 0 0 0 0 1 1 A9
    0d 000 00 1 0 0 0 0 0 0 00
    0e 000 00 0 0 0 0 0 1 1 B1
    0f 000 00 0 0 0 0 0 1 1 B9
    10 0FF 0F 1 1 0 1 0 1 1 C1
    11 0FF 0F 1 1 0 1 0 1 1 C9
    12 0FF 0F 1 1 0 1 0 1 1 D1
    13 0FF 0F 1 1 0 1 0 1 1 D9
    14 000 00 1 0 0 0 0 0 0 00
    15 000 00 1 0 0 0 0 0 0 00
    16 000 00 1 0 0 0 0 0 0 00
    17 000 00 1 0 0 0 0 0 0 00
    .................................... done.
    PCI: PCI BIOS revision 2.10 entry at 0xfc71e
    PCI: Using configuration type 1
    PCI: Probing PCI hardware
    PCI->APIC IRQ transform: (B0,I16,P0) -> 16
    PCI->APIC IRQ transform: (B0,I17,P0) -> 17
    PCI->APIC IRQ transform: (B1,I8,P0) -> 19
    PCI->APIC IRQ transform: (B1,I11,P0) -> 18
    PCI: 00:00 [8086/1237]: Passive release enable (00)
    Swansea University Computer Society NET3.039 for Linux 2.1
    NET3: Unix domain sockets 0.16 for Linux NET3.038.
    Swansea University Computer Society TCP/P for NET3.037
    IP Protocols: ICMP, UDP, TCP
    Swansea University Computer Society IPX 0.38 for NET3.037
    IPX Portions Copyright (c) 1995 Caldera, Inc.
    Initializing RT netlink socket
    Starting kswapd v 1.5
    Serial driver version 4.27 with no serial options enabled
    ttyS00 at 0x03f8 (irq = 4) is a 16550A
    ttyS01 at 0x02f8 (irq = 3) is a 16550A
    Real Time Clock Driver v1.09
    RAM disk driver initialized: 16 RAM disks of 4096K size
    md driver 0.36.6 MAX_MD_DEV=4, MAX_REAL=8
    scsi : 0 hosts.
    scsi : detected total.
    Partition check:
    RAMDISK: Compressed image found at block 0
    VFS: Mounted root (ext2 filesystem).
    (scsi0) <Adaptec AHA-2940A Ultra SCSI host adapter> found at PCI 17/0
    (scsi0) Narrow Channel, SCSI ID=7, 3/255 SCBs
    (scsi0) Downloading sequencer code... 419 instructions downloaded
    scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.6/3.2.4
    <Adaptec AHA-2940A Ultra SCSI host adapter>
    scsi : 1 host.
    Vendor: QUANTUM Model: FIREBALL1080S Rev: 1Q08
    Type: Direct-Access ANSI SCSI revision: 02
    Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
    (scsi0:0:0:0) Synchronous at 10.0 Mbyte/sec, offset 8.
    Vendor: MICROP Model: 4110-09NB_Nov18F Rev: TN0F
    Type: Direct-Access ANSI SCSI revision: 02
    Detected scsi disk sdb at scsi0, channel 0, id 1, lun 0
    (scsi0:0:1:0) Synchronous at 10.0 Mbyte/sec, offset 15.
    Vendor: MICROP Model: 4110-09NB_Nov18F Rev: TN0F
    Type: Direct-Access ANSI SCSI revision: 02
    Detected scsi disk sdc at scsi0, channel 0, id 2, lun 0
    (scsi0:0:2:0) Synchronous at 10.0 Mbyte/sec, offset 15.
    Vendor: MICROP Model: 4110-09NB_Nov18F Rev: TN0F
    Type: Direct-Access ANSI SCSI revision: 02
    Detected scsi disk sdd at scsi0, channel 0, id 3, lun 0
    (scsi0:0:3:0) Synchronous at 10.0 Mbyte/sec, offset 15.
    Vendor: PIONEER Model: CD-ROM DRM-604X Rev: 2405
    Type: CD-ROM ANSI SCSI revision: 02
    (scsi0:0:5:0) Synchronous at 5.0 Mbyte/sec, offset 15.
    Vendor: PIONEER Model: CD-ROM DRM-604X Rev: 2405
    Type: CD-ROM ANSI SCSI revision: 02
    Vendor: PIONEER Model: CD-ROM DRM-604X Rev: 2405
    Type: CD-ROM ANSI SCSI revision: 02
    Vendor: PIONEER Model: CD-ROM DRM-604X Rev: 2405
    Type: CD-ROM ANSI SCSI revision: 02
    Vendor: PIONEER Model: CD-ROM DRM-604X Rev: 2405
    Type: CD-ROM ANSI SCSI revision: 02
    Vendor: PIONEER Model: CD-ROM DRM-604X Rev: 2405
    Type: CD-ROM ANSI SCSI revision: 02
    Vendor: ARCHIVE Model: Python 04106-XXX Rev: 7270
    Type: Sequential-Access ANSI SCSI revision: 02
    (scsi0:0:6:0) Synchronous at 6.67 Mbyte/sec, offset 15.
    SCSI device sda: hdwr sector= 512 bytes. Sectors= 2134305 [1042 MB] [1.0 GB]
    sda: sda1 sda2 sda3
    SCSI device sdb: hdwr sector= 512 bytes. Sectors= 2053880 [1002 MB] [1.0 GB]
    sdb: sdb1 sdb2
    SCSI device sdc: hdwr sector= 512 bytes. Sectors= 2053880 [1002 MB] [1.0 GB]
    sdc: sdc1 sdc2
    SCSI device sdd: hdwr sector= 512 bytes. Sectors= 2053880 [1002 MB] [1.0 GB]
    sdd: sdd1 sdd2
    scsi: ***** BusLogic SCSI Driver Version 2.1.15 of 17 August 1998 *****
    scsi: Copyright 1995-1998 by Leonard N. Zubkoff <lnz@dandelion.com>
    scsi1: Configuring BusLogic Model BT-958 PCI Wide Ultra SCSI Host Adapter
    scsi1: Firmware Version: 5.06I, I/O Address: 0xECDC, IRQ Channel: 18/Level
    scsi1: PCI Bus: 1, Device: 11, Address: 0xFCFFF000, Host Adapter SCSI ID: 7
    scsi1: Parity Checking: Enabled, Extended Translation: Disabled
    scsi1: Synchronous Negotiation: Fast, Wide Negotiation: Enabled
    scsi1: Disconnect/Reconnect: Enabled, Tagged Queuing: Enabled
    scsi1: Scatter/Gather Limit: 128 of 8192 segments, Mailboxes: 211
    scsi1: Driver Queue Depth: 211, Hos Adapter Queue Depth: 192
    scsi1: Tagged Queue Depth: Automatic, Untagged Queue Depth: 3
    scsi1: Error Recovery Strategy: Default, SCSI Bus Reset: Enabled
    scsi1: SCSI Bus Termination: Both Enabled, SCAM: Disabled
    scsi1: *** BusLogic BT-958 Initialized Successfully ***
    scsi1 : BusLogic BT-958
    scsi : 2 hosts.
    Vendor: SEAGATE Model: ST15150W Rev: 0022
    Type: Direct-Access ANSI SCSI revision: 02
    Detected scsi disk sde at scsi1, channel 0, id 0, lun 0
    scsi1: Target 0: Queue Depth 28, Wide Synchronous at 20.0 MB/sec, offset 15
    SCSI device sde: hdwr sector= 512 bytes. Sectors= 8388315 [4095 MB] [4.1 GB]
    sde: sde1 sde2 sde3 sde4
    VFS: Mounted root (ext2 filesystem) readonly.
    change_root: old root has d_count=1
    Trying to unmount old root ... okay
    Freeing unused kernel memory: 84k freed
    Adding Swap: 122876k swap-space (priority -1)
    Soundblaster audio driver Copyright (C) by Hannu Savolainen 1993-1996
    SB 4.13 detected OK (220)
    YM3812 and OPL-3 driver Copyright (C) by Hannu Savolainen, Rob Hooft 1993-1996
    REGISTER_DEV sdb1 to md0 done
    REGISTER_DEV sdc1 to md0 done
    REGISTER_DEV sdd1 to md0 done
    raid0 personality registered
    raid0 : Allocating 8 bytes for hash.
    REGISTER_DEV sdb2 to md1 done
    REGISTER_DEV sdc2 to md1 done
    REGISTER_DEV sdd2 to md1 done
    raid0 : Allocating 8 bytes for hash.
    scsi1: Tagged Queuing now active for Target 0
    st: bufsize 32768, wrt 30720, max buffers 4, s/g segs 16.
    Detected scsi tape st0 at scsi0, channel 0, id 6, lun 0
    3c59x.c:v0.99E 5/12/98 Donald Becker http://cesdis.gsfc.nasa.gov/linux/drivers/vortex.html
    eth0: 3Com 3c590 Vortex 10Mbps at 0xece0, 00:c0:4f:c3:25:a6, IRQ 19
    32K byte-wide RAM 1:1 Rx:Tx split, 10baseT interface.
    eth0: Overriding PCI latency timer (CFLT) setting of 32, new value is 248.
    diald uses obsolete (PF_INET,SOCK_PACKET)
    CSLIP: code copyright 1989 Regents of the University of California
    SLIP: version 0.8.4-NET3.019-NEWTTY-MODULAR (dynamic channels, max=256).
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